2. Anil K. Chopra

Anil K. Chopra

Slug
chopra
Type
Emeritus
Photo
Chopra headshot
Headshot
Anil K. Chopra
First Name
Anil
Middle Name
K.
Last Name
Chopra
Email
chopra@berkeley.edu
Office
782 Davis Hall
Office Phone
(510) 642-1292
Office Fax
(510) 643-5264
Programs
Structural Engineering, Mechanics and Materials
Titles
Chancellor's Professor
Horace, Dorothy, and Katherine Johnson Professor of Engineering Emeritus
Biography

Anil K. Chopra received his Bachelor of Science degree in Civil Engineering from Banaras Hindu University, India, in 1960, the Master of Science degree from the University of California, Berkeley, in 1963, and the Doctor of Philosophy degree, also from Berkeley, in 1966.

He joined the faculty at the University of California, Berkeley, in 1969 where he has served as Vice Chair (1980–83) and Chair (1991–93, 1994–97) of the Structural Engineering, Mechanics and Materials program in the Department of Civil and Environmental Engineering. He has been responsible for the development and teaching of courses in structural engineering, structural dynamics, and earthquake engineering.

His research activities have included studies of structural dynamics, various problems in earthquake analysis and design of buildings, dynamic soil structure interaction, dynamic fluid structure interaction, and earthquake analysis and design of concrete dams. He has authored more than 380 published papers on this work, a monograph, Earthquake Dynamics of Structures, A Primer, 2005, and a textbook, Dynamics of Structures: Theory and Applications to Earthquake Engineering, 1995, 2001, 2007, 2012, and 2017. The S.I. edition of this book was published in 2015. The book has been translated into Japanese, Chinese, Korean, Greek, Turkish, Spanish, and Farsi.

He serves as a consultant on earthquake engineering problems to numerous governmental and private organizations in several countries. He has served several professional societies in various positions: Chairman (1986) of the Engineering Mechanics Division Executive Committee, and Chairman (1991) of the Structural Division Executive Committee, American Society of Civil Engineers; Board of Directors of the Earthquake Engineering Research Institute (1990–93), Structural Engineers Association of Northern California (1987–89), the Seismological Society of America (1982–83), and the Applied Technology Council (1972–74); and Chairman of the National Research Council Committee on Natural Disasters (1982–83). Currently, he serves as Executive Editor of Earthquake Engineering and Structural Dynamics, the journal of the International Association for Earthquake Engineering.

He has received the following honors: the University Gold Medal (1960) and the Distinguished Alumnus Award (1980) from Banaras Hindu University; the Ernest E. Howard Award (1998), the Nathan M. Newmark Medal (1993), the Norman Medal four times (2013, 2001, 1991, and 1979), the Raymond C. Reese Research Prize (1989), and the Walter L. Huber Research Prize (1975), all of the American Society of Civil Engineers; the Housner Medal (2002) from the Earthquake Engineering Research Institute; and the AT&T Foundation Award of the American Society for Engineering Education (1987). At the University of California at Berkeley he was appointed Miller Research Professor for the Fall Semester, 1990, and for the 2003‑2004 academic year, was named to the Horace, Dorothy, and Katherine Johnson Chair in Engineering in 1992, and received the Distinguished Teaching Award in 1999. He was elected to the National Academy of Engineering in 1984, as an Honorary Member of the International Association for Earthquake Engineering in 2004, Fellow of the Structural Engineers Association of California (2004), and an Honorary Member of the Structural Engineers Association Northern California (2010). He received the Doctor Honnoris Causa from the Technical University of Engineering, Bucharest, Romania in 2007, and the Honorary Professor title from Harbin Institute of Technology, China, in 2009. In 2009 the magazine International Water, Power & Dam Construction listed him among the “60 most influential people in the hydropower and dams industry” who “helped shape the course of the global hydro and dams business over the last 60 years.” In 2011 the same magazine listed him among “Influencing Engineering…the 20 people who have made the biggest difference in the dam engineering sector over the past ten years.” In 2012 he received the “National Award for Significant Contributions in Science and Technology,” from SENACYT: La Secretaria Nacional de Ciencia, Technologia & Innovacion, Panama. In 2013 he was honored by the American Society of Civil Engineers twice; he received the Norman Medal and was elected as a Fellow in the Engineering Mechanics Institute. In 2014, he was elected as an Honorary Fellow by the Indian Society for Earthquake Technology. He was awarded the Berkeley Citation, University of California, Berkeley, 2016, “for distinguished achievement and for notable service to the University.” In March 2017 he was elected as an Honorary Member of the Earthquake Engineering Research Institute in recognition of his sustained and outstanding contributions in the field of earthquake engineering. He presented the Newmark Distinguished Lecture for 2017 at the University of Illinois at Urbana-Champaign. In 2017 he was elected to the Academy of Civil and Environmental Engineering Distinguished Alumni, the University of California, Berkeley. Finally he received The Nigel Priestley Prize (formerly the Rose School Prize), 2018, Pavia, Italy, to honor individuals for creativity, innovation, research, and professional achievements and excellence in education in the field of earthquake engineering and engineering seismology.

Education

Ph.D. - Civil Engineering, University of California at Berkeley, 1966
M.S. - Civil Engineering, University of California at Berkeley, 1963
B.Sc. - Civil Engineering, Banaras Hindu University, India, 1960

Research Overview

DYNAMICS OF STRUCTURES, EARTHQUAKE ENGINEERING

  • Selection and Scaling of Ground Motions for Nonlinear Response History Analysis of Structures
  • Earthquake Analysis, Design, and Safety Evaluation of Concrete Arch Dams
  • Modeling Viscous Damping in Nonlinear Response History Analysis of Buildings
Research

MODELING VISCOUS DAMPING IN NONLINEAR RESPONSE HISTORY ANALYSIS OF BUILDINGS

The Rayleigh damping model, which is pervasive in nonlinear response history analysis (RHA) of buildings, is shown to develop “spurious” damping forces and lead to inaccurate response results. We prove that a viscous damping matrix constructed by superposition of modal damping matrices—irrespective of the number of modes included or values assigned to modal damping ratios—completely eliminates the “spurious” damping forces. This is the damping model recommended for nonlinear RHA.

Replacing the stiffness proportional part of Rayleigh damping by the tangent stiffness matrix is shown to improve response results. However, this model is not recommended because it lacks a physical basis and has conceptual implications that are troubling: hysteresis in damping force—velocity relationship and negative damping at large displacements. Furthermore, the model conflicts with the constant-damping model that has been the basis for fundamental concepts and accumulated experience about the inelastic response of structures.

With a distributed plasticity model, the structural response is not sensitive to the damping model; even the Rayleigh damping model leads to acceptable results. This perspective on damping provides yet another reason to employ the superior distributed plasticity models in nonlinear RHA. OpenSees software has been extended to include a damping matrix defined as the superposition of modal damping matrices. Although this model leads to a full populated damping matrix, the additional computational demands are demonstrated to be minimal.

Collaborators:

  • Dr. Frank McKenna, PEER

Publications:

  • A. K. Chopra and F. McKenna, “Modeling Viscous Damping in Nonlinear Response History Analysis of Buildings,” Proceedings, 16th World Conference on Earthquake Engineering, Santiago, Chile, January 2017 .
  • A. K. Chopra, and F. McKenna, “Author’s Reply to John Hall’s Discussion (EQE-16-0008) to Chopra and McKenna’s Paper, ‘Modeling Viscous Damping in Nonlinear Response History Analysis of Buildings for Earthquake Excitation,’” Earthquake Engineering and Structural Dynamics, Vol. 45, No. 13, pp. 2235–2238, October 2016 .
  • A. K. Chopra, and F. McKenna, "Modeling Viscous Damping in Nonlinear Response History Analysis of Buildings for Earthquake Excitation," Earthquake Engineering and Structural Dynamics, Vol. 45, No. 2, pp. 193–211, February 2016.

 

SELECTION AND SCALING OF GROUND MOTIONS FOR NONLINEAR RESPONSE HISTORY ANALYSIS OF BUILDINGS

The earthquake engineering profession has been moving away from traditional code procedures to performance-based procedures for evaluating existing buildings and proposed designs of new buildings. Although nonlinear static (or pushover) analysis continues to be used for estimating seismic demands, nonlinear response history analysis (RHA) is now being increasingly employed. In the latter approach, engineering demand parameters (EDPs)—floor displacements, story drifts, member forces, member deformations, etc.—are determined by nonlinear RHA of a computer model of the building for an ensemble of multi-component ground motions. Fraught with several challenging issues, selection and scaling of ground motions necessary for nonlinear RHA remains a subject of much research in recent years.

Most existing procedures to modify or scale ground motion records fall into one of two categories: spectrum matching and amplitude scaling. Both classes of procedures—spectral matching and amplitude scaling—are essentially limited to one component of ground motion, whereas ground motion is three dimensional, and three components (two horizontal and one vertical) are required in dynamic analysis of complex structures.

In spectrum matching procedures, wavelets are added to recorded motion such that the response spectrum for the modified ground motion matches closely the target spectrum. Modifying the time variation of the recorded ground motion distorts these records, making them inconsistent relative to the physical characteristics of the earthquake source. Thus, this approach is fundamentally inconsistent relative to the science of seismology.

The objective of amplitude scaling procedures is to determine scale factors for a small number of records such that the scaled records provide an accurate estimate of the benchmark structural response. Amplitude scaling of ground motions, while retaining the time variation of records, is also problematic in a fundamental sense. It contradicts the recorded evidence that the characteristics of ground motions are strongly dependent on earthquake magnitude and distance, e.g., frequency characteristics, time variation, and duration of ground motions differ significantly between moderate and large earthquakes, and whether the motions are recorded close to or far from the earthquake source.

The objective of our research is to develop the concepts and methodologies for defining three components of ground motions that are consistent with the seismic hazard for the site, faithful to seismological science, conform to recorded ground motion data, and reflects the statistical variability intrinsic to ground motions.

Completed Ph.D. students:

  • Neal Simon Kwong, 2015

Collaborators:

  • Dr. Robin K. McGuire
  • Professor Neal Simon Kwong

Publications:

  • N. S. Kwong, and A. K. Chopra, “A Generalized Conditional Mean Spectrum and its Application for Intensity-Based Assessments of Seismic Demands,” Earthquake Spectra, Vol. 33, No. (1): pp. 123–143, February 2017 .
  • N. Simon Kwong, and A. K. Chopra, “Evaluation of the Exact Conditional Spectrum and Generalized Conditional Intensity Measure Methods for Ground Motion Selection, Earthquake Engineering and Structural Dynamics, Vol. 45, No. 5, pp. 757–777, April 2016.
  • N. Simon Kwong, A. K. Chopra, and R. K. McGuire, "A Ground Motion Selection Procedure for Enforcing Hazard Consistency and Estimating Seismic Demand Hazard Curves,;quot; Earthquake Engineering and Structural Dynamics, Vol. 44, No. 14, pp. 2467–2487, November 2015.
  • N. Simon Kwong, A. K. Chopra, and R. K. McGuire, "Evaluation of Ground Motion Selection and Modification Procedures using Synthetic Ground Motions," Earthquake Engineering and Structural Dynamics, Vol. 44, No. 11, pp. 1841–1861, September 2015.
  • N. Simon Kwong, A. K. Chopra, and R. K. McGuire, ;quot;Author’s Reply to the Discussion by Brendon A. Bradley of 'A Framework for the Evaluation of Ground Motion Selection and Modification Procedures'" Earthquake Engineering and Structural Dynamics, Vol. 44, No. 5, pp. 823–828, April 2015.
  • N. Simon Kwong, A. K. Chopra, and R. K. McGuire, "A Framework for the Evaluation of Ground Motion Selection and Modification Procedures," Earthquake Engineering and Structural Dynamics, Vol. 44, No. 5, pp. 795–815, April 2015.

 

EARTHQUAKE ANALYSIS, DESIGN, AND SAFETY EVALUATION OF CONCRETE ARCH DAMS

Seismic safety evaluation of proposed or existing concrete dams requires analysis of a large three-dimensional finite element (FE) model of the dam including several factors: dam-water interaction, including water compressibility, reservoir bottom interaction, and the large extent of the reservoir in the upstream direction: dam-foundation interaction, including foundation inertial effects, material and radiation damping, and the semi-infinite extent of the foundation rock. Over the past three decades, research has conclusively demonstrated that these factors significantly influence the earthquake response of dams and must be rigorously treated.

Although dam-water-foundation interaction effects are rigorously treated in EAGD-84 and EACD-3D-96, these computer codes, resulting from our previous research, have several limitations: linear systems, homogeneous foundation rock, uniform canyon, and spatially-uniform ground motion, assumptions that are inappropriate for many practical situations. Thus these programs cannot consider concrete cracking, dam sliding, or other nonlinear effects such as: non-homogeneous foundations or irregular reservoir geometry, and spatial variations that invariably exist in ground motion around the canyon. All of these factors are often important in practical application.

Recently, the EACD computer program has been extended to include spatial variations in ground motion at the dam-rock interface. The excitation, defined as the free-field ground motion at the dam-foundation rock interface, is specified at every node on the interface. Even in the case of the most extensively instrumented dams, however, such ground motion data is recorded at few locations at most. Therefore, a procedure to interpolate (and extrapolate) the ground motions at all nodes along the interface is presented.

By comparing computed structural responses to the earthquake motions recorded at two arch dams—Mauvoisin Dam, Switzerland, and Pacoima Dam, California—it is demonstrated that damping values assigned to the dam alone and the foundation rock separately must be consistent with damping “measured” from forced vibration tests or system identification methods applied to recorded motions during small earthquakes; the measured damping reflects the total energy dissipation in the overall dam-water-foundation rock system due to several mechanisms. The most important implication is that the current practice of specifying a viscous damping ratio of 5% for the concrete dam alone and a similar value for the foundation rock separately should be abandoned because it is likely to lead to excessive damping in the overall dam-water-foundation rock system, unless the foundation-rock is much softer than concrete.

Spatial variations in ground motion, typically ignored in dam engineering practice, can have profound influence on the earthquake-induced stresses in the dam. This influence obviously depends on the degree to which ground motion varies spatially along the dam-rock interface. Thus, for the same dam, this influence could differ from one earthquake to the next, depending on the epicenter, location, and focal depth of the earthquake relative to the dam site. We are currently working on developing a direct finite element method for nonlinear response analysis of concrete dams interacting with semi-unbounded fluid and foundation work domains, subjected to earthquake excitation defined at a control point. This has been implemented for 2D analysis of gravity dams and validated against the substructure method (EAGD-1984). Implementation of the method for 3D systems is in progress.

Current Graduate Student:

  • Arnkjell Lokke

Completed Ph.D. student:

  • Ushnish Basu, 2004

Collaborators:

  • Dr. Ushnish Basu, LSTC, Inc.
  • Larry Nuss, Bureau of Reclamation
  • Jinting Wang, Tsinghua University, China

Publications:

  • A. Lökke and A. K. Chopra, “Direct Finite Element Method for Nonlinear Analysis of Semi-Unbounded Dam–Water-Foundation Rock System,” Earthquake Engineering and Structural Dynamics, Vol. 46, No. (8): pp. 1267–1285, July 2017.
  • A. Lökke and A. K. Chopra, “A Finite Element Analysis Procedure for Earthquake Analysis of Dam-Water–Foundation Rock Systems: Validation of Method for 2D Problems,” Proceedings, 16th World Conference on Earthquake Engineering, Paper No. 1099, Santiago, Chile, January 2017.
  • A. Lokke and A. K. Chopra, "Response Spectrum Analysis of Concrete Gravity Dams Including Dam–Water–Foundation Interaction," ASCE, Journal of Structural Engineering, Vol. 141, No. 8, pp. 4014202-1–04014202-9.
  • A. K. Chopra, "Comparison of Recorded and Computed Responses of Arch Dams," Proceedings, International Symposium on Dams, Kyoto, Japan, June 2012.
  • A. K. Chopra, "Earthquake Response Analysis Procedures for Evaluating and Upgrading Existing Arch Dams for Seismic Safety," CD-ROM Proceedings, ICOLD 12, Kyoto, Japan, June 2012.
  • F. Lopez and A. K. Chopra, "Response-History Analysis of the Moondarra Intake Tower: A Novel Approach Based on New Methodologies for Performance Requirements," CD-ROM Proceedings, ICOLD 12, Kyoto, Japan, June 2012.
  • A. K. Chopra, "Earthquake Analysis of Arch Dams: Factors To Be Considered," ASCE, Journal of Structural Engineering, Vol. 138, No. 2, pp. 205–214, February 2012.
  • A. K. Chopra and J.-T. Wang, "Earthquake Response of Arch Dams to Spatially Varying Ground Motions," Earthquake Engineering and Structural Dynamics, Vol. 39, No. 8, pp. 887–906, July 2010.
  • J.-T. Wang and A. K. Chopra, "Linear Analysis of Concrete Arch Dams including Dam-Water-Foundation Rock Interaction considering Spatially Varying Ground Motions," Earthquake Engineering and Structural Dynamics, Vol. 39, No. 7, pp. 731–750, June 2010.
  • A. K. Chopra and L. Nuss, "Seismic Safety Evaluation and Upgrading of Arch Dams," Proceedings, ICOLD 09, Brasilia, Brazil, May 21–24, 2009.
  • J.-T. Wang and A. K. Chopra, "EACD-3D-2008: A Computer Program for Three Dimensional Earthquake Analysis of Concrete Dams Considering Spatial-Varying Ground Motion," UCB/EERC-2008-04, Earthquake Engineering Research Center, University of California, Berkeley, December 2008, 150 pgs.
  • A. K. Chopra and J.-T. Wang, "Analysis and Response of Concrete Arch Dams Including Dam-Water-Foundation Rock Interaction to Spatially-Varying Ground Motions," UCB/EERC–2008–03, Earthquake Engineering Research Center, University of California, Berkeley, December 2008, 127 pgs.
  • A. K. Chopra, "Earthquake Analysis of Arch Dams: Factors To Be Considered," Proceedings, CD-ROM, Paper No. S. 039, 14th World Conference on Earthquake Engineering, Beijing, China, October 12–17, 2008.
  • U. Basu and A. K. Chopra, "Perfectly Matched Layers for Transient Elastodynamics of Unbounded Domains," International Journal for Numerical Methods in Engineering, Vol. 59, pp. 1039–1074, March 2004.
  • U. Basu and A. K. Chopra, "Perfectly Matched Layers for Time-Harmonic Elastodynamics of Unbounded Domains: Theory and Finite-Element Implementation," Computational Methods in Applied Mechanics and Engineering, Elsevier, Vol. 192, pp. 1337–1375, March 2003.
CV Text

EDUCATION

  • Ph.D. Civil Engineering, University of California, Berkeley, 1966
  • M.S. Civil Engineering, University of California, Berkeley, 1963
  • B.S. Civil Engineering, Banaras Hindu University, India, 1960

ACADEMIC EXPERIENCE

  • 2016–          Horace, Dorothy, and Katherine Johnson Chair in Engineering, Emeritus, University of California, Berkeley
  • 1992–2016. Horace, Dorothy, and Katherine Johnson Chair in Engineering, University of California, Berkeley
  • 1991–1993. Chair, Structural Engineering, Mechanics and Materials Group, Department of Civil and Environmental Engineering
  • 1967–2016. Member of the Faculty, Civil Engineering and Environmental Engineering, University of California Berkeley

KEYNOTE LECTURES AND DISTINGUISHED LECTURES (Recent)

  • "Earthquake Analysis, Design, and Safety Evaluation of Concrete Dams, Keynote Lecture, 5th International Nigel Priestley Seminar, Pavia, May 2019.
  • "Earthquake Analysis of Concrete Gravity Dams, Central Water Commission, New Delhi, India, January 2019
  • "Earthquake Analysis and Response of Concrete Dams," Newmark Distinguished Lecture, University of Illinois, Urbana-Champaign, May 2017
  • "Earthquake Analysis of Concrete Dams," Sino-Dam 2016: International Workshop on Long-Term Stability of High Dams, Beijing, October 2016.
  • "Earthquake Analysis, Design, and Safety Evaluation of Concrete Gravity Dams," International Engineering and Infrastructure Congress, Panama Canal, 2012.
  • "Estimating Seismic Demands for Performance-Based Engineering of Buildings,” International Conference on Urban Construction in the Vicinity of Faults," Tabriz, Iran, September 2011.
  • "Estimating Seismic Demands for Performance-Based Engineering of Buildings," Keynote Lecture, Congreso Estructuras 2011 and XI Seminario de Ignenieria Estructural Y Sismica, San Jose, Costa Rica, August 2011.
  • "Earthquake Analysis, Design, and Safety Evaluation of Concrete Gravity Dams," Keynote Lecture, Congreso Nacional de Ingenieria Sismica, Medellin, Colombia, May 2011.
  • "Earthquake Analysis, Design, and Safety Evaluation of Concrete Dams," Distinguished Lecture Series on Structural Engineering and Mechanics, University of California, Los Angeles, California, May 2010.
  • "Earthquake Analysis of Arch Dams," Keynote Lecture, Sakarya International Symposium of Earthquake Engineering, Kocaeli, Turkey, October 2009.
  • "Earthquake Analysis of Arch Dams," Keynote Lecture, XIII Convegno Anidis, Bologna, Italy, June 2009.
  • "Earthquake Analysis of Arch Dams: Factors To Be Considered," Keynote Lecture, 14th World Conference on Earthquake Engineering, Beijing, China, October 2008.
  • "Estimating Seismic Demands for Performance-Based Engineering of Buildings," Keynote Address, International Conference on Earthquake Engineering and Disaster Mitigation, Jakarta, Indonesia, April 2008.
  • "Estimating Seismic Demands for Performance-Based Engineering of Buildings," Keynote Address, Conference, Thirty Years from the Romania Earthquake of 4 March 1977, Bucharest, Romania, March 2007.
  • "Estimated Seismic Demands for Performance-Based Engineering of Buildings," Keynote Address, IX Jornadas de Sismologia, Conception, Chile, November 2005.
  • "Estimated Seismic Demands for Performance-Based Engineering of Buildings," Keynote Address, Earthquake Engineering in the 21st Century, International Conference to Commemorate 40th Anniversary of the Institute of Earthquake Engineering and Engineering Seismology, Skopje. Macedonia, September 2005.
  • "Estimating Seismic Demands for Performance-Based Engineering of Buildings," Keynote Lecture, 13th World Conference Earthquake Engineering, Vancouver, Canada, August 2004.
  • "Estimating Seismic Demands for Performance-Based Seismic Engineering of Buildings," Special Lecture for Graduating M.S. Class in Earthquake Engineering, Aristotle University, Thessaloniki, Greece, June 2003.
  • "A Modal Pushover Analysis Procedure to Estimate Seismic Demands for Buildings: Summary and Evaluation," Keynote Lecture, 5th National Conference on Earthquake Engineering, Istanbul, Turkey, May 2003.
  • "Estimating Seismic Demands for Performance-Based Seismic Engineering of Buildings," Emilio Rosenblueth Lecture, University of Mexico, Mexico City, March 2003.
  • "Earthquake Analysis, Design, and Safety Evaluation of Arch Dams," Invited Keynote Lecture, 3rd U.S.-Japan Workshop on Advanced Research on Earthquake Engineering for Dams, San Diego, Calif., June 2002.

 

ACTIVITIES IN PROFESSIONAL SOCIETIES (SELECTED)

  • American Society of Civil Engineers, Engineering Mechanics Division: Executive Committee [Chairman (1986); Member (1983–1987); Secretary (1981–1983)]; Advisory Board (1986–1991) [Chairman (1989)]
  • American Society of Civil Engineers, Structural Division: Executive Committee [Chairman (1991); Member (1988–1992)]; Awards Committee (1991–1996)
  • Applied Technology Council: Board of Directors(1972–1974); Task Committee on Structural Analysis, Applied Technology Council Project ATC 3 for the development of new recommendations for the seismic design provisions of building codes [Chairman (1974–1977)]
  • Earthquake Engineering Research Institute: Member; Editorial Board Earthquake Spectra (1999–2006); Board of Directors (1990–1993); Steering Committee, 8th World Conference on Earthquake Engineering
  • International Association for Earthquake Engineering: Earthquake Engineering and Structural Dynamics Executive Editor; Executive Committee Honorary Member (2004–present)
  • Seismological Society of America: Member; Board of Directors (1982–1983)
  • Structural Engineers Association of California: Member, Honorary Member SEAONC (2010–present); Fellow (2004–present), Board of Directors (1987–1989)

SERVICE TO EDUCATIONAL OR GOVERNMENTAL AGENCIES (RECENT)

  • National Academy of Engineering: Membership Policy Committee (2004–2006); Section Liaison to National Research Council (2004–2007); Nominating Committee (2003-2004); Civil Engineering Peer Committee (1997–1999); Chair (1999)
  • Member, Department of Conservation, Strong Motion Instrumentation Program, State of California, Strong Motion Instrumentation Advisory Committee (2003–present)
  • Member, Technical Subcommittee 2 on Design Criteria and Analysis, Building Seismic Safety Council, National Institute of Building Sciences (1998–2001)
  • Member, Consulting Board for Earthquake Analysis, Division of Safety of Dams, Department of Water Resources, State of California (1996–present)
  • Member, Advisory Committee on Structural Safety of Department of Veterans Affairs Facilities, Department of Veterans Affairs, Washington, D.C. (1995–2000)

EDITORIAL REVIEW SERVICE (SELECTED)

  • Executive Editor (2004–present) Earthquake Engineering and Structural Dynamics, the Journal of the International Association for Earthquake Engineering, General Editor (1996–2004); Associate Editor (1988–1996)
  • Editorial Board, Earthquake Spectra (1999–2006)
  • Editorial Committee, Journal of Earthquake Technology, Indian Society for Earthquake Technology (1999–present)
  • National Science Foundation, Chair, Panel to review research proposals (June 1994)
  • Editorial Advisory Board, Dam Engineering, an international journal published by International Water Power and Dam Construction (1990–presemt)
  • Member, Advisory Board, MIT Press Series in Structural Mechanics (1979–1982)
  • Editorial Board, Journal of the Engineering Mechanics Division, ASCE (1975–1977)
  • National Academy of Sciences Review Committee for "The Great Alaska Earthquake of 1964: Engineering" (1972)

CONSULTING (RECENT)

  • 2016- . East Bay Municipal Utilities District, Oakland, California
  • 2015- . B.C. Hydro, Vancouver, B.C. Canada
  • 2014-2016. Iberdola Ingenieria Y Construccion, Madrid, Spain
  • 2012. INTEGRAL: Ingenero Consultares, Medellin, Columbia
  • 2012-2015. City and County of San Francisco
  • 2011. Iberdola Ingenieria Y Construccion, Madrid, Spain: Seismic evaluation of Valdecanas Dam
  • 2011–present. Pacific Gas & Electric, Co.: Seismic evaluation of Pitt 3 Dam
  • 2010–2014. GHD Pty, Ltc., Australia: Seismic evaluation of Moondarra Tower
  • 2009–present. Panama Canal Authority Advisory Board: Develop a new building code for Panama
  • 2009–2011. City & County of San Francisco: Structural Design Reviewer, Transbay 11A Project, an 8-story building
  • 2007-2008. EDELCA, Caracas, Venezuela: Evaluation of Macagua, Guri, Caruachi, and Tocomo Dams and power houses
  • 2007–2010. San Diego County Water Authority, San Diego, California: Sesign of San Vicente Dam Raise
  • 2007–present. Panama Canal Authority: Seismic evaluation of existing locks and design of new locks as part of the expansion project of the Panama Canal
  • 2007–2008. INTERTECHNE, Curitiba, Brazil: Seismic design of Palomina Dam, Dominican Republic
  • 2006–present. U.S. Bureau of Reclamation: Seismic evaluation of East Canyon Dam, Utah
  • 2006–2010. Pacific Gas & Electric Co.: Seismic evaluation of Lake Alamnor Tower
  • 2006. University of California, San Francisco: Design & Construction, seismic evaluation of Moffitt Hospital
  • 2002–2004. U.S. Army Corps of Engineers, Sacramento District: Seismic analysis and design of modifications to Folsom Dam
  • 2001. Acres International: Seismic upgrade of Casad Dam Intake Tower
  • 2001. Integral Ltda., Medellin, Colombia: Seismic safety evaluation of Guatape and Troneras outlet towers
  • 2001. Metropolitan Water District of Southern California: Seismic safety evaluation of Lake Mathews Dam outlet tower
  • 2000. Hidroestudios, Bogota, Colombia: Seismic analysis and design of Miel I Dam
  • 1998–present. Panama Canal Commission, Panama City: Seismic safety evaluation of spillways, dams, and locks at Panama Canal
  • 1998-1999. California Division of Safety of Dams Safety: Evaluation of Milliken Dam, California
  • 1997–1999. Portland General Electric, Portland, Oregon: Seismic safety evaluation of River Mill Dam, Oregon
  • 1997–2000. B.C. Hydro, Vancouver, B.C., Canada: Seismic safety evaluation of Seven Mile Dam
  • 1996–present. Division of Safety of Dams, Department of Water Resources, State of California: Member, Consulting Board for Earthquake Analysis

PUBLICATIONS
Over 330 publications (including two books) in structural dynamics and earthquake engineering.

Personal Website
https://www.anilkchopra.com/
Awards
  • The Nigel Priestley Prize (formerly the Rose School Prize), 2018, Pavia, Italy, to honor individuals for creativity, innovation, research, and professional achievements and excellence in education in the field of earthquake engineering and engineering seismology.
  • Elected to the Academy of Civil and Environmental Engineering Distinguished Alumni, University of California, Berkeley, 2017
  • Newmark Distinguished Lecture, 2017, University of Illinois, Urbana-Champaign
  • Honorary Member, Earthquake Engineering Research Institute, 2017
  • Berkeley Citation, University of California, Berkeley, 2016, “for distinguished achievement and for notable service to the University.”
  • Norman Medal, American Society of Civil Engineers, 2013
  • National Award for Significant Contributions in Science and Technology; SENACYT: La Secretaria Nacional de Ciencia, Technologia & Innovacion, Panama, 2012.
  • Kwang-Hua Visiting Professor, Tongji University, Shanghai, China, June 2011.
  • Listed in "20 people who have made the biggest difference in dam engineering over the past 10 years," International Power & Dam Construction magazine, 2011
  • Elected Honorary Member, Structural Engineers Association of Northern California, 2010
  • Honorary Professor, Harbin, Institute of Technology, Harbin, China, 2009
  • Listed in "60 most influential people in the hydropower and dams industry…over the past 60 years," International Power & Dam Construction magazine, 2009
  • Doctor Honnoris Causa, Technical University of Engineering, Bucharest, Romania, 2007
  • Elected Fellow, Structural Engineers Association of California, 2004
  • Elected Honorary Member International Association for Earthquake Engineering, 2004
  • Miller Research Professor, University of California, Berkeley, 2003-2004
  • George W. Housner Medal, Earthquake Engineering Research Institute, 2002
  • National Award for Significant Contribution in Science and Technology, Government of Venezuela, 2002
  • Norman Medal, American Society of Civil Engineers, 2001
  • Distinguished Teaching Award, University of California at Berkeley, 1999
  • Ernest E. Howard Award, American Society of Civil Engineers, 1998
  • Nathan M. Newmark Medal, American Society of Civil Engineers, 1993
  • Horace, Dorothy and Katherine Johnson Chair in Engineering, University of California of Berkeley, 1992
  • Norman Medal, American Society of Civil Engineers, 1991
  • Miller Research Professor, University of California at Berkeley, Fall, 1990
  • Raymond C. Reese Research Prize, American Society of Civil Engineers, 1989
  • AT&T Foundation Award, American Society for Engineering Education, 1987
  • Honor Award, Association of Indians in America, 1985
  • Elected to the National Academy of Engineering, 1984
  • Distinguished Alumnus Award, Banaras Hindu University, Varanasi, India, awarded at the Diamond Jubilee Celebration of Engineering Education, 1980
  • Norman Medal, American Society of Civil Engineers, 1979
  • Walter L. Huber Civil Engineering Research Prize, American Society of Civil Engineers, 1975
  • Certificate of merit awarded to the paper, "Analysis of Earthquake Performance of Koyna Dam," by the Indian Society of Earthquake Technology, 1974
  • Banaras Hindu University Gold Medal for standing first in order of merit at the B.Sc. (Civil Engineering) examination, 1960
Publications

RECENT PUBLICATIONS
Books

  • A. K. Chopra, Dynamics of Structures: Theory and Applications to Earthquake Engineering, 5th Edition, Prentice Hall, Englewood Cliffs, New Jersey, 2017. The S.I. edition of this book was published in 2015. (This textbook has been translated into Japanese, Korean, Chinese, Spanish, Greek, Turkish, and Persian.)
  • A. K. Chopra, Earthquake Dynamics of Structures: A Primer, Second Edition, Monograph published by Earthquake Engineering Research Institute, Oakland, Calif., 2005, 129 pgs.

Journal Papers

  • A. Lokke and A. K. Chopra, "Direct Finite Element Method for Nonlinear Earthquake Analysis of Concrete Dams--Simplification, Modeling, and Practical Application," Earthquake Engineering and Structural Dynamics, Vol. 48, No. 7, 818-842, March 2019.
  • N. Simon Kwong, and A. K. Chopra, "Determining Bidirectional Ground Motions for Nonlinear Response History Analysis of Buildings at Far-Field Sties, Earthquake Spectra, Vol. 34, No. 4, 1931-1954, November 2018.
  • A. Lokke, and A. K. Chopra, "Direct Finite Element Method for Nonlinear Analysis of 3-Dimensional Semi-Unbounded Dam-Water-Foundation Rock Systems," Earthquake Engineering and Structural Dynamics, Vol. 47, No. 5, pp. 1309–1328, July 2017.
  • A. Lokke, and A. K. Chopra, "Direct Finite Element Method for Nonlinear Analysis of Semi-Unbounded Dam-Water-Foundation Rock System," Earthquake Engineering and Structural Dynamics, Vol. 46, No. 8, pp. 1267–1285, July 2017.
  • N. Simon Kwong, and A. K. Chopra, "A generalized Conditional Mean Spectrum and its Application for Intensity-Based Assessments of Seismic Demands, Earthquake Spectra, Vol. 33, No. 1, pp. 123–143, February 2017.
  • N. Simon Kwong, and A. K. Chopra, "Evaluation of the Exact Conditional Spectrum and Generalized Conditional Intensity Measure Methods for Ground-Motion Selection," Earthquake Engineering and Structural Dynamics, Vol. 45, No. 5, pp. 757–777, April 2016.
  • A. K. Chopra, and F. McKenna, "Modeling Viscous Damping in Nonlinear Response History Analysis of Buildings for Earthquake Excitation," Earthquake Engineering and Structural Dynamics, Vol. 45, No. 2, pp. 193–211, February 2016.
  • N. Simon Kwong, A. K. Chopra, and R. K. McGuire, "A Ground Motion Selection Procedure for Enforcing Hazard Consistency and Estimating Seismic Demand Hazard Curves," Earthquake Engineering and Structural Dynamics, Vol. 44, No. 14, pp. 2467–2487, November 2015.
  • N. Simon Kwong, A. K. Chopra, and R. K. McGuire, "Evaluation of Ground Motion Selection and Modification Procedures using Synthetic Ground Motions," Earthquake Engineering and Structural Dynamics, Vol. 44, No. 11, pp. 1841–1861, September 2015.
  • C. Menun, J. C. Reyes, and A. K. Chopra, "Errors Caused by Peak Factor Assumptions in Response-Spectrum-Based Analyses," Earthquake Engineering and Structural Dynamics, Vol. 44, No. 11, pp. 1729–1746, September 2015.
  • N. Simon Kwong, A. K. Chopra, and R. K. McGuire, "Author’s Reply to the Discussion by Brendon A. Bradley of 'A Framework for the Evaluation of Ground Motion Selection and Modification Procedures'," Earthquake Engineering and Structural Dynamics, Vol. 44, No. 5, pp. 823–828, April 2015
  • N. Simon Kwong, A. K. Chopra, and R. K. McGuire, "A Framework for the Evaluation of Ground Motion Selection and Modification Procedures," Earthquake Engineering and Structural Dynamics, Vol. 44, No. 5, pp. 795–815, April 2015
  • A. Lokke and A. K. Chopra, "Response Spectrum Analysis of Concrete Gravity Dams Including Dam–Water–Foundation Interaction," ASCE, Journal of Structural Engineering, Vol. 141, No. 8, pp. 04014202-1–04014202-9, September 2014.
  • E. Kalkan and A. K. Chopra, "Evaluation of Modal-Pushover-Based Scaling of One Component of Ground Motion: Tall Buildings," Earthquake Spectra, Vol. 24, No. 4, pp. 1469–1493, November 2012.
  • A. K. Chopra, "Earthquake Analysis of Arch Dams: Factor To Be Considered," ASCE, Journal of Structural Engineering, Vol. 138, No. 2, pp. 205–214, February 2012.
  • A. K. Chopra, "Joseph Penzien: A Personal Remembrance," Earthquake Spectra, Vol. 28, No. 2, pp. 401–404, February 2012.
  • J. C. Reyes and A. K. Chopra, "Three-dimensional Modal Pushover Analysis of Buildings Subjected to Two Components of Ground Motions, including its Evaluation for Tall Buildings," Earthquake Engineering and Structural Dynamics, Vol. 40, No. 7, pp. 789–806, June 2011.
  • E. Kalkan and A. K. Chopra, "Modal-pushover-based Ground-motion Scaling Procedure," ASCE, Journal of Structural Engineering, Vol. 137, No. 3, pp. 298–310, March 2011.
  • E. Kalkan and A. K. Chopra, "Practical Guidelines to Select and Scale Earthquake Records for Nonlinear Response History Analysis of Structures," USGS Open File Report 2010-1068, 126 pgs. (http://pubs.usgs.gov/of/2010/1068/), 2010, U.S. Geological Survey, Menlo Park, CA.
  • D. Dreger, G. Hurtado, A. K. Chopra, and S. Larsen, "Near-Field Across-Fault Seismic Ground Motion," Bulletin of the Seismological Society of America, Vol. 40, No. 1, pp. 202–221, February 2011.
  • S.-W. Han, K. Moon, and A. K. Chopra, "Application of MPA to Estimate Probability of Collapse of Structures," Earthquake Engineering and Structural Dynamics, Vol. 39, No. 11, pp. 1259–1278, September 2010.
  • A. K. Chopra and J.-T. Wang, "Earthquake Response of Arch Dams to Spatially Varying Ground Motions," Earthquake Engineering and Structural Dynamics, Vol. 39, No. 8, pp. 887–906, July 2010.
  • J.-T. Wang and A. K. Chopra, "Linear Analysis of Concrete Arch Dams, including Dam-Water-Foundation Rock Interaction considering Spatially Varying Ground Motions," Earthquake Engineering and Structural Dynamics, Vol. 39, No. 7, pp. 731–730, June 2010.
  • R. K. Goel and A. K. Chopra, "Nonlinear Analysis of Ordinary Bridges Crossing Fault Rupture Zones," Journal of Bridge Engineering, ASCE, Vol. 14, pp. 216–224, May/June, 2009.
  • H. Bobadilla and A. K. Chopra, "Evaluation of the MPA Procedure for Estimating Seismic Demands: RC-SMRF Buildings," Earthquake Spectra, Vol. 24, pp. 827–845, November 2008.
  • R. K. Goel and A. K. Chopra, "Role of Shear Keys in Seismic Behavior of Bridges Crossing Fault-Rupture Zones," Journal of Bridge Engineering, ASCE, Vol. 13, No. 3, pp. 298–408, July-August 2008.
  • A. K. Chopra, "Elastic Response Spectrum: A Historical Note," Earthquake Engineering and Structural Dynamics, Vol. 36, pp. 3–12, January 2007.
  • S.-W. Han and A. K. Chopra, "Approximate Incremental Dynamic Analysis using the Modal Pushover Analysis Procedure," Earthquake Engineering and Structural Dynamics, Vol. 35, pp. 1853–1873, December 2006.
  • K. L. Ryan and A. K. Chopra, "Estimating Seismic Demands for Isolation Bearings with Building Overturning Effects," Journal of Structural Engineering, ASCE, Vol. 132, pp. 1118–1128, July 2006.
  • K. L. Ryan and A. K. Chopra, "Estimating Bearing Response in Symmetric and Asymmetric-Plan Isolated Buildings with Rocking and Torsion", Earthquake Engineering and Structural Dynamics, Vol. 35, pp. 1009–1036, July 2006.

Conference Papers

  • A. K. Chopra, and F. McKenna, “Modeling Viscous Damping in Nonlinear Response History Analysis of Buildings,” Proceedings, 16th World Conference on Earthquake Engineering, Santiago, Chile, January 2017 .
  • A. Lökke, and A. K. Chopra, “A Finite Element Analysis Procedure for Earthquake Analysis of Dam-Water–Foundation Rock Systems: Validation of Method for 2D Problems,” Proceedings, 16th World Conference on Earthquake Engineering, Paper No. 1099, Santiago, Chile, January 2017 .
  • A. K. Chopra, “Earthquake Analysis of Concrete Dams: Factors to be Considered,” Proceedings, Tenth U.S. National Conference on Earthquake Engineering, Anchorage, AK, July 2014 .
  • A. K. Chopra, “Comparison of Recorded and Computed Earthquake Response of Arch Dams,” Proceedings, U.S. Society of Dams Annual Meeting, San Francisco, California, April 2014 .
  • A. K. Chopra, “Earthquake Analysis of Concrete Gravity Dams: Factors To Be Considered,” Proceedings, U.S. Society of Dams Annual Meeting, San Francisco, California, April 2014 .
  • A. K. Chopra, and J.-T. Wang, “Comparison of Recorded and Computed Earthquake Response of Arch Dams,” Proceedings, 15th World Conference on Earthquake Engineering, Lisbon, Portugal, September 2012 .
  • J. C. Reyes, O. A. Quintero, and A. K. Chopra, “Modal-Pushover-Based Scaling of Records for Nonlinear RHA of One-Story Unsymmetric-Plan Buildings,” Proceedings, 15th World Conference on Earthquake Engineering, Lisbon, Portugal, September 2012 .
  • F. Lopez and A. K. Chopra, “Response-History Analysis of the Moondarra Intake Tower: A Novel Approach Based on New Methodologies for Performance Requirements, Proceedings, International Symposium on Dams, ICOLD 12, Kyoto, Japan, June 2012.
  • A. K. Chopra, “Comparison of Recorded and Computed Responses of Arch Dams,” CD Rom Proceedings, International Symposium on Dams, Kyoto, Japan, June 2012 .
  • J. C. Reyes, and A. K. Chopra, “Modal Pushover-based-scaling of Two Components of Ground Motions for Nonlinear RHA of Structures,” Proceedings, Workshop on the Occasion of Polat Gulkan’s Retirement, Earthquake Engineering and Engineering Seismology: Past Achievements and Future Prospects, Middle East Technical University, Ankara, Turkey, October 2011
  • U. Basu, and A. K. Chopra, “Transient Finite-Element Soil-Structure Interaction Analysis of Nuclear Power Plants,” Proceedings, NEA/IAEA Workshop on “Soil-Structure Interaction (SSI) Knowledge and Effect on the Seismic Assessment of NPPs Structures on Components, Ottawa, Canada, October 2010.
  • A. K. Chopra, and J.-T. Wang, “Earthquake Analysis of Arch Dams to Spatially-Varying Ground Motions,” Proceedings, Paper No. 737, 9th U.S. and 10th Canadian Conference on Earthquake Engineering, Toronto, Canada, July 2010
  • J. C. Reyes, and A. K. Chopra, “Evaluation of Modal Pushover (MPA) Analysis for Tall Buildings Subjected to Two Components of Ground Motion,” Proceedings, Paper No. 807, 9th U.S. and 10th Canadian Conference on Earthquake Engineering, Toronto, Canada, July 2010.
  • H. Bobadilla, and A. K. Chopra, “Evaluation of the MPA Procedure for Estimating Seismic Demands: RC-SMRF Buildings,” Proceedings,10 Congreso Chileno de Sismologia e Ingeneieria Antisismica, Santiago, Chile, May 2010.
  • A. K. Chopra, "Earthquake Analysis of Arch Dams," Proceedings, XIII Convegno Anidis 2009, Bologna, Italy, June 2009.
  • A. K. Chopra and L. Nuss, "Seismic Safety Evaluation and Upgrading of Arch Dams," Proceedings, ICOLD 09, Brasilia, Brazil, May 2009.
  • H. Bobadilla and A. K. Chopra, "Evaluation of the MPA Procedure for Estimating Seismic Demands of RC-SMRF Buildings," Proceedings, 14th World Conference on Earthquake Engineering, Beijing, China, CD-ROM, October 2008, Paper No. 05–01–374.
  • A. K. Chopra, "Earthquake Analysis of Arch Dams: Factors To Be Considered," Proceedings, 14th World Conference on Earthquake Engineering, Beijing, China, CD-ROM, October 2008, Paper No. S13–039.
  • R. K. Goel and A. K. Chopra, "Simplified Analysis of Bridges Crossing Fault-Rupture Zones," Proceedings, Sixth National Conference on Bridge Engineering, Charleston, South Carolina, July 2008.
  • A. K. Chopra, "Application of Modal Pushover Analysis to RC Frames and Incremental Dynamic Analysis," Proceedings, Nonlinear Static methods for Design/Assessment of 3D Structures, (Eds. R. Bento and R. Pinho), Lisbon, Portugal, May 2008, pp. 75–83.
  • A. K. Chopra, "Estimating Seismic Demands for Performance-Based Engineering of Buildings," Proceedings, Thirty Years from the Romania Earthquake of March 4, 1977, Bucharest, Romania, March 2007, 20 pp.
  • A. K. Chopra and R. K. Goel, "Evaluation of the Modal Pushover Analysis Procedure for Unsymmetric-Plan Buildings," Proceedings, First European Conference on Earthquake Engineering and Seismology, Geneva, Switzerland, September 2006, Paper No. 1327, 12 pp.
  • A. K. Chopra and R. K. Goel, "Evaluation of the Modal Pushover Analysis Procedure for Unsymmetric-Plan Buildings," Proceedings, 8th U.S. National Conference on Earthquake Engineering, San Francisco, California, April 2006, Paper No. 188.
  • R. K. Goel and A. K. Chopra, "Additional Developments in Modal Pushover Analysis," Proceedings, 8th U.S. National Conference on Earthquake Engineering, San Francisco, California, April 2006, Paper No. 185.

Technical Reports

  • N. Simon Kwong and A. K. Chopra, “Selection and Scaling of Ground Motions for Nonlinear Response History  Analysis of Buildings in Performance-Based Earthquake Engineering, PEER Report No. 2015/11, Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, December 2015, 186 pgs .
  • A. Løkke and A. K. Chopra, “Response Spectrum Analysis of Concrete Gravity Dams Including Dam-Water-Foundation Interaction,” PEER Report 2013/17, Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, July 2013, 72 pgs .
  • E. Kalkan and A. K. Chopra, "Practical Guidelines to Select and Scale Earthquake Records for Nonlinear Response History Analysis of Structures," USGS Open File Report 2010-1068, 126 pgs. (http://pubs.usgs.gov/of/2010/2068/), U.S. Geological Survey, Menlo Park, CA, 2010.
  • A. K. Chopra and J.-T. Wang, "Analysis and Response of Concrete Arch Dams Including Dam-Water-Foundation Rock Interaction to Spatially-Varying Ground Motions," UCB/EERC–2008–03, Earthquake Engineering Research Center, University of California, Berkeley, December 2008, 127 pgs.
  • J.-T.Wang and and A. K. Chopra, "EACD-3D-2008: A Computer Program for Three Dimensional Earthquake Analysis of Concrete Dams Considering Spatial-Varying Ground Motion," UCB/EERC–2008–04, Earthquake Engineering Research Center, University of California, Berkeley, December 2008, 150 pgs.
  • H. Bobadilla and A. K. Chopra, "Modal Pushover Analysis for Seismic Evaluation of Reinforced Concrete Special Moment Resisting Frame Buildings," UCB/EERC–2007–01, Earthquake Engineering Research Center, September 2007, 68 pgs.