Abstract

This paper presents a summary of current practice and recent developments in the application of passive energy dissipation systems for seismic protection of structures. The emphasis is on the application of passive energy dissipation systems within the framing of building structures. Major topics that are presented include basic principles of energy dissipation systems, descriptions of the mechanical behavior and mathematical modeling of selected passive energy dissipation devices, advantages and disadvantages of these devices, development of guidelines and design philosophy for analysis and design of structures employing energy dissipation devices, and design considerations that are unique to structures with energy dissipation devices. A selection of recent applications of passive energy dissipation systems is also presented.

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Acknowledgments

This paper was developed as part of the efforts of the American Society of Civil Engineers (ASCE) Task Committee on Supplemental Damping Systems for Seismic Applications, of which each of the writers was a member. The task committee was in turn supported by the ASCE Seismic Effects Committee. The support of ASCE is gratefully acknowledged. The writers would like to acknowledge the anonymous reviewers whose comments greatly improved this paper.

References

AISC. (2005). Seismic provisions for structural steel buildings, Chicago.
Applied Technology Council (ATC). (1997a). “NEHRP commentary on the guidelines for the seismic rehabilitation of buildings.” 1997 Ed., Rep. No. FEMA-274, Prepared for the Building Seismic Safety Council (BSSC) by the Applied Technology Council (ATC), Federal Emergency Management Agency (FEMA), Washington, D.C.
Applied Technology Council (ATC). (1997b). “NEHRP guidelines for the seismic rehabilitation of buildings.” 1997 Ed., Rep. No. FEMA-273, Prepared for the Building Seismic Safety Council (BSSC) by the Applied Technology Council (ATC), Federal Emergency Management Agency (FEMA), Washington, D.C.
ASCE. (2000). “Prestandard and commentary for the seismic rehabilitation of buildings.” Report No. FEMA-356, Federal Emergency Management Agency, Washington, D.C.
ASCE. (2005). “Minimum design loads for buildings and other structures.” ASCE/SEI 7–05, Reston, Va.
Asher, J. W., Young, R. P., and Ewing, R. D. (1996). “Seismic isolation design of the San Bernardino County Medical Center replacement project.” Struct. Des. Tall Build., 5(4), 265–279.
Bergman, D. M., and Hanson, R. D. (1993). “Viscoelastic mechanical damping devices tested at real earthquake displacements.” Earthquake Spectra, 9(3), 389–418.
Black, C. J., Makris, N., and Aiken, I. (2004). “Component testing, seismic evaluation and characterization of buckling-restrained braces.” J. Struct. Eng., 130(6), 880–894.
Brown, P., Aiken, I. D., and Jafarzadeh, F. J. (2001). “Seismic retrofit of the Wallace F. Bennett Federal Building.” Modern steel construction, AISC, Chicago.
Building Seismic Safety Council (BSSC). (2004). “NEHRP recommended provisions for seismic regulations for new buildings and other structures.” 2003 Ed., Rep. Nos. FEMA-450/1 and FEMA-450/2, Prepared by the Building Seismic Safety Council (BSSC) for the Federal Emergency Management Agency (FEMA), Washington, D.C.
Chang, C., Pall, A., and Louie, J. (2006). “The use of friction dampers for seismic retrofit of the Monterey County Government Center.” Proc., 8th U. S. National Conf. on Earthquake Engineering, EERI, Oakland, Calif., Paper No. 951.
Chang, K. C., and Lin, Y.-Y. (2004). “Seismic response of full-scale structure with added viscoelastic dampers.” J. Struct. Eng., 130(4), 600–608.
Chang, K. C., Soong, T. T., Lai, M. L., and Nielsen, E. J. (1993). “Development of a design procedure for structures with added viscoelastic dampers.” Proc., ATC-17–1 Seminar on Seismic Isolation, Passive Energy Dissipation and Active Control, Vol. 2, ATC, Redwood City, Calif., 473–484.
Chang, K. C., Soong, T. T., Lai, M. L., and Oh, S.-T. (1995). “Seismic behavior of steel frame with added viscoelastic dampers.” J. Struct. Eng., 121(10), 1418–1426.
Charney, F. A., and McNamara, R. J. (2002). “Use of damped mode shapes to assess the seismic performance of a 39-story building with viscous fluid dampers.” Proc., 7th U.S. National Conf. on Earthquake Engineering, EERI, Oakland, Calif.
Charney, F. A., and McNamara, R. J. (2008). “A comparison of methods for computing equivalent viscous damping ratios of structures with added viscous damping.” J. Struct. Eng., 134(1), 32–44.
Chung, Y. S., Meyer, C., and Shinozuka, M. (1987). “Seismic damage assessment of reinforced concrete members.” Tech. Rep. No. NCEER-87–0022, National Center for Earthquake Engineering Research, State Univ. of New York at Buffalo, Buffalo, N.Y.
Constantinou, M. C., Soong, T. T., and Dargush, G. F. (1998). Passive energy dissipation systems for structural design and retrofit, MCEER Monograph Series, No. 1, Multidisciplinary Center for Earthquake Engineering Research, Buffalo, N.Y.
Constantinou, M. C., and Symans, M. D. (1993a). “Experimental study of seismic response of buildings with supplemental fluid dampers.” Struct. Des. Tall Build., 2(2), 93–132.
Constantinou, M. C., and Symans, M. D. (1993b). “Seismic response of structures with supplemental damping.” Struct. Des. Tall Build., 2(2), 77–92.
Constantinou, M. C., Tsopelas, P., Hammel, W., and Sigaher, A. N. (2001). “Toggle-brace-damper seismic energy dissipation systems.” J. Struct. Eng., 127(2), 105–112.
Dinehart, D. W., Joye, D. D., and Menzoa, E. (2004). “Viscoelastic polymers improve cyclic performance of wood connections.” Proc., 8th World Conf. on Timber Engineering, Association of Finish Civil Engineers RIL, Helsinki, Finland.
Dinehart, D. W., Shenton, H. W., III, and Elliott, T. E. (1999). “The dynamic response of woodframe shear walls with viscoelastic dampers.” Earthquake Spectra, 15(1), 67–86.
Dutil, D. A., and Symans, M. D. (2004). “Experimental investigation of seismic behavior of light-framed wood shear walls with supplemental energy dissipation.” Proc., 13th World Conf. on Earthquake Engineering, International Association of Earthquake Engineering, Tokyo.
Fahnestock, L. A., Sause, R., Ricles, J. M., and Lu, L.-W. (2003). “Ductility demands on buckling-restrained braced frames under earthquake loading.” Earthquake Eng. Eng. Vibration, 2(2), 255–264.
Fierro, E. A., and Perry, C. L. (1993). “San Francisco retrofit design using added damping and stiffness (ADAS) elements.” Proc., ATC-17–1 Seminar on Seismic Isolation, Passive Energy Dissipation, and Active Control, Vol. 2, ATC, Redwood City, Calif., 593–603.
Filiatrault, A. (1990). “Analytical predictions of the seismic response of friction damped timber shear walls.” Earthquake Eng. Struct. Dyn., 19(2), 259–273.
Filiatrault, A., Tremblay, R., and Kar, R. (2000). “Performance evaluation of friction spring seismic damper.” J. Struct. Eng., 126(4), 491–499.
Filiatrault, A., Tremblay, R., and Wanitkorkul, A. (2001). “Performance evaluation of passive damping systems for the seismic retrofit of steel moment-resisting frames subjected to near field ground motions.” Earthquake Spectra, 17(3), 427–456.
Fu, Y., and Kasai, K. (1998). “Comparative study of frames using viscoelastic and viscous dampers.” J. Struct. Eng., 124(5), 513–552.
Goel, R. K. (2000). “Seismic behavior of asymmetric buildings with supplemental damping.” Earthquake Eng. Struct. Dyn., 29(3), 461–480.
Grigorian, C. E., Yang, T. S., and Popov, E. P. (1993). “Slotted bolted connection energy dissipators.” Earthquake Spectra, 9(3), 491–504.
Hanson, R. D., and Soong, T. T. (2001). Seismic design with supplemental energy dissipation devices, Monograph No. 8, EERI Oakland, Calif.
Higgins, C. (2001). “Hysteretic dampers for wood frame shear wall structures.” Proc., 2001 Structures Congress and Exposition, ASCE, Reston, Va.
Hwang, J.-S., Huang, Y.-N., and Hung, Y.-H. (2005). “Analytical and experimental study of toggle-brace-damper systems.” J. Struct. Eng., 131(7), 1035–1043.
Ibrahim, Y. (2005). “A new viscoplastic device for seismic protection of structures.” Ph.D. dissertation, Virginia Polytechnic Institute, Blacksburg, Va.
International Code Council (ICC). (2006). International building code, 2006 Ed., Delmar Cengage Learning, Clifton Park, N.Y.
Kanitkar, R., Aiken, I., Nishimoto, K., and Kasai, K. (2006). “Viscoelastic dampers for the seismic retrofit of buildings: An overview of advancements in viscoelastic materials and analytical capabilities.” Proc., 8th U.S. National Conf. on Earthquake Engineering, EERI, Oakland, Calif., Paper No. 1299.
Kanitkar, R., Harms, M., Crosby, P., and Lai, M.-L. (1998). “Seismic retrofit of a steel moment frame structure using viscoelastic dampers.” J. of Earthquake Technology, 35(4), 207–219.
Kasai, K., Munshi, J. A., Lai, M. L., and Maison, B. F. (1993). “Viscoelastic damper hysteretic model: Theory, experiment and application.” Proc., ATC-17–1 Seminar on Seismic Isolation, Passive Energy Dissipation and Active Control, Vol. 2, ATC, Redwood City, Calif., 521–532.
Kircher, C. A. (1999). “Seismic regulations for passive structural control systems—Overview of United States codes.” Proc., 2nd World Conf. on Structural Control, Wiley, Chichester, U.K.
Ko, E., Mole, A., Aiken, I., Tajirian, F., Rubel, Z., and Kimura, I. (2002). “Application of the unbonded brace in medical facilities.” Proc., 7th U.S. National Conf. on Earthquake Engineering, EERI, Oakland, Calif.
Lee, D., and Taylor, D. P. (2001). “Viscous damper development and future trends.” Struct. Des. Tall Build., 10(5), 311–320.
Lee, K.-S., Sause, R., Ricles, J., Ab-Malek, K., and Lu, L.-W. (2004). “Non-Linear rate-dependent hysteresis model for structural dampers made from ultrahigh damping natural rubber.” J. Rubber Res., 7(2), 79–103.
Lin, W.-H., and Chopra, A. K. (2003). “Earthquake response of elastic single-degree-of-freedom systems with nonlinear viscoelastic dampers.” J. Eng. Mech., 129(6), 597–606.
Liu, W., Tong, M., and Lee, G. C. (2005). “Optimization methodology for damper configuration based on building performance indices.” J. Struct. Eng., 131(11), 1746–1756.
Lobo, R. F., Bracci, J. M., Shen, K. L., Reinhorn, A. M., and Soong, T. T. (1993). “Inelastic response of R/C structures with viscoelastic braces.” Earthquake Spectra, 9(3), 419–446.
Lopez, Garcia D., and Soong, T. T. (2002). “Efficiency of a simple approach to daamper allocation in MDOF structures.” J. of Structural Control, 9(1), 19–30.
Makris, N. (1998). “Viscous heating of fluid dampers. I: Small-amplitude motions.” J. Eng. Mech., 124(11), 1210–1216.
Makris, N., Roussos, Y., Whittaker, A. S., and Kelly, J. M. (1998). “Viscous heating of fluid dampers. II: Large-amplitude motions.” J. Eng. Mech., 124(11), 1217–1223.
Mazzoni, S., McKenna, F., Scott, M. H., and Fenves, G. L. (2006). “Open system for earthquake engineering simulation: User command-language manual.” Pacific Earthquake Engineering Research Center, University of California, Berkeley, OpenSees version 1.7.3 users’ manual, ⟨http://opensees.berkeley.edu/OpenSees/manuals/usermanual/index.html⟩ (October 22, 2007).
Mehanny, S. S. F., and Deierlein, G. G. (2000). “Modeling and assessment of seismic performance of composite frames with reinforced concrete columns and steel beams.” Rep. No. 135, The John A. Blume Earthquake Engineering Center, Stanford Univ., Palo Alto, Calif.
Miyamoto, H. K., Determan, L., Gilani, A., and Hanson, R. (2003). “Seismic rehabilitation of historic concrete structure with fluid viscoelastic dampers.” Proc. of 72nd Annual Structural Engineers Association of California Convention, SEAOC, Sacramento, Calif.
National Fire Protection Association, (NFPA). (2006). NFPA 5000: Building construction and safety code, Quincy, Mass.
Nayaran, A. (2005). “A viscohyperelastic device for improved seismic performance of structures.” MS thesis, Virginia Polytechnic Institute, Blacksburg, Va.
Nims, D. K., Richter, P. J., and Bachman, R. E. (1993). “The use of the energy dissipating restraint for seismic hazard mitigation.” Earthquake Spectra, 9(3), 467–489.
Oesterle, M. (2003). “Use of incremental dynamic analysis to assess the performance of steel moment-resisting frames with fluid viscous dampers.” MS thesis, Virginia Tech, Blacksburg, Va.
Pall, A. S., and Marsh, C. (1982). “Seismic response of friction damped braced frames.” J. Struct. Div., 108(6), 1313–1323.
Park, Y. J., Ang, A. H. S., and Wen, Y. K. (1985). “Seismic damage analysis of reinforced concrete buildings.” J. Struct. Eng., 111(4), 740–757.
Patel, H. (2005). “Use of permanent magnets to improve the seismic behavior of light framed structures.” MS thesis, Virginia Polytechnic Institute, Blacksburg, Va.
Pavlou, E., and Constantinou, M. C. (2004). “Response of elastic and inelastic structures with damping systems to near-field and soft-soil ground motions.” Eng. Struct., 26(9), 1217–1230.
Prakash, V., Powell, G. H., and Campbell, S. (1993). DRAIN-2DX base program description and users guide Dept. of Civil Engineering, Univ. of California at Berkeley, Berkeley, Calif.
Rahimian, A., and Romero, E. M. (2003). “Super structure.” Civ. Eng. (N.Y.), 73(6), 21–69.
Ramirez, O. M., Constantinou, M. C., Gomez, J., Whittaker, A. S., and Chrysostomou, C. Z. (2002a). “Evaluation of simplified methods of analysis of yielding structures with damping systems.” Earthquake Spectra, 18(3), 501–530.
Ramirez, O. M., Constantinou, M. C., Kircher, C. A., Whittaker, A., Johnson, M., Gomez, J. D., and Chrysostomou, C. Z. (2001). “Development and evaluation of simplified procedures of analysis and design for structures with passive energy dissipation systems.” Technical Rep. No. MCEER-00–0010, Revision, 1, Multidisciplinary Center for Earthquake Engineering Research, Univ. of Buffalo, State Univ. of New York, Buffalo, N.Y.
Ramirez, O. M., Constantinou, M. C., Whittaker, A. S., Kircher, C. A., and Chrysostomou, C. Z. (2002b). “Elastic and inelastic seismic response of buildings with damping systems.” Earthquake Spectra, 18(3), 531–547.
Ramirez, O. M., Constantinou, M. C., Whittaker, A. S., Kircher, C. A., Johnson, M. W., and Chrysostomou, C. Z. (2003). “Validation of 2000 NEHRP provisions equivalent lateral force and modal analysis procedures for buildings with damping systems.” Earthquake Spectra, 19(4), 981–999.
Reinhorn, A. M., Li, C., and Constantinou, M. C. (1995). “Experimental and analytical investigation of seismic retrofit of structures with supplemental damping. Part i: Fluid viscous damping devices.” Technical Rep. No. NCEER-95–0001, National Center for Earthquake Engineering Research, State Univ. of New York at Buffalo, Buffalo, N.Y.
SAC Joint Venture. (2000). “Recommended seismic evaluation and upgrade criteria for existing welded steel moment-frame buildings.” Rep. No. FEMA-351, Prepared for and published by the Federal Emergency Management Agency, Washington, D.C.
Sadek, F., Mohraz, B., and Riley, M. A. (2000). “Linear procedures for structures with velocity-dependent dampers.” J. Struct. Eng., 126(8), 887–895.
Seleemah, A., and Constantinou, M. C. (1997). “Investigation of seismic response of buildings with linear and nonlinear fluid viscous dampers.” Report No. NCEER 97–0004, National Center for Earthquake Engineering Research, State Univ. of New York at Buffalo, Buffalo, N.Y.
Shao, D., Pall, A., and Soli, B. (2006). “Friction Dampers for seismic upgrade of a 14-story patient tower with a 36-foot tall soft story.” Proc. of 8th U. S. National Conf. on Earthquake Engineering, EERI, Oakland, Calif., Paper No. 90.
Shome, N., Cornell, C. A., Bazzuro, P., and Carballo, J. E. (1998). “Earthquake records and nonlinear responses.” Earthquake Spectra, 14(3), 469–500.
Sigaher, A. N., and Constantinou, M. C. (2003). “Scissor-jack-damper energy dissipation system.” Earthquake Spectra, 19(1), 133–158.
Soong, T. T., and Dargush, G. F. (1997). Passive energy dissipation systems in structural engineering, Wiley, Chichester, U.K.
Soong, T. T., Reinhorn, A. M., Nielsen, E. J., Crosby, P., and Nickerson, H. D. (1998). “Seismic upgrade of a reinforced concrete building using viscoelastic dampers.” Proc., of Structural Engineers World Congress, Elsevier, New York.
Soong, T. T., and Spencer, Jr. B. F. (2002). “Supplemental energy dissipation: State-of-the-art and state-of-the-practice.” Eng. Struct., 24(3), 243–259.
Sorace, S. (1998). “Seismic damage assessment of steel frames.” J. Struct. Eng., 124(5), 531–540.
Symans, M. D., Cofer, W. F., and Fridley, K. J. (2002). “Base isolation and supplemental damping systems for seismic protection of wood structures: Literature review.” Earthquake Spectra, 18(3), 549–572.
Symans, M. D., and Constantinou, M. C. (1998). “Passive fluid viscous damping systems for seismic energy dissipation.” J. of Earthquake Technology, 35(4), 185–206.
Symans, M. D., and Constantinou, M. C. (1999). “Semiactive control systems for seismic protection of structures: A state-of-the-art review.” Eng. Struct., 21(6), 469–487.
Tsopelas, P., Okamoto, S., Constantinou, M. C., Ozaki, D., and Fujii, S. (1994). “NCEER-TAISEI Corporation research program on sliding seismic isolation systems for bridges—Experimental and analytical study of systems consisting of sliding bearings, rubber restoring force devices and fluid dampers.” Rep. No. NCEER 94–0002, National Center for Earthquake Engineering Research, State Univ. of New York at Buffalo, Buffalo, N.Y.
Uang, C., and Bertero, V. V. (1990). “Evaluation of seismic energy in structures.” Earthquake Eng. Struct. Dyn., 19(1), 77–90.
Uriz, P., and Whittaker, A. S. (2001). “Retrofit of prenorthridge steel moment-resisting frames using fluid viscous dampers.” Struct. Des. Tall Build., 10(5), 371–390.
Vamvatsikos, D., and Cornell, C. A. (2002). “Incremental dynamic analysis.” Earthquake Eng. Struct. Dyn., 31(3), 491–514.
Wen, Y. K. (1976). “Method for random vibration of hysteretic systems.” J. Engrg. Mech. Div., 102(2), 249–263.
Whittaker, A. S., Aiken, I. D., Bergman, D., Clark, P. W., Cohen, J., Kelly, J. M., and Scholl, R. E. (1993). “Code requirements for design and implementation of passive energy dissipation systems.” Proc., ATC-17–1 Seminar on Seismic Isolation, Passive Energy Dissipation, and Active Control, Vol. 2, ATC, Redwood City, Calif., 497–508.
Whittaker, A. S., Bertero, V. V., Thompson, C. L., and Alonso, L. J. (1991). “Seismic testing of steel-plate energy dissipating devices.” Earthquake Spectra, 7(4), 563–604.
Whittaker, A. S., Constantinou, M. C., Ramirez, O. M., Johnson, M. W., and Chrysostomou, C. Z. (2003). “Equivalent lateral force and modal analysis procedures of the 2000 NEHRP provisions for buildings with damping systems.” Earthquake Spectra, 19(4), 959–980.
Wongprasert, N., and Symans, M. D. (2004). “Application of a genetic algorithm for optimal damper distribution within the nonlinear seismic benchmark building.” J. Eng. Mech., 130(4), 401–406.
Wu, B., Ou, J. P., and Soong, T. T. (1997). “Optimal placement strategy of energy dissipation devices for three-dimensional structures.” Eng. Struct., 19(2), 113–125.
Xia, C., and Hanson, R. D. (1992). “Influence of ADAS element parameters on building seismic response.” J. Struct. Eng., 118(7), 1903–1918.
Yang, J. N., Lin, S., Kim, J-H., and Agrawal, A. K. (2002). “Optimal design of passive energy dissipation systems based on H and H2 performances.” Earthquake Eng. Struct. Dyn., 31(4), 921–936.

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Go to Journal of Structural Engineering
Journal of Structural Engineering
Volume 134Issue 1January 2008
Pages: 3 - 21

History

Received: Nov 4, 2005
Accepted: Mar 28, 2007
Published online: Jan 1, 2008
Published in print: Jan 2008

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Note. Associate Editor: Sashi K. Kunnath

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M. D. Symans, A.M.ASCE [email protected]
Associate Professor, Dept. of Civil and Environmental Engineering, Rensselaer Polytechnic Institute, 4044 Jonsson Engineering Center, 110 Eighth St., Troy, NY 12180-3590 (corresponding author). E-mail: [email protected]
F. A. Charney, F.ASCE [email protected]
Associate Professor and Director of Center for Extreme Load Effects on Structures, Dept. of Civil and Environmental Engineering, Virginia Polytechnic Institute and State Univ., 200 Patton Hall, Mail Stop 0105, Blacksburg, VA 24061. E-mail: [email protected]
A. S. Whittaker, M.ASCE [email protected]
Professor, Dept. of Civil, Structural, and Environmental Engineering, 230 Ketter Hall, State Univ. of New York at Buffalo, Buffalo, NY 14260-4300. E-mail: [email protected]
M. C. Constantinou, M.ASCE [email protected]
Professor, Dept. of Civil, Structural, and Environmental Engineering, 132 Ketter Hall, State Univ. of New York at Buffalo, Buffalo, NY 14260-4300. E-mail: [email protected]
C. A. Kircher, M.ASCE [email protected]
Principal, Kircher and Associates, 1121 San Antonio Rd., Suite D-202, Palo Alto, CA 94303-4311. E-mail: [email protected]
M. W. Johnson, M.ASCE [email protected]
Technical/Project Manager, ABS Consulting, 300 Commerce Dr., Suite 200, Irvine, CA 92602. E-mail: [email protected]
R. J. McNamara, F.ASCE [email protected]
President, McNamara/Salvia Inc., 160 Federal St., 16th Fl., Boston, MA 02110. E-mail: [email protected]

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