Effects of Pier and Deck Flexibility on the Seismic Response of Isolated Bridges
Publication: Journal of Bridge Engineering
Volume 11, Issue 1
Abstract
The seismic response of bridges isolated by elastomeric bearings and the sliding system is investigated under two horizontal components of real earthquake ground motions. The selected bridges consist of multispan continuous deck supported on the piers and abutments. Three different mathematical models of the isolated bridge are considered for the analytical seismic response by considering and ignoring the flexibility of the deck and piers. The mathematical formulation for seismic response analysis of various mathematical models of the bridges isolated by different isolation systems is presented. The accuracy and computational efficiency of various mathematical models of isolated bridges is investigated by comparing their responses under different system parameters and earthquake ground motions. The important parameters selected are the flexibility of deck, piers, and isolation systems. There was significant difference in the computational time required for different models, but it was observed that the seismic response of the bridges obtained from different equivalent mathematical models is quite comparable even for an unsymmetrical bridge. Thus, the earthquake response of a seismically isolated bridge can be effectively obtained by modeling it as a single-degree-of-freedom system (i.e., considering the piers and deck as rigid) supported on an isolation system in two horizontal directions.
Get full access to this article
View all available purchase options and get full access to this article.
References
American Association of State Highway and Transportation Officials (AASHTO). (1999). Guide specifications for seismic isolation design, AASHTO, Washington, D.C.
Chaudhary, M. T. A. , Abe, M., Fujino, Y., and Yoshida, J. (2001). “Performance evaluation of base-isolated Yama-age Bridge with high damping rubber bearings using recorded seismic data.” Eng. Struct., 23, 902–910.
Constantinou, M. C. , Kartoum, A., Reinhorn, A. M. , and Bradford, P. (1992). “Sliding isolation system for bridges: Experimental study.” Earthquake Spectra, 8, 321–344.
Federal Emergency Management Agency (FEMA). (1997a). “NEHRP guidelines for the seismic rehabilitation of buildings.” FEMA 273, FEMA, Washington, D.C.
Federal Emergency Management Agency (FEMA). (1997b). “NEHRP guidelines for the seismic rehabilitation of buildings.”FEMA 274, FEMA, Washington, D.C.
Ghobarah, A., and Ali, H. M. (1988). “Seismic performance of highway bridges.” Eng. Struct., 10, 157–166.
Hwang, J. S. , and Chiou, J. M. (1996). “An equivalent linear model of lead-rubber seismic isolation bearings.” Eng. Struct., 18, 528–536.
Hwang, J. S. , and Sheng, L. H. (1994). “Equivalent elastic seismic analysis of base-isolated bridges with lead-rubber bearings.” Eng. Struct., 16, 201–209.
Jangid, R. S. (1996). “Seismic response of sliding structures to bi-directional earthquake excitation.” Earthquake Eng. Struct. Dyn., 25, 1301–1306.
Jangid, R. S. (2004). “Seismic response of isolated bridges.” J. Bridge Eng., 9(2), 156–166.
Jangid, R. S. , and Datta, T. K. (1994). “Nonlinear response of torsionally coupled base isolated structures.” J. Struct. Eng., 120(1), 1–22.
Kartoum, A., Constantinou, M. C. , and Reinhorn, A. M. (1992). “Sliding isolation system for bridges: Analytical study.” Earthquake Spectra, 8, 345–372.
Kikuchi, M., and Aiken, I. (1997). “An analytical hysteresis model for elastomeric seismic isolation bearings.” Earthquake Eng. Struct. Dyn., 26, 215–231.
Koo, G. H. , Lee, J. H. , Yoo, B., and Ohtori, Y. (1999). “Evaluation of laminated rubber bearings for seismic isolation using modified macro-model with parameter equations of instantaneous apparent shear modulus.” Eng. Struct., 21, 594–602.
Kunde, M. C. , and Jangid, R. S. (2003). “Seismic behavior of isolated bridges: A state-of-the-art review.” Electron. J. Struct. Eng., 3, 140–170.
Li, X.-M. (1989). “Optimization of the stochastic response of a bridge isolation system with hysteretic dampers.” Earthquake Eng. Struct. Dyn., 18, 951–964.
Matsagar, V. A. , and Jangid, R. S. (2004). “Influence of isolator characteristics on the response of base-isolated structures.” Eng. Struct., 26, 1735–1749.
Nagarajaiah, S., Reinhorn, A. M. , and Constantinou, M. C. (1991). “Nonlinear dynamic analysis of 3-D-base-isolated structures.” J. Struct. Eng., 117(7), 2035–2054.
Park, Y. J. , Wen, Y. K. , and Ang, A. H. S. (1986). “Random vibration of hysteretic systems under bi-directional motions.” Earthquake Eng. Struct. Dyn., 14, 543–557.
Tongaonkar, N. P. , and Jangid, R. S. (2003) “Seismic response of isolated bridges with soil-structure-interaction.” Soil Dyn. Earthquake Eng., 23, 287–302.
Tsopelas, P., Constantinou, M. C. , Kim, Y. S. , and Okamota, S. (1996). “Experimental study of FPS system in bridge seismic isolation.” Earthquake Eng. Struct. Dyn., 25, 65–78.
Tsopelas, P. C. , Constantinou, M. C. , and Reinhorn, A. M. (1994). “3D-BASIS-ME: Computer program for nonlinear dynamic analysis of seismically isolated single and multiple structures and liquid storage tanks.” Technical Report NCREER-94-0010, State Univ. of New York at Buffalo, Buffalo, N.Y.
Turkington, D. H. , Cooke, N., Moss, P. J. , and Carr, A. J. (1989). “Development of design procedure for bridges on lead-rubber bearings.” Eng. Struct., 11, 3–8.
International Conference of Building Officials (ICBO). (1997). Uniform building code, ICBO, Whilter, Calif.
Wang, Y. P. , Chung, L., and Wei, H. L. (1998). “Seismic response analysis of bridges isolated with friction pendulum bearings.” Earthquake Eng. Struct. Dyn., 27, 1069–1093.
Zayas, V. A. , Low, S. S. , and Mahin, S. A. (1990). “A simple pendulum technique for achieving seismic isolation.” Earthquake Spectra, 6, 317–333.
Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 11 • Issue 1 • January 2006
Pages: 109 - 121
Copyright
© 2006 ASCE.
History
Received: Feb 12, 2004
Accepted: Apr 15, 2005
Published online: Jan 1, 2006
Published in print: Jan 2006
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.