Seismic Fragility of Multispan Simply Supported Bridge with Drop Spans and Steel Bearings
Publication: Journal of Bridge Engineering
Volume 20, Issue 12
Abstract
Multispan simply supported bridges with drop spans and steel bearings were commonly constructed in northern India during the 1970s, and little knowledge about their seismic behavior is available in the literature. Because these bridges are part of the existing transportation network, it is important to assess their seismic fragility and suggest possible retrofitting solutions, if required. A four-span model of such a bridge type was analytically investigated for its seismic response. The critical components of such bridges are rocker and roller-cum-rocker steel bearings, and their lateral force–deformation responses were obtained from nonlinear finite-element analyses. Incremental dynamic analyses were performed for the development of fragility curves for failure of the bridge along two horizontal directions. The damage criteria included either failure of bearings due to exceedance of respective displacement limits or dislodgement of the bridge deck due to unseating. It was observed that seismic demands for drop spans were small, and failure of main-span steel bearings was the primary cause for the bridge failure. Retrofitting of the bridge by replacing steel bearings with unanchored elastomeric pads is shown to significantly reduce the fragility of the retrofitted bridge.
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Acknowledgments
The authors gratefully acknowledge financial support from the Poonam & Prabhu Goel Foundation at IIT Kanpur for research and outreach activities in earthquake engineering. The authors greatly appreciate Vaibhav Singhal, doctoral scholar, for valuable discussion and assistance in revising the manuscript.
References
BIS (Bureau of Indian Standards). (2002). “Criteria for earthquake resistant design of structures—General provisions and buildings.” IS-1893: Part-1, New Delhi, India.
Caltrans. (2010). Seismic design criteria, Sacramento, CA.
Choi, E., DesRoches, R., and Nielson, B. (2004). “Seismic fragility of typical bridges in moderate seismic zones.” Eng. Struct., 26(2), 187–199.
CSI (Computers and Structures, Inc.). (2009). SAP2000, integrated finite element analysis and design of structures, analysis reference manual, Univ. of California, Berkeley, CA.
Elnashai, A. S., Borzi, B., and Vlachos, S. (2004). “Deformation-based vulnerability functions for RC bridges.” Struct. Eng. Mech., 17(2), 215–244.
FEMA. (2000). “Prestandard and commentary for the seismic rehabilitation of buildings.” Rep. No. FEMA-356, Washington, DC.
FEMA. (2009). “Quantification of building seismic performance factors.” Rep. No. FEMA-P695, Washington, DC.
Hwang, H., Liu, J., and Chiu, Y. (2001). “Seismic fragility analysis of highway bridges.” Technical Rep., Center for Earthquake Research and Information, Univ. of Memphis, Memphis, TN.
IRC (Indian Road Congress). (1987). “Standard specifications and code of practice for road bridges, Section IX: Bearings—Metallic bearings.” IRC-83: Part 1&2, New Delhi, India.
IRC (Indian Road Congress). (2000). “Standard specifications and code of practice for road bridges, Section III: Cement concrete—Plain and reinforced.” IRC-21, New Delhi, India.
IRC (Indian Road Congress). (2010). “Standard specifications and code of practice for road bridges, Section II: Loads and stresses.” IRC-6, 5th Ed., New Delhi, India.
Karim, K. R., and Yamazaki, F. (2000). “Comparison of empirical and analytical fragility curves for RC bridge piers in Japan.” 8th Specialty Conf. on Probabilistic Mechanics and Structural Reliability (CD-ROM), Paper No. PMC 2000-050, ASCE, Reston, VA.
Mackie, K., and Stojadinovic, B. (2003). “Seismic demands for performance based design of bridges.” PEER 2003/16, Pacific Earthquake Engineering Research Center, Univ. of California, Berkeley, CA.
Mander, J. B., Kim, D. K., Chen, S. S., and Premus, G. J. (1996). “Response of steel bridge bearings to reversed cyclic loading.” Rep. No. NCEER-96-0014, National Center for Earthquake Engineering Research, Buffalo, NY.
Mazroi, A., Wang, L. R. L., and Murray, T. M. (1982). “Effective coefficient of friction of bridge bearings.” Final Rep., Fears Structural Engineering Laboratory, School of Civil Engineering and Environmental Science, Univ. of Oklahoma, Oklahoma.
MOST (Ministry of Surface Transport). (1991). “Standard drawings for Road Bridges.” DRG. No. SD/204 (sh-1), Government of India, New Delhi, India.
Nateghi, F., and Shahsavar, V. L. (2004). “Development of fragility and reliability curves for seismic evaluation of a major pre-stressed concrete bridge.” 13th World Conf. on Earthquake Engineering, Paper No. 1351, Canadian Association of Earthquake Engineering (CAEE), Canada and International Association of Earthquake Engineering (IAEE), Tokyo.
Pan, Y., Agrawal, A. K., and Ghosan, M. (2007). “Seismic fragility of continuous steel highway bridges in New York State.” J. Bridge Eng., 689–699.
Pan, Y., Agrawal, A. K., Ghosan, M., and Alampalli, S. (2010). “Seismic fragility of multispan simply supported steel highway bridges in New York State. II: Fragility analysis, fragility curves, and fragility surfaces.” J. Bridge Eng., 462–472.
SIMULIA. (2010). Abaqus user’s manual, version 6.10, Providence, RI.
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Published In
Journal of Bridge Engineering
Volume 20 • Issue 12 • December 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Mar 11, 2014
Accepted: Jan 23, 2015
Published online: May 2, 2015
Discussion open until: Oct 2, 2015
Published in print: Dec 1, 2015
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