Seismic Performance and Response of Seismically Isolated Curved Steel I-Girder Bridge
Publication: Journal of Structural Engineering
Volume 142, Issue 12
Abstract
A 0.4-scale model of a three-span, seismically isolated, curved steel I-girder bridge was tested on multiple shake tables. The isolation system consisted of 12 lead-rubber isolators. The bridge is highly curved with total subtended angle equal to 104° (1.8 radians). The objectives of this study were: (1) investigate the effect of curvature on the seismic response of an isolated bridge, (2) evaluate the performance of reinforced concrete (R/C) columns during the design-level earthquake using seismic isolation, and (3) determine the failure limit states of an isolated bridge under extreme shaking. It was found that the horizontal curvature had little effect on the response of the isolators but it did cause asymmetry in the seismic response resulting in higher lateral displacements in the abutment isolators. Elastic performance was achieved in the R/C columns at the design earthquake level, with no concrete spalling in potential plastic hinge zones and only minor surface cracking. Essentially elastic behavior of these columns was observed even at earthquake levels equal to three times the design. Under large earthquake loads, the limit state was found to be excessive displacements in the isolators. Adequate vertical load capacity was maintained even at displacements exceeding the isolator diameter, when they are unstable by first-order theory. Isolator instability at an abutment and a pier did occur at three times the design earthquake, where the isolator shear strain was up to 400%. However, this instability did not cause bridge collapse because the isolators at other supports remained stable and the columns were elastic.
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Acknowledgments
This project was funded by the Federal Highway Administration under Contract DTFH61-07-C-00031: Improving the Seismic Resilience of the Federal Aid Highway System with Dr. Wen-huei Phillip Yen as the Contracting Officer’s Technical Representative.
References
AASHTO. (2008). “AASHTO LRFD bridge design specifications.” Washington, DC.
AASHTO. (2010). “Guide specifications for seismic isolation design.” Washington, DC.
Aiken, I. D., Kelly, J. M., Clark, P. W., Tamura, K., Kikuchi, M., and Itoh, T. (1992). “Experimental studies of the mechanical characteristics of three types of seismic isolation bearings.” Proc., 10th World Conf. on Earthquake Engineering, Madrid, Spain.
Buckle, I. G. (1984). “Factors affecting the performance of lead–rubber energy dissipaters.” Proc., Bridge Design and Research Seminar, Road Research Unit, Wellington, New Zealand, 157–170.
Buckle, I. G., Moustafa, A.-A., and Monzon, E. V. (2011). “Seismic isolation design examples of highway bridges.”, National Cooperative for Highway Research Program (NCHRP), Transportation Research Board, Washington, DC.
Buckle, I. G., Nagarajaiah, S., and Ferrell, K. (2002). “Stability of elastomeric bearings: Experimental study.” J. Struct. Eng., 3–11.
Heins, C. P., and Lee, W. H. (1981). “Curved box girder bridge: Field test.” J. Struct. Div., 107(2), 317–327.
Huang, D. Z. (2004). “Field test and rating of Arlington curved steel box girder bridge.” Transportation Research Board, Washington, DC.
Huang, D. Z. (2008). “Full-scale test and analysis of a curved steel-box girder bridge.” J. Bridge Eng., 492–500.
Imbimbo, M., and Kelly, J. M. (1998). “Influence of material stiffening on stability of elastomeric bearings at large displacements.” J. Eng. Mech., 1045–1049.
Kelly, J. M., and Konstantinidis, D. (2011). Mechanics of rubber bearings for seismic and vibration isolation, Wiley, U.K.
Kikuchi, M., and Aiken, I. D. (1997). “An analytical hysteresis model for elastomeric seismic isolation bearings.” Earthquake Eng. Struct. Dyn., 26(2), 215–231.
McElwain, B. A., and Laman, J. A. (2000). “Experimental verification of horizontally curved I-girder behavior.” J. Bridge Eng., 284–292.
Monzon, E. V., Buckle, I. G., and Itani, A. M. (2013). “Seismic performance of curved steel plate girder bridges with seismic isolation.”, Center for Civil Engineering Earthquake Research, Dept. of Civil and Environmental Engineering, Univ. of Nevada, Reno, NV.
Park, Y. J., Wen, Y. K., and Ang, A. H.-S. (1986). “Random vibration of hysteretic systems under bi-directional ground motions.” Earthquake Eng. Struct. Dyn., 14(4), 543–557.
Richardson, J. A., and Douglas, B. M. (1993). “Results of field testing a curved box girder bridge using simulated earthquake loads.” Earthquake Eng. Struct. Dyn., 22(10), 905–922.
Sanchez, J., Masroor, A., Mosqueda, G., and Ryan, K. (2013). “Static and dynamic stability of elastomeric bearings for seismic protection of structures.” J. Struct. Eng., 1149–1159.
Turnage, R. S., and Baber, T. T. (2009). “Field testing of the wolf creek curved girder bridge: Part I—Vibration tests.”, Federal Highway Administration, Richmond, VA.
Williams, S., and Godden, W. (1979). “Seismic response of long curved bridge structures: Experimental model studies.” Earthquake Eng. Struct. Dyn., 7(2), 107–128.
Yamamoto, S., Kikuchi, M., Ueda, M., and Aiken, I. D. (2009). “A mechanical model for elastomeric isolation bearings including the influence of axial load.” Earthquake Eng. Struct. Dyn., 38(2), 157–180.
Yen, W. P., et al. (2011). “China Earthquake reconnaissance report: Performance of transportation structures during the May 12, 2008, M7.9 Wenchuan Earthquake.”, Federal Highway Administration, McLean, VA.
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Information
Published In
Journal of Structural Engineering
Volume 142 • Issue 12 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Sep 28, 2015
Accepted: Apr 27, 2016
Published online: Jul 7, 2016
Published in print: Dec 1, 2016
Discussion open until: Dec 7, 2016
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