Effects of Live Load on Seismic Response of Bridges: A Preliminary Study
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https://doi.org/10.9744/ced.14.3.166-172Keywords:
Live load, seismic response, large-scale, multiple shake tables, horizontally curved bridges.Abstract
Although live load is well known to have a dynamic effect on bridge response in addition to its self-weight, the significance of these effects on seismic response is unclear. In addition, most bridge design specifications have few requirements concerning the inclusion of live load in their seismic design provisions. The main objective of this study is therefore to investigate and obtain insight into the effect of vehicle-bridge interaction during earthquake shaking. The study consists of both experimental and analytical investigations. This paper focuses on the experimental work, which includes shake table testing of a 2/5-scale model of a horizontally curved steel girder bridge loaded with a series of representative vehicles. Preliminary experimental results show that the presence of the live load had a clear beneficial effect on performance for small amplitude motions, but that this improvement diminished with increasing amplitude of shaking. Parameters used to measure performance include column displacements, abutment shear forces, abutment uplift, and concrete spalling.References
AASHTO, AASHTO LRFD Bridge Design Specifications, Customary U.S. Units, 6th Edition, Washington, DC: AASHTO, 2012.
Kameda, H., Murono, Y., Maekawa, Y. and Sasaki, N., Dynamic Structure-Vehicle Interac-tion for Seismic Load Evaluation of Highway Bridges. Proceedings of the Tenth World Conference on Earthquake Engineering, Madrid, Spain, July 19-24, 1992, pp. 4861-4866.
Kawashima, K., Unjoh, S. and Mukai, H., Research on Live Load Effect to Earthquake Response of Bridges (Part 1), PWRI Research Report No. 3316, 59 pp. (In Japanese), 1994.
Kawatani, M., Kim, C.W. and Yasui, K., Seismic Response of a Highway Bridge under Traffic Loadings, Proceedings of Pacific Structural Steel Conference 2007: Steel Structures in Natural Hazards, Wairakei, New Zealand, March 13-16, 2007, pp. 183-188.
Kim, C.W., Kawatani, M., Konaka, S. and Kitaura, R., Seismic Responses of a Highway Viaduct Considering Vehicles of Design Live Load as Dynamic System during Moderate Earthquakes, Structure and Infrastructure Engineering, 7(7-8), 2011, pp. 523-534. [CrossRef]
Otsuka, H., Unjoh, S. and Mukai, H., Research on Live Load Effect to Earthquake Response of Bridges (Part 2). PWRI Research Report No. 3355, 40 pp. (In Japanese), 1999.
Scott, M.H., Combined Seismic Plus Live Load Analysis of Highway Bridges, Report OTREC-RR-09-261. Portland: Oregon Transportation Research and Education Consortium, 2010.
Sugiyama, I., Kameda, H., Sasaki, N., and Kawa-kita, S., Dynamic Structure-Vehicle Interaction of Highway Bridges and Its Implication to Seismic Design. Proceedings of the 6th U.S.-Japan Bridge Engineering Workshop, Lake Tahoe, NV, May 7-8, 1990, pp. 379-392.
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