Effects of Live Load on Seismic Response of Bridges: A Preliminary Study
Keywords:Live load, seismic response, large-scale, multiple shake tables, horizontally curved bridges.
AbstractAlthough 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.
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.
How to Cite
LicenseAuthors who publish with this journal agree to the following terms:
- Authors retain the copyright and publishing right, and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) followingthe publication of the article, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).