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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 58
Edited by: B.H.V. Topping and B. Kumar
Paper VII.2

Elastic-Plastic Seismic Behaviours of Elevated Steel Bridges under Strong Ground Motions

W.X. Ren* and M. Obata+

*Civil Engineering Department, Changsha Railway University, Changsha, Peoples Republic of China
+Civil Engineering Department, Nagoya Institute of Technology, Nagoya, Japan

Full Bibliographic Reference for this paper
W.X. Ren, M. Obata, "Elastic-Plastic Seismic Behaviours of Elevated Steel Bridges under Strong Ground Motions", in B.H.V. Topping, B. Kumar, (Editors), "Computer Techniques for Civil and Structural Engineering", Civil-Comp Press, Edinburgh, UK, pp 103-110, 1999. doi:10.4203/ccp.58.7.2
The paper is intended to investigate the effects of different strong ground motions, different structural properties (natural frequencies) and three-dimensional inputs on the elastic-plastic seismic behavior of elevated highway steel bridges. Two different strong earthquake records of the Great Hanshin Earthquake and three structural cases are used in the paper. In order to evaluate possible bridge damages (irrecoverable deformations) subjected to seismic loadings, a new kind of ductility index named Maximum Plastic Strain Ductility Ratio is proposed. The spectral analyses of acceleration responses have indicated the validity of the index. The numerical results show that the elastic-plastic seismic response behavior of elevated steel bridges depend not only on the characteristics of input ground motions and three-dimensional inputs but also strongly on the structural dynamic properties.

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