Aspects of bridge-ground seismic response and liquefaction-induced deformations |
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| Authors: | Zhijian Qiu Ahmed Ebeido Abdullah Almutairi Jinchi Lu Ahmed Elgamal P Benson Shing Geoffrey Martin |
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| Institution: | 1. Department of Structural Engineering, UC San Diego, La Jolla, CA;2. Jacobs Engineering, Irvine, CA;3. Department of Civil Engineering, Kuwait University, Kuwait City, Kuwait;4. Department of Civil Engineering, USC, Los Angeles, CA |
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| Abstract: | Considerable bridge-ground interaction effects are involved in evaluating the consequences of liquefaction-induced deformations. Due to seismic excitation, liquefied soil layers may result in substantial accumulated permanent deformation of sloping ground near the abutments. Ultimately, global response is dictated by the bridge-ground interaction as an integral system. However, a holistic assessment of such response generally requires a highly demanding full three-dimensional (3D) model of the bridge and surrounding ground. As such, in order to capture a number of the salient involved mechanisms, this study focuses on the longitudinal seismic performance of a simpler idealized configuration, motivated by details of an existing bridge-ground configuration. In this model, a realistic multilayer soil profile is considered with interbedded liquefiable/nonliquefiable strata. The effect of the resulting liquefaction-induced ground deformation is explored. Attention is given to overall deformation of the bridge structure due to lateral spreading in the vicinity of the abutments. The derived insights indicate a need for such global analysis techniques, when addressing the potential hazard of liquefaction and its consequences. |
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| Keywords: | bridge finite element lateral spreading liquefaction seismic soil-structure interaction |
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