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http://dx.doi.org/10.7734/COSEIK.2019.32.6.425

Seismic Behavior of a Bridge with Pile Bent Structures Subjected to Multi-Support Excitation  

Sun, Chang-Ho (Department of Civil and Environmental Engineering, University of Ulsan)
Ahn, Sung-Min (Kunhwa Engineering and Consulting)
Kim, Ick-Hyun (Department of Civil and Environmental Engineering, University of Ulsan)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.32, no.6, 2019 , pp. 425-434 More about this Journal
Abstract
It is important to ensure the seismic safety of pile-bent bridges constructed in areas with thick soft ground consisting of various soil layers against seismic motion in these layers. In this study, several synthetic seismic waves that are compatible with the seismic design spectrum for rock sites were generated, and the ground acceleration history of each soil layer was obtained based on ground analyses. Using these acceleration histories, each soil layer was modeled using equivalent linear springs, and multi-support excitation analyses were performed using the input motion obtained at each soil layer. Due to the nonlinear behavior of the soft soil layers, the intensity of the input ground motion was not amplified, which resulted in the elastic behavior of the bridge. In addition, inputting the acceleration history obtained from a particular layer simultaneously into all the ground springs reduced the response. Therefore, the seismic performance of this type of bridge might be overestimated if multi-excitation analysis is not performed.
Keywords
pile-bent bridge; muti-excitation seismic analysis; equivalent linear spring; fiber model;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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