Seismic fragility curves of bridge piers accounting for ground motions in Korea

2nd International Conference on Sustainable Development in Civil, Urban and Transportation Engineering

地球科学;运输工程;经济学

Nguyen, Duy-Duan^1,2 ; Lee, Tae-Hyung^1

Department of Civil Engineering, Konkuk University, Seoul

05029, Korea, Republic of^1

Department of Civil Engineering, Vinh University, Vinh

461010, Viet Nam^2

关键词: Base-isolated bridges;    Column displacements;    Earthquake magnitudes;    Existing structure;    Finite element simulations;    Nonlinear time history analysis;    Seismic fragility curves;    Seismic vulnerability;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/143/1/012029/pdf
DOI  :  10.1088/1755-1315/143/1/012029

来源: IOP

【 摘 要 】

Korea is located in a slight-to-moderate seismic zone. Nevertheless, several studies pointed that the peak earthquake magnitude in the region can be reached to approximately 6.5. Accordingly, a seismic vulnerability evaluation of the existing structures accounting for ground motions in Korea is momentous. The purpose of this paper is to develop seismic fragility curves for bridge piers of a steel box girder bridge equipped with and without base isolators based on a set of ground motions recorded in Korea. A finite element simulation platform, OpenSees, is utilized to perform nonlinear time history analyses of the bridges. A series of damage states is defined based on a damage index which is expressed in terms of the column displacement ductility ratio. The fragility curves based on Korean motions were thereafter compared with the fragility curves generated using worldwide earthquakes to assess the effect of the two ground motion groups on the seismic fragility curves of the bridge piers. The results reveal that both non- and base-isolated bridge piers are less vulnerable during the Korean ground motions than that under worldwide earthquakes.