Seismic fragility analysis of clay-pile-pier systems considering the optimization of ground motion intensity measures  

作　　者：Zhang Panpan Zhang Lei Zhang Zhen 

机构地区：[1]School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Earthquake Engineering and Engineering Vibration》2023年第4期965-977,共13页地震工程与工程振动（英文刊）

基　　金：National Natural Science Foundation of China under Grant Nos.52178353,51808421;the Fundamental Research Funds for the Central Universities(WUT:2020III043)。

摘　　要：The performance of clay-pile-pier system under earthquake shaking was comprehensively examined via three-dimensional finite element analyses,in which the complex stress-strain relationships of a clay and piled pier system were depicted by a hyperbolic-hysteretic and an equivalent elastoplastic model,respectively.One hundred twenty ground motions with varying peak accelerations were considered,along with the variations in bridge superstructure mass and pile flexural rigidity.Comprehensive comparison studies suggested that peak pile-cap acceleration and peak pile-cap velocity are the optimal ground motion intensity measures for seismic responses of the pier and the pile,respectively.Furthermore,based on two optimal ground motion intensity measures and using curvature ductility to quantify different damage states,seismic fragility analyses were performed.The pier generally had no evident damage except when the bridge girder mass was equal to 960 t,which seemed to be comparatively insensitive to the varying pile flexural rigidity.In comparison,the pile was found to be more vulnerable to seismic damage and its failure probabilities tended to clearly reduce with the increment of pile flexural rigidity,while the influence of the bridge girder mass was relatively minor.

关 键 词：clay-pile-pier system seismic fragility analysis ground motion intensity measures damage probability 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]