考虑PSI的深水高墩大跨桥梁地震易损性分析

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摘要以某深水高墩大跨连续刚构桥梁为工程背景，考虑桩-土相互作用（PSI）、动水压力以及二者联合作用效应的影响，基于OpenSEES源代码分析平台建立有限元模型，随机选取100条近场地震波来考虑地震动输入的不确定性，以峰值地面速度（PGV）作为地震动强度参数，然后分别以墩顶、墩底曲率以及支座相对位移作为损伤指标，建立了桥梁不同构件的概率地震需求模型和地震易损性曲线，对深水桥梁的抗震性能进行了分析和评估。研究结果表明：深水桥梁的动水压力效应会增大桥墩的地震失效概率，但支座的失效概率会略有降低；考虑桩-土相互作用时墩底截面和支座的失效概率会有所减小，但墩顶的失效概率会有所增加；动水压力和桩-土相互作用均对支座易损性的影响相对较小；动水压力对高墩桥梁易损性的影响比桩-土相互作用要大。

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	吴文朋1
	2
	梁鹏2
	3
	龙士国2
	张旭辉2

关键词 ：高墩大跨桥梁, 近场地震, 地震易损性, 动水压力, 桩-土相互作用

Abstract：A certain high-pier long-span continuous rigid frame bridge in deep water was taken as engineering background,considering effects of pile-soilinteraction (PSI), dynamic water pressure and their joint action effect,the finite element analysis model for the bridge was built based on OpenSEES source code analysis platform. 100 near-field earthquake wave records were randomly selected to consider the uncertainty of seismic input, and the peak ground velocity (PGV) was chosen as the seismic intensity parameter. Then, curvatures of both top and bottom of high-pier, and relative displacements of supports were taken as damage indexes to establish probabilistic seismic demand models and seismic fragility curves for the bridge’s different components, and analyze and estimate the seismic performance of the bridge in deep water. The study results showed that dynamic water pressure effect of the bridge in deep water can increase seismic failure probabilities of bridge piers, but failure probabilities of supports can drop slightly; when considering PSI, failure probabilities of pier bottoms and supports can be reduced, but failure probabilities of pier topscan grow; dynamic water pressure and PSI have relatively smaller effects on support vulnerability; effects of dynamic water pressure on the vulnerability of high-pier bridgesare greater than those of PSI.

Key words： high-pier long-span bridge near-field earthquake seismic fragility dynamic water pressure pile-soilinteraction (PSI)

收稿日期: 2018-11-01 出版日期: 2020-09-28

引用本文:

吴文朋1,2，梁鹏2,3，龙士国2，张旭辉2. 考虑PSI的深水高墩大跨桥梁地震易损性分析[J]. 振动与冲击, 2020, 39(19): 210-217.
WU Wenpeng1,2, LIANG Peng2,3, LONG Shiguo2, ZHANG Xuhui2. Seismic fragility analysis for high-pier and long-span bridges in deep water considering pile-soil interaction. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(19): 210-217.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2020/V39/I19/210

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