高烈度软土场地桥梁地震与冲刷联合作用效应研究

周敉1,赵威2,石雄伟3,朱国强1

振动与冲击 ›› 2020, Vol. 39 ›› Issue (8) : 88-98.

PDF(1939 KB)
PDF(1939 KB)
振动与冲击 ›› 2020, Vol. 39 ›› Issue (8) : 88-98.
论文

高烈度软土场地桥梁地震与冲刷联合作用效应研究

  • 周敉1,赵威2,石雄伟3,朱国强1
作者信息 +

A study on combined effect of earthquake and scour of bridge in high earthquake-intensity and soft soil site

  • ZHOU Mi1,ZHAO Wei2,SHI Xiongwei3,ZHU Guoqiang1
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文章历史 +

摘要

冲刷会导致桥梁基础裸露,土体对桩基的约束作用减弱,使得桥梁基础在地震作用下的危险性增大,因此建立冲刷与地震联合作用下桥梁的失效概率模型,分析震区连续刚构桥冲刷作用组合分项系数具有重要的意义。以地震基本烈度Ⅷ度区某连续刚构桥为依托工程,基于Monte-Carlo法确定冲刷深度的分布函数,并采用CSIBridge有限元软件建立不同冲刷深度下全桥空间有限元动力模型,进行48条地震波下的增量动力分析(IDA),计算不同冲刷深度的地震作用效应分布函数,并采用直接积分法求得桥梁基础的失效概率及可靠度指标。研究结果表明:通过冲刷与地震的联合作用框架下失效概率分析,可建立冲刷深度与失效概率的非线性关系;该方法可合理确定冲刷与地震作用组合下荷载组合分项系数,可为桥梁在冲刷与地震联合作用下的风险评估和设计提供参考。

Abstract

Scour leads bridge foundation to be exposed, which weakens the constraint function of soil to the pile foundation and increases the damage risk of the foundation under earthquake.Therefore, it is significant to establish the failure probability model of a bridge under the combined effect of scour and earthquake, and to analyze the combined component coefficient of the scour action of the continuous rigid frame bridges in an earthquake zone.In this paper, based on a continuous rigid frame bridge built in the area with seismic basic intensity of VIII degree, the distribution function of the scour depth was determined by the Monte-Carlo method, and the dynamic finite element models of the entire bridge under different scouring depth were established by CSIBridge software.Forty-eight seismic waves were used for incremental dynamic analysis (IDA), and the distribution function of seismic action effects with different scouring depth was calculated.The failure probability and reliability index of bridge foundation at different scouring depths were obtained by the direct integration method.The results show that the nonlinear relationship between the scouring depth and the earthquake failure probability can be established by the failure probability analysis under the framework of combined effect of erosion and earthquake.This method can reasonably determine the partial combination coefficient of loading combination including erosion and seismic action.

关键词

地震 / 冲刷 / 失效概率 / 分项系数 / 联合作用

Key words

earthquake / scour / partial coefficient / failure probability / combined effect

引用本文

导出引用
周敉1,赵威2,石雄伟3,朱国强1. 高烈度软土场地桥梁地震与冲刷联合作用效应研究[J]. 振动与冲击, 2020, 39(8): 88-98
ZHOU Mi1,ZHAO Wei2,SHI Xiongwei3,ZHU Guoqiang1. A study on combined effect of earthquake and scour of bridge in high earthquake-intensity and soft soil site[J]. Journal of Vibration and Shock, 2020, 39(8): 88-98

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