装配式悬挑路基结构的地震响应研究

Research on seismic response of prefabricated cantilever subgrade structures

文章以某装配式悬挑路基结构为工程背景,基于OpenSees(Open System for Earthquake Engineering Simulation,地震工程模拟的开放体系)软件建立3跨装配式悬挑路基结构有限元模型,研究不同连接方式对结构动力特性和非线性时程地震作用下的影响规律。结果表明:不同连接方式对结构主要构件的纵桥向地震响应及风险曲线影响较小,但对结构主要构件横桥向地震响应及风险曲线影响较大;当结构上部固结时,随着结构下部刚度增加,立柱地震需求减小,但锚杆地震需求增加;当结构下部采用装配式连接时,随着结构上部刚度增加,年超越概率增加;当结构上部固结时,随着结构下部刚度增加,年超越概率减小。研究结果可为山区公路建设中的装配式悬挑路基结构设计提供参考。

Based on the engineering background of a prefabricated cantilever subgrade structure,this paper establishes a finite element model of a three-span prefabricated cantilever subgrade structure based on Open System for Earthquake Engineering Simulation(OpenSees)software,and studies the influence of different connection modes on structural dynamic characteristics and nonlinear time-history earthquake action.The results show that different connection modes have little influence on the longitudinal seismic response and risk curve of the main components of the structure,but have great influence on the transverse seismic response and risk curve of the main components of the structure.When the upper part of the structure is consolidated,with the increase of the stiffness of the lower part of the structure,the seismic demand of the column decreases,but the seismic demand of the anchor increases.When the lower part of the structure is assembled,the annual exceedance probability increases with the increase of the stiffness of the upper part of the structure.When the upper part of the structure is consolidated,the annual exceedance probability decreases with the increase of the stiffness of the lower part of the structure.The research results can provide reference for the structural design of prefabricated cantilever subgrade in mountainous highway construction.