基于地震响应分析的公路挡土结构物抗震动力可靠性  

Aseismic Dynamic Reliability of Highway Soil Retaining Structure Based on Seismic Response Analysis

作　　者：李志强[1] 李金贝[2] 孔亚平[1] 

机构地区：[1]交通运输部科学研究院,北京100029 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《公路交通科技》2011年第12期32-38,共7页Journal of Highway and Transportation Research and Development

基　　金：交通运输部西部交通建设科技项目(200831822196;2009318740099)

摘　　要：提供了一种简单的确定性数值方法,分析在平稳随机地震荷载作用下的结构地震动力响应及动力可靠性。该方法基于有限元动力分析软件,以单位加速度脉冲函数作为地震荷载的输入,当计算出结构的脉冲响应函数后,再运用傅立叶变换得到随机激励和结构响应之间的传递函数,由此来计算结构的均方根响应和峰值响应。基于此方法,分析了挡土结构物在平稳随机地震荷载作用下的抗震动力可靠性,总结了挡土结构物的抗震可靠性的计算方法,并根据此分析方法给出了挡土墙结构抗震可靠性分析的流程,这也为可靠度方法应用于其它岩土领域的抗震设计方面提供了一定的参考。A simple numerical deterministic approach to analyze the dynamic reliability of structure under the action of stationary random seismic action was proposed. The method was based on general FEM software for structure dynamic analysis, and the unit acceleration impulse function was used as the input of seismic load. After the impulse response function of the structure was obtained, the transfer function between the random excitation and response of the structure was adopted to calculate the mean square response and peak response by Fourier transform. On the basis of the proposed method, the dynamic reliability of retaining structure under the action of stationary random seismic action was analyzed, the calculation method of aseismic reliability of retaining structure was summarized, and the process of seismic reliability analysis was given, which could be a reference for application of the reliability method in seismic design in geoteehnical field.

关 键 词：道路工程 挡土结构物 动力可靠性 脉冲响应函数 传递函数 

分 类 号：U417.1[交通运输工程—道路与铁道工程]