液化场地-群桩-上部结构动力相互作用简化分析方法  

Simplified analysis method for dynamic interaction of liquefiedsite-group pile-superstructure

作　　者：许成顺[1] 戴金 豆鹏飞 宋佳 孙毅龙 贾科敏 XU Chengshun;DAI Jin;DOU Pengfei;SONG Jia;SUN Yilong;JIA Kemin(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;School of Civil Engineering,North China University of Technology,Beijing 100144,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]北方工业大学土木工程学院,北京100144

出　　处：《地震工程与工程振动》2020年第6期25-35,共11页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金优秀青年基金项目(51722801);国家自然科学基金创新研究群体项目科学基金项目(51421005)。

摘　　要：基于已完成的液化场地-群桩基础-上部结构体系动力相互作用大型振动台模型试验,采用API规范推荐的p-y曲线模型,将液化自由场动力分析得到的土体位移时程和孔压比时程作为简化分析模型的外部输入条件,在OpenSees有限元平台中建立了液化场地-群桩-上部结构系统动力相互作用简化分析模型。模型综合考虑了地震荷载作用下的砂土液化效应、群桩效应以及承台与土之间的动力相互作用。基于建立的简化分析模型,分析地震荷载作用下液化场地-群桩-上部结构系统中桩基和上部结构的动力响应,并与振动台模型试验结果进行对比。对比表明,两者结果均较为吻合,验证了本文数值建模过程以及所提出的简化分析方法的可靠性。The simplified numerical model of dynamic interaction based onthe completed large-scale shaking table test of the liquefaction site-group pile-superstructure and the p-y curve model recommended by the API specification wascreated in the OpenSees software platform,in which the soil displacement time history and pore pressure ratio time history obtained from the dynamic analysis of the liquefiable free field was used as the boundary condition.The effect of sand liquefaction,the effect of group,and soil-cap dynamic interaction wascomprehensivelyconsidered in simplified model,by whichthe paperanalyzed the dynamic responses of the pile foundation and the superstructure under seismic load.The comparison results from the simplified numerical model and the shaking table test indicates that the results of the simplified analysis model are in good agreement with the experimental results,and the reliability of the simplified analysis method proposed in this paper was verified.

关 键 词：液化场地 群桩基础 桩-土动力相互作用 p-y曲线模型 简化分析方法 

分 类 号：TU435[建筑科学—岩土工程]