土与结构接触特性对地下结构地震反应的影响研究  

Research on the Seismic Responses of Underground Structures Considering the Soil and Structure Contact

作　　者：路德春[1] 王欣[1] 罗磊[1] 杜修力[1] 

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

出　　处：《防灾减灾工程学报》2017年第2期177-186,共10页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51421005;51522802)资助

摘　　要：以大开地铁车站为工程背景,采用数值模拟方法,以中柱层间位移角为评价指标,在弹性土体与弹性结构接触、弹塑性土体与弹性结构接触、弹塑性土体与弹塑性结构接触三种工况下分别计算接触面为绑定、接触面摩擦系数为0.2和0.4时的结构地震反应,同时考虑结构-土体的相对模量对接触特性的影响。提取峰值加速度时刻、峰值位移时刻和峰值速度时刻中结构变形程度最大的时刻,将接触面为摩擦设置时的中柱层间位移角与绑定连接条件下的层间位移角数值进行对比分析。结果表明:当材料力学特性不同时,接触特性对结构反应的影响程度也不同。改变结构的埋深,研究不同围岩约束能力下接触特性对地下结构地震反应的影响,结果表明浅埋时接触特性对地下结构地震反应影响程度较大,深埋时影响程度较小,且对于浅埋结构,峰值加速度时刻为结构地震反应最大时刻,对于深埋结构,峰值位移时刻为结构地震反应最大时刻。Taking the Dakai subway station as an example, the numerical simulation method was used to evaluate the structural responses by interstory drift angle. The structural seismic responses were calculated when the contact surface is binding and the contact friction coefficient is 0.2 and 0. 4 respectively under the three conditions which are the elastic soil contacts with the elastic structure, the elastic-plastic soil contacts with the elastic structure and the elastic-plastic soil con- tacts with the elastic-plastic soil structure. Meanwhile, the relative modulus of soil-structure was changed. The moment of the maximum structural deformation at the instant of peak accelera- tion, peak displacement and peak velocity was extracted to contrast the interlayer displacement angles when the friction coefficient of the contact surface is 0.2 and 0.4 and the binding condi- tion. The results show that the mechanical properties of the material are different, and the influ- ence of the contact characteristics on the structural responses is different. The influence of the contact characteristics on the seismic response of underground structures was analyzed by chan- ging the depth of the structure. The results show that the influence of the contact characteristics on the seismic responses of underground structures is relatively great for shallow-buried structure, the influence is small for deep-buried structure, and the peak acceleration instant is the control time for the shallow-buried structure, while the peak displacement instant is the control time for the deep-buried structure.

关 键 词：地下结构 地震反应 接触非线性 材料非线性 数值模拟 

分 类 号：TU311.3[建筑科学—结构工程]