浅埋单层三跨地下结构在竖向地震作用下的动力响应  

Dynamic Response of Mid-Pillar Under Vertical Seismic Excitation in Treble-Span Shallowly Buried Underground Structure

作　　者：杨谨瑞 戚承志[1] 魏小琨 刘天添 

机构地区：[1]北京建筑大学土木与交通工程学院北京市高校工程结构与新材料工程研究中心,北京100044

出　　处：《北京建筑大学学报》2016年第1期42-45,79,共5页Journal of Beijing University of Civil Engineering and Architecture

基　　金：国家自然科学基金项目(51174012;51174012);北京市属高等学校创新团队建设与教师职业发展计划项目(IDHT20130512);国家重点基础研究发展计划(973)项目(2015CB0578005)

摘　　要：采用结构动力学方法,通过求解地下结构顶板的动力响应得到了单层三跨地下结构中柱在竖向地震分量作用下的动力响应.地下结构首先被看作是刚体,利用与地基的相互作用得到地下结构在竖向地震分量作用下的动力响应.其次,由于地下结构的对称性,取一半进行简化分析,侧墙对于顶板的约束用抗弯弹簧代替.再次,根据边界条件将之前的刚体动力响应作为输入,可以求得顶板的剪力.最后,通过之前求得的顶板剪力进而求得中柱的受力情况.结果表明,竖向地震分量对中柱的作用是显著的,甚至会对地下结构中柱产生严重的破坏.Using the structural dynamics method the dynamic response of mid-pillar under vertical seismic excitation in treble-span shallowly buried underground structure is gained by solving dynamic response of underground structure roof slab. Firstly,underground structure is treated as rigid body and the dynamic response of structure under vertical seismic excitation is obtained by analyzing the interaction between rigid body and foundation. Secondly,due to the symmetry of the underground structure,half of the structure is taken into consideration. Bending restraint of side wall which is replaced by bending spring is taken into consideration. Shear forces of roof slab is obtained by inputting the dynamic response of the rigid body obtained previously as boundary condition of roof slab. Finally,the stress of mid-pillar is obtained. The results show that the effect of vertical seismic excitation is significant for mid-pillar,even causes serious damage for the mid-pillar of underground structure.

关 键 词：竖向地震分量 单层三跨 中柱 动力响应 

分 类 号：P315.9[天文地球—地震学] TU435[天文地球—固体地球物理学]