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使用了结构动力学有关理论,研究了当竖向地震发生时双层双跨地下结构上下两层中柱的动力响应。为了解决问题的简便,首先可以将地下结构作为刚体来研究,利用土—地下结构之间的相互作用获得刚体在竖向地震作用下的动力响应。然后,利用地下结构的对称性,取一半地下结构来进行研究计算,侧墙与底板、顶板的约束使用抗弯弹簧替换。之后,利用边界条件可以把刚体动力响应输入顶板和底板中,以便获得底板和顶板的剪力,最后得到上下两层中柱的受力情况。结果表明,竖向地震作用对双层地下结构上下两层中柱的作用是比较明显的,并有可能对地下结构中柱产生严重的破坏,同时下层中柱相比于上层中柱的竖向作用更加明显。
Using the theory of structural dynamics, the dynamic response of the two upper and lower columns in a double-storey double-deck subsurface structure is studied when a vertical earthquake occurs. In order to solve the problem simply, the underground structure can be studied as a rigid body and the dynamic response of the rigid body under vertical earthquake can be obtained by the interaction between soil and underground structure. Then, using the symmetry of the subsurface structure, take half of the underground structure to carry out research and calculation, the constraints of the side wall and the floor, the roof is replaced by the bending spring. Then, using the boundary conditions, the dynamic response of the rigid body can be input into the top plate and the bottom plate so as to obtain the shear force of the bottom plate and the top plate, and finally the stress of the upper and lower two columns is obtained. The results show that the effect of vertical seismic action on the two upper and lower layers of double-story subsurface structures is more obvious and may cause serious damage to the columns in the subsurface structure. Meanwhile, The role is more obvious.