框支剪力墙土-结构共同作用的抗震性能分析

采用有限元法对一框支剪力墙土-结构体系进行动力弹塑性时程分析。通过对计算模型的自振特性以及地震作用下的位移、层间位移角、等效刚度比和剪力等数据进行分析研究。研究结果表明:运用ANSYS建立框支剪力墙-土-结构共同作用模型对结构进行地震反应分析,能够真实地反映结构的抗震性能。转换层位置对结构自振周期影响较小;转换层附近的层间位移角和剪力均发生突变,且随转换层位置的提高而加剧;层间位移角较大值集中在结构中上部;框支柱剪力最大值发生在转换层中柱。建议抗震设计时,转换层位置可适当提高但不宜超过5层,等效侧向刚度比宜控制在0.8～1.3,除了底部框支柱加强外,还应该对中上部楼层采取减小层间位移的措施,对转换层中柱采取特殊加强。

Antiseismic performance analysis for co-interaction of soil-structure of frame-supported shear wall

A finite element elasto-plastic time-history analysis was conducted on the interaction system of soil-structure of frame-supported shear wall.The data of free vibration characteristics of models and the displacement,inter-storey drift angle,the ratio of equivalent lateral stiffness and shear force under earthquake were studied.The results show that,using models built in ANSYS to analyze the seismic response of SSI structure of frame-supported shear wall can efficiently reflect the seismic performance of structure.The location of conversion floor has little effect on the natural period of vibration mode.The drift angle and shear near conversion layer had mutations,which intensified with the increase of conversion layer position.The higher the level of transfer stories,the larger the ratio of equivalent lateral stiffness is.The larger inter-storey drift angle of structure occurs in middle-upper part.The maximum shear force of columns appears in the middle columns on transfer storey.The height of transfer storey can be set a little higher properly but not more than 5 layer in design.The ratio of equivalent lateral stiffness should be ranged between 0.8 and 1.3.Not only should the frame-supporting columns be particularly strengthened,but also some measures should be taken to decrease the story drift in middle-upper part of structure.