地裂缝对不同刚度筏板基础框-剪结构影响的有限元分析

Finite element analysis of the influence of ground crack on the foundation frame of different stiffness raft

为了分析地裂缝影响区内建筑结构的安全性能,采用有限元法对位于不同避让距离的结构进行弹性分析,以支座位移法模拟地裂不均匀沉降对结构的作用,着重分析了不同刚度筏板基础框-剪结构在地裂不均匀沉降单独工况下的底层结构内力及变形情况。结果表明:不同刚度筏板基础框-剪结构最大层间位移角均在避让距离15 m以外满足限值要求,结构底层构件内力最大值出现在避让距离11~15 m区间,框-剪结构可由原规程中最小避让距离20 m向地裂缝推进为15 m。

In order to analyze safety performance of structures in ground fracture area,the support displacement method was used to analog the uneven ground subsidence of ground fracture,and the research methods of finite element analysis was used to study the internal force and deformation of different raft foundation stiffness frame-shear wall under the separate action of conditions of differential settlement of the ground fissures through structure elastic analysis in different avoidance distances.The results showed that maximum interlayer displacement angle of different stiffness raft foundation frame-shear structure meet the requirement of limit value from 15 m.The maximum internal force of the underlying structural components appeared in the range of 11-15 m,the frame-shear structure can be promoted to 15 m by the minimum distance from 20 m in the original code.