筏板基础中柱节点冲切有限元分析  

FEA of Raft Foundation Central Column Node under Combined Action of Vertical Load and Unbalanced Moment

作　　者：杜永峰[1] 邱志涛[1] 

机构地区：[1]兰州理工大学防震减灾研究所,甘肃兰州730050

出　　处：《甘肃科学学报》2007年第4期125-128,共4页Journal of Gansu Sciences

基　　金：甘肃省科技攻关项目(GS022-A52-063)

摘　　要：考虑筏板基础和地基共同作用,运用ADINA有限元计算方法分析了筏板基础中柱节点在竖向荷载与不平衡弯矩共同作用下的冲切性能、破坏规律及筏板底部地基反力的分布情况.计算及分析结果表明:由于地基反力作用,筏板的破坏主要是以冲切破坏为主;由于不平衡弯矩的影响筏板中抗弯钢筋的屈服现象以及地基反力最大值都出现在筏板受弯方向的区域里,并且地基反力的分布基本呈抛物线分布;筏板中抗弯钢筋对提高筏板冲切承载力有重要作用,因此在设计中应考虑抗弯钢筋的作用而使工程更加经济.Considering the interaction of raft foundation and ground base , using the finite element calculation method of ADINA to analyze the punching shear performance , failure law of raft foundation central column and distribution state of ground base reaction force of the bottom of raft slab under combined action of vertical load and unbalanced moment. Results show that the action of ground base reaction force , the failure of raft foundation is punching shear failure mainly , and with the influence of unbalanced moment , the yield phenomenon of bending resistance steel bar in the raft foundation as well as the maximum value of ground base reaction force both appear in the zone of bending direction of raft foundation , and the distribution of ground base reaction force presents in para--curve basically , and the bending resistance steel bar in the raft foundation has great impact on increasing punching shear bearing capacity of raft foundation. So we should consider the role of bending resistance steel bar so as to make the project more economy in designing.

关 键 词：筏板基础 不平衡弯矩 有限元分析 配筋率 冲切 

分 类 号：TU375.2[建筑科学—结构工程] TU311