边柱下预应力筏板基础考虑应力扩散作用的抗冲切承载力计算  

Calculation of Punching Shear Capacity of Prestressed Raft Foundation under Border Column Based on Stress Diffusion

作　　者：姚荣[1] 朱平华[1] 

机构地区：[1]扬州科技学院土木工程系,江苏扬州225009

出　　处：《建筑科学》2009年第11期40-45,共6页Building Science

基　　金：江苏省"青蓝工程"基金资助项目(苏教师(2007)2号);扬州市科技计划项目(YZ2007048-3);扬州科技学院科研基金项目(07Z13)

摘　　要：锚下预应力筋对筏板基础产生的水平预压应力的计算,关系到有效预压应力的计算和筏板的抗冲切设计,现行混凝土结构设计规范有关预压应力的计算公式没有考虑预应力在锚下的扩散问题。文中分析了锚下预压力作用下筏板的应力分布规律。基于级数法的思想,导出预应力筏板的预压应力理论解并讨论边柱有效预压应力计算问题。在考虑应力扩散的影响对抗剪有效作用下,提出了预应力筏板基础边柱合理的抗冲切承载力计算公式。Compressive stress produced by horizontal prestressing tendons within the raft foundation has much to do with the effective prestress and punching shear capacity. In current Chinese specification, however, the calculation of such compressive stress does not consider the prestressing diffusion phenomena. Stress regularities of distribution in the prestressed raft were analyzed with focus on prestressing. Based on the progression thought, the paper discusses the approximate solution of horizontal prestresses and the calculation method for the compressive stress of the raft under the border column. Rational formula of border column punching is also suggested in consideration of the stress diffusion.

关 键 词：预应力筏板基础 边柱 应力扩散 抗冲切承载力 

分 类 号：TU471.15[建筑科学—结构工程] TU470.3[建筑科学—土工工程]