混凝土收缩徐变分析的虚功增量方程及应用  

THE INCREMENTAL VIRTUAL WORK EQUATION FOR CONCRETE SHRINKAGE AND CREEP ANALYSIS AND ITS APPLICATIONS

作　　者：陈常松[1] 颜东煌[1] 李学文[1] 

机构地区：[1]长沙理工大学土木与建筑学院,长沙410004

出　　处：《工程力学》2010年第10期139-144,共6页Engineering Mechanics

基　　金：国家自然科学基金项目(50608008;50878030)

摘　　要：为计算大跨柔性混凝土结构的力学响应,常需同时进行非线性与混凝土收缩徐变分析。基于非线性分析的虚功增量方程和混凝土收缩徐变的本构关系导出了用于非线性与收缩徐变耦合计算的混凝土收缩徐变分析的虚功增量方程,并将该虚功增量方程应用于杆系结构,结合拖动坐标法建立了非线性有限元格式的不平衡力的计算方法。通过算例表明,该文方法能够同时计算结构的非线性效应和收缩徐变效应,并且解的精度取与非线性的分析精度相同。To calculate the mechanical response of flexible long-span concrete structures, nonlinear analysis considering concrete shrinkage and creep are often required. Based on the incremental equation of virtual work and the constitutive relation of the concrete shrinkage and creep, an equation is derived for the nonlinear analysis coupled with shrinkage and creep of concrete, and it is further applied to a truss structure analysis. The method to calculate the unbalanced forces is established combined with the co-rotational coordinate format nonlinear finite element method. Examples show that the method can estimate the effects of shrinkage and creep without ruining the accuracy of nonlinear analysis.

关 键 词：非线性 混凝土 收缩徐变 虚功增量方程 迭代法 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] TU313[交通运输工程—道路与铁道工程]