基于递归算法的混凝土干燥徐变数值分析

对混凝土的干燥徐变机制进行分析,认为干燥徐变主要由2个原因造成:微裂缝的闭合和应力导致的附加收缩。在毛细孔压力理论和微裂缝理论的基础上,推导了常应力状态下的干燥徐变理论模型,通过递归算法,将该理论公式与有限元计算程序相结合,推导得可计算复杂受力状态下的混凝土徐变而无需记录应力历史的有限元模型。通过与试验结果和Bazant模型的计算结果对比,该模型计算结果的准确性得到验证

Numerical Analysis for Drying Creep Behavior of Self-compacting Concrete Based Rn Recursive Calculation

Total creep of concrete was composed of basic creep and drying creep. Drying creep of concrete has two different sources of microcracking and stress-induced shrinkage. Based on the theory of pore water and microc- racking,the model for drying creep caused by constant stress was derived from rheological equations. The proposed model was coupled with FEM analysis by recursive calculation,so that the creep caused by changing load can be cal- culated without considering stress history. Verification of the model was conducted through comparison with experi- mental results and Bazant＇s empirical model. The comparing results validated the model for drying creep of concrete.