施工期混凝土时间效应增量型数值分析

研究了长期加载后的混凝土梁柱加载至破坏的非线性数值模拟计算技术.基于混凝土徐变的应力-应变-时间耦合本构关系应用梯形积分公式建立了混凝土时效性能的增量型数值迭代模型及其算法;基于有限元法建立了非线性增量型数值迭代模型及其算法.采用该方法对偏心柱和简支粱进行数值计算,计算结果与试验值吻合较好,表明该算法可以满足混凝土构件收缩徐变的分析要求.

An Increment Numerical Method of Concrete Time-dependent Behaviors during Construction

A nonlinear analysis method considered of concrete's time-dependent nonlinearity is dealt with. The increment numerical computational formulas about concrete's time-dependent stress-strain coupled mechanism were deduced, in which the creep deformation of concrete was described in accordance with a trapezoid integral algorithm based on the expansion of a degenerated kernel of the compliance function. In addition, the finite element method submitted to the increment algorithm was ejected to analyze the non-mechanical deformations induced by the time-dependent deformations of concrete. They were illustrated with a reinforced concrete beam and a column, which of time-dependent behaviors by being loaded in early period had been tested. The results are in agreement with experimental data.