基于退化梁单元的混凝土结构徐变分析

应用退化梁单元分析了混凝土结构的徐变问题。在实际混凝土结构中,混凝土结构的徐变与混凝土开裂等非线性行为存在相互耦合作用。退化梁单元采用了三维结构的几何和物理方程,结合分块积分技术,可以方便地模拟钢筋混凝土结构的各种非线性行为。应用Trost-Bazant方法,建立了退化梁单元混凝土结构徐变分析计算方法。算例分析表明了计算结果的正确及在实际混凝土结构徐变分析中计入非线性行为的必要性。

CREEP ANALYSIS OF CONCRETE STRUCTURE BY DEGENERATED BEAM ELEMENT

The creep of concrete structures is studied using degenerated beam element. In the practical concrete structures, the creep effect will interact with such nonlinear behavior as the crack of concrete and so on. By utilizing the strain-displacement relationships, the constitutive equations of 3D structures, and the piecewise integrating technology, the degenerated beam element can simulate the nonlinear behaviors of concrete structures conveniently. Based on the Trost-Bazant method, the creep analysis procedure of concrete structures by the degenerated beam element is presented. The example analysis demonstrate the accuracy of the numerical results presented in this paper and the necessity of considering the concrete nonlinear effects in practical engineering creep analysis.