地震作用下大体积混凝土结构损伤发展估计

Prediction of damage evolution of massive concrete structure subjected to earthquake excitation

建议了一种地震荷载作用下混凝土结构损伤发展估计的思路和方法,通过混凝土结构在循环荷载作用下损伤演化特点的分析,推导出一种考虑组合效应的损伤演化方程.该方程反映了混凝土材料在复杂荷载作用下的多轴效应,形式简单便于数值实现.对实际工程动力损伤分析的结果表明,损伤理论更适用于混凝土结构的力学性能分析.

A damage mechanics approach to predict the damage evolution of concrete structure subjected to earthquake load is proposed. In the approach, damage evolution equation in which the effect of combination of tension and compression is taken into consideration is obtained according to the analysis of feature of damage evolution for concrete structures under cyclic loads. In this equation, the multiaxial effect of concrete material is reflected under complicated load condition. Simple form is easy to numerical implementation. The dynamic damage analysis results of actual project indicate that damage theory is appropriate to analyze the concrete structure mechanics properties.