基于非局部模型的混凝土损伤的数值模拟

Numerical simulation of concrete material based on the non-local damage model

分析了局部损伤模型在进行混凝土应变软化模拟时存在的问题:网络依赖性和零能量损耗问题;在传统的非局部损伤模型中引入光滑的权函数,构造一种新的非局部损伤模型。计算表明该非局部损伤模型可较好避免有限元在应变软化模拟时的网络依赖性,预测出的荷载-位移反应与实际情况吻合较好。

The two problems associated with strain softening of concerte material,zero consumption of energy and mesh dependence, are studied. The smooth weight function is introduced to substitute for the piecewise uniform weighting which has been implicitly assumed in the classical non-local model. The results of an example indicate that the non-local model in which the B-spline weight function is introduced can overcome mesh dependence when the strain softening phenomenon of concrete material is simulated. The predicted load-displacement response agrees well with the experiment result.