强冲击载荷作用下钢筋混凝土本构关系的研究

THE CONSTITUTIVE RELATIONSHIP OF REINFORCED CONCRETE SUBJECTED TO SHOCK LOADING

基于复合材料细观思想,通过研究钢筋混凝土代表性体积单元,提出了理想情况下钢筋混凝土本构关系可由混凝土材料粘弹性本构关系与一个依赖于增强钢筋材料特性的常量G的乘积确定的思想;假设损伤只发生在混凝土材料内部,并给出了一般的损伤演化方程.由此得到了单向加筋、正交双向加筋和正交三向加筋混凝土的损伤型动态本构关系.数值拟合表明,理论预示曲线与试验结果曲线吻合良好.

By analyzing a RVE of reinforced concrete a constitutive relationship of reinforce concrete is proposed that is obtained by multiplying the visco-elastic constitutive relationship of concrete by a material constant G of steel reinforcing bar. Then, we derive a damage law on the assumption that damage occurs only in the concrete. By incorporating the damage law into the constifutive equation, a new constitutive relationship of reinforced concrete is obtained. Numerical compution results in two perpendicular directions based on the model are in good agreement with the experimental ones.