一个新的钢筋混凝土损伤塑性模型

为了准确、高效地对拆除爆破工程进行数值模拟，考虑钢筋混凝土受拉刚化效应以及配筋率对受拉刚化效应的影响和受压箍筋约束效应，采用组合模量的方法给出了一个简化的钢筋混凝土本构关系，在LS-DYNA有限元软件中的混凝土损伤塑性模型的基础上，通过参数修改建立新的钢筋混凝土损伤塑性模型模拟来钢筋混凝土。在实验验证的基础上，采用钢筋混凝土损伤塑性等效模型对一双切口钢筋混凝土烟囱延时爆破拆除效果进行数值模拟，数值模拟结果表明该模型可以准确反映烟囱倒塌破坏及运动过程。

A new reinforced concrete damage plasticity model

In order to accurately and efficiently simulate the blasting demolition project, a simplified constitutive model of reinforced concrete has been proposed by using the method of combination modulus, based on the concrete damage plasticity model in LS-DYNA. In the model, we have taken the tension stiffening effect, the ratio of reinforcement effect on tension stiffening, and the confinement effect of stirrups of reinforced concrete into account. On the basis of experimental verification, the numerical calculation has been performed to simulate the delay blasting demolition of a double incision reinforced concrete chimney. The simulated results show that the proposed model can qualitatively reproduce the collapse and movement processes of chimney.