基于微平面模型的切口重力坝试验数值模拟

Numerical simulation of prenotched gravity dam models based on microplane model

微平面模型是近年新提出来的一种材料本构模型,可以较好地描述混凝土发生开裂以后的应变软化行为。本文为了探讨微平面模型在大型水工结构分析方面应用的可能性,尝试性地采用M3版微平面模型,对常规自重应力场作用下的切口重力坝和人工静荷载作用下的切口重力坝试验进行了数值模拟。计算结果表明,微平面模型对于切口重力坝和人工静荷载作用下的切口重力坝试验的P_d曲线模拟较好,同时对混凝土开裂方向的模拟和试验结果也比较一致,在大型水工结构数值分析方面,微平面模型具有一定的实用性。

As a new constitutive model of materials, microplane model can be used to simulate the strain softening behavior of concrete after fracture. In order to demonstrate the application of the constitutive model, the prenotched gravity dams and prenothced dam model with artificially increased dead weight are studied based on the microplane model M3. The numerical results show that the microplane modei can simulate well the prenotched gravity dams and dam model with artificially increased dead weight, and can predict well the crack trajectories of the prenotched gravity dams.