钢筋混凝土剪力墙应变率效应试验与基于动力塑性损伤模型的模拟

应变率对混凝土材料的力学性能有着重要影响。该文在对2片剪力墙构件进行快速加载试验的基础上,在混凝土塑性损伤模型中引入应变率效应,建立了考虑应变率效应的塑性损伤模型。应用该模型对该文所描述的快速加载下的剪力墙构件以及在拟静力作用下的另外3个构件进行了有限元模拟,结果表明考虑应变率效应的混凝土塑性损伤模型较好地描述了钢筋混凝土剪力墙在快速加载下的非线性行为。最后,运用所建立的考虑应变率效应的混凝土塑性损伤模型对不同轴压比和加载速率下剪力墙构件的非线性性能进行了模拟与分析。

TEST ON STRAIN RATE EFFECTS AND ITS SIMULATION WITH DYNAMIC DAMADED PLASTICITY MODEL FOR RC SHEAR WALLS

It has been widely recognized that strain rate has effects on the performance of concrete materials and reinforced concrete(RC) structures.In this study,experimental study on two RC shear walls under different rate loads are carried out.The damage plastic model with the consideration of the strain rate effects is employed to simulate the behavior of the two specimens tested in this study and additional three other specimens under pseudo-static loads.Simulation results show that the developed dynamic damage plastic model can simulate the nonlinear behavior of RC walls under both pseudo-static and high rate loads with acceptable accuracy.Moreover,the developed damage plastic model is also used to study the effects of axial load ratios on the nonlinear behavior of RC wall specimens under different load rates.