钢管混凝土框架-RC剪力墙混合结构滞回性能分析

Hysteresis behavior analysis of mixed structures with concrete-filled steel tubular frame and RC shear wall

为了研究带钢管混凝土边柱钢筋混凝土(RC)剪力墙的抗震性能,在其他研究者完成的带钢管混凝土边柱RC剪力墙和普通钢筋混凝土剪力墙滞回性能试验结果的基础上,采用开源非线性分析程序OpenSees平台中的非线性纤维模型对其进行了低周往复试验的数值模拟,通过直接在截面层次定义非线性剪切恢复力的方法来模拟纤维截面的抗剪。计算结果与实测结果总体吻合较好,研究表明:这种考虑剪切效应的纤维模型法能够较好地模拟该类组合剪力墙的抗剪承载力、捏缩效应以及刚度退化,而且运算效率较高。

In order to study the seismic performance of the reinforced concrete (RC) shear walls framed with concrete-filled steel tubular (CFST) columns, the Open System for Earthquake Engineering Simulation (OpenSees), an open-source nonlinear analysis platform, was used to simulate the performance of this type of composite shear walls under low cyclic loading with the nonlinear beam-column-fiber model. The simulation was based on the other researchers' hysteresis experiments results as regards both the common RC shear walls and the RC shear walls framed with CFST columns. The shear force of fiber sections was simulated as a sectional nonlinear shear restoring force. The calculation results are in good agreement with those from the experiments. The results show that the fiber modeling method, considering the shear effect, can predict effectively the maximum shear force, pinch effect and stiffness degradation of composite shear walls. It can also save a lot of time consuming in computation because of its high arithmetic efficiency.