基于OpenSees的钢筋混凝土剪力墙数值分析

Numerical analysis of reinforced concrete shear wall based on OpenSees

有限元数值模拟是研究钢筋混凝土剪力墙抗震性能的一种有效手段,不同数值分析模型的选取对钢筋混凝土剪力墙抗震性能的研究有较大的影响。文章通过OpenSees软件分别采用基于塑性铰单元的纤维模型和基于位移的纤维单元对不同轴压比下钢筋混凝土剪力墙建立了数值分析模型,分析材料的本构模型,阐述不同轴压比的钢筋混凝土剪力墙低周反复荷载试验,并将数值模拟结果与试验结果进行对比分析。结果表明:钢筋混凝土剪力墙由弯曲变形控制、滞回环比较饱满、耗能情况比较好、具有较好的抗震性能,同时随着轴压比的增大,试件的屈服荷载和极限荷载都有显著增加,延性系数有所降低;采用基于塑性铰单元的纤维模型在合理确定塑性区段范围的基础上能够更好的模拟以受弯为主的钢筋混凝土剪力墙的抗震性能;基于塑性铰单元模拟得到的屈服荷载值、极限荷载值以及延性系数与试验结果的误差都控制在10%之内,而基于位移的纤维单元模拟得到的屈服荷载值误差都超过20%、极限荷载值误差在10%之内。

The finite element numerical simulation is an effective method to study the seismic performance of reinforced concrete shear wall,and the selection of different numerical analysis model has a great influence on the seismic performance of reinforced concrete shear wall.The finite element software OpenSees is used to establish the numerical analysis model of reinforced concrete shear wall under different axial compression ratios,the fiber models based on the beam with hinges element and the displacement based on beam column element are simulated respectively. Meanwhile, the constitutive model of material is analyzed,the low cyclic loading test of reinforced concrete shear wall is presented,and the simulation results are compared with the test results.The results indicate that the reinforced concrete shear wall is controlled by flexural deformation,the hysteresis loop is full,the energy consumption is better and has better seismic performance. With the increase of axial compression ratio,the yield load and ultimate load of the specimens increase significantly,and the ductility coefficient decreases a little.The fiber model based on the beam with hinges element can better simulate the seismic performance of the reinforced concrete shear wall when the plastic section is determined reasonably.The error of the yield load,ultimate load and the ductility coefficient based on the beam with hinges element is controlled within 10%.The error of the yield load is over 20%and the error of the ultimate load is controlled within 10%,which are based on the Displacement-Based Beam-Column Element.