基于生死单元的榫卯连接装配整体式剪力墙的有限元模拟

Finite element simulation of mortise-tenon joint assembled integral shear wall based on birth-death element

根据之前学者对榫卯式装配式剪力墙的试验现象及研究结果,使用有限元软件OPENSEES建立了考虑榫卯剪力墙接缝破坏的弹塑性宏单元模型。通过将试验结果与数值计算结果进行对比分析,证明了该有限元分析方法合理、可靠。并采用该模型对比了不同剪跨比下有限元模拟结果与试验结果的差异。结果表明:使用基于生死单元的宏单元模型可以较好的表达试验墙体的破坏过程,模拟结果与试验结果符合程度较高。在低剪跨下该模型对试验结果的模拟效果最好,生死单元能够体现接缝破坏的过程,模拟滞回曲线与试验结果相似度最高。相比于一般实体单元的有限元模拟,该宏单元模型相较实体模型计算速度快,可以快速得到剪力墙的滞回曲线,能够适用于实际地震下的抗震分析。

Based on previous scholars’experimental phenomena and research results of tenon-mortise prefabricated shear walls,the finite element software OPENSEES is used to establish an elastic-plastic macroelement model considering joint failure of tenon-mortise shear walls.By comparing the experimental results with the numerical calculation results,it is proved that the finite element analysis method is reasonable and reliable.The model was used to compare the difference between the finite element simulation results and the experimental results under different shear-span ratios.The results show that the failure process of the test wall can be better expressed by using the macro-unit model based on the life-death unit,and the simulation results are in good agreement with the test results.Under the low shear span,the model has the best simulation effect on the test results,the life and death elements can reflect the joint failure process,and the simulated hysteresis curve has the highest similarity with the test results.Compared with the finite element simulation of general solid elements,the macro element model has a faster calculation speed than the solid model,and can quickly obtain the hysteresis curve of the shear wall,which can be suitable for seismic analysis under actual earthquakes.