考虑弯剪耦合作用的剪力墙宏观单元非线性有限元分析

Nonlinear Finite Element Analysis of Shear Wall under Shear-Flexural Interaction

SFI-MVLEM单元和分层壳单元为两种典型的考虑弯剪耦合作用的剪力墙宏观单元。通过剪力墙构件及联肢剪力墙结构两个层次,探究SFI-MVLEM和分层壳单元的数值模拟效果,并通过敏感性分析,探究骨料剪切互锁系数、纵筋销栓作用系数及剪力传递系数对单元力学性能的影响。分析结果表明:对于剪力墙构件,SFI-MVLEM与分层壳均具有较好的模拟效果,其中分层壳单元一定程度低估了构件的耗能能力;对于联肢剪力墙结构,分层壳可较好预测结构的承载力,SFI-MVLEM则明显低估了承载力;SFI-MVLEM单元的承载力随着骨料剪切互锁系数及纵筋销栓作用系数的增大而增大,单元剪切变形量及捏缩效应均随着骨料剪切互锁系数及纵筋销栓作用系数的增大而减小;分层壳单元的承载力随着剪力传递系数的增大而增大。

SFI-MVLEM and multi-layer shell are two typical shear wall elements under shear-flexural interaction. The simulation effect of SFI-MVLEM and multi-layer shell is explored though the numerical analysis of wall components and coupled shear walls. Besides,the influences of shear friction coefficient,dowel stiffness parameter as well as shear retention factor on the mechanical properties of element are investigated by sensitivity analysis. The analysis results show that both SFI-MVLEM and multi-layer shell have good simulation results for shear wall components,although the multi-layer shell element underestimates the energy dissipation capacity slightly. For coupled shear wall,multi-layer shell can predict the bearing capacity better than SFI-MVELM. In addition,the bearing capacity of SFI-MVLEM increases with the growth of the shear friction coefficient and dowel stiffness parameter,while the shear deformation and pinch effect have the opposite changing trend. The bearing capacity of the multi-layer shell increases with the rise of shear retention coefficient.