梁轴向刚度对框架-剪力墙结构动力弹塑性性能的影响

为了研究梁轴向刚度对结构动力弹塑性性能的影响,利用Perform-3D中的纤维单元,分别考虑梁轴向刚度的释放与不释放,详细对比了三个框架-剪力墙结构的楼层剪力、层间位移角以及主要构件的性能化复核结果。结果表明不释放梁的轴向刚度,会造成框架梁刚度过大,吸收地震作用较多,楼层剪力尤其是基底剪力偏大,结构的塑性耗能过大,剪力墙的损伤较严重,且层数越多,该种影响越严重。因此,在进行结构动力弹塑性分析时,需考虑将梁的轴向刚度进行释放。

THE INFLUENCE OF THE AXIAL STIFFNESS OF THE FRAME BEAM ON THE DYNAMIC ELASTOPLASTIC OF THE FRAME-SHEAR WALL STRUCTURE

Considering the release and non-release of the axial stiffness of the beam,the fiber element in PERFORM-3D was used to study the influence of beam axial stiffness on the dynamic elasto-plastic performance of the structure.Moreover,the results of floor shear,story drift angle and performance-based review of main members of three frame-shear wall structures were compared in detail.The results show that,if the axial stiffness of the beam is not released,the rigidity of the frame beam will be larger,and the seismic absorption will be more,moreover,the floor shear,especially the base shear,will be larger with the larger plastic energy consumption of the structure,in which the damage of the shear wall will be more serious with the number of stories.Therefore,it is necessary to release the axial stiffness of the beam in the dynamic elastic-plastic analysis of the structure.