框架-剪力墙结构弹塑性地震剪力分配分析

Analysis on seismic shear distribution of frame-shear wall structures under elasto-plastic condition

基于背景工程,构建考虑协同工作机制的平面分析结构模型,分别对3组不同刚度特征值的框架-剪力墙结构展开参数分析,对框架剪力与结构基底剪力的比值进行定量分析研究,总结弹塑性状态下结构的内力分配机制.针对设计过程中是否对框架剪力进行调整,建立2类分析模型,探讨了剪力调整对结构配筋、罕遇地震下结构性能以及结构抗倒塌能力的影响.结果表明,现行规范规定的剪力调整对框架-剪力墙抗震性能的影响较小,且调整方案对强柱弱梁的设计原则存在不利影响.结构设计过程中,在保证强柱弱梁和塑性铰转动能力的前提下可不必采取剪力调整措施.

Based on background engineering,a planar analytical structural model considering collaborative work mechanism was constructed.Parametric analysis was performed on the frame-shear wall structures considering three different stiffness eigenvalues.The ratios of the frame shear to the structural base shear were quantitatively analyzed.The internal force distribution mechanism of the structures under the elasto-plastic condition was summarized.Two types of analysis models were established to analyze whether the frame shear force was adjusted during the design process.The effects of the shear force adjustment on the structural reinforcement,the performance against rare earthquakes,and the ability to resist collapse were investigated.The results show that the shear adjustment specified in the current code has little effect on the seismic performance of frame shear walls,and the adjustment plan has adverse effects on the design principles of strong columns and weak beams.It is not necessary to take shear adjustment measures in the structural design process on the premise of ensuring the rotational capacity of strong columns,weak beams,and plastic hinges.