宽连梁剪力墙及其抗震性能研究

提出一种通过加大连梁两侧或单侧宽度的方式，用以解决连梁受剪承载力不足的问题。基于连梁抗弯刚度等效的原则，可以有效避免连梁刚度增大，地震作用随之增大的现象。对宽连梁剪力墙结构在多遇地震作用下的层间位移角、动力特性、侧向刚度、连梁内力等进行分析，验证了宽连梁对改善连梁剪压比的作用。对普通连梁与宽连梁构件进行了弹塑性有限元分析，将其滞回性能、骨架曲线等进行比较，证明了宽连梁的变形能力和延性明显优于普通连梁。最后，通过对剪力墙结构的弹塑性时程分析，对宽连梁在高层结构中的抗震性能进行研究。分析结果表明：通过增加连梁宽度的方式能够有效提高连梁的受剪承载能力；与相同抗弯刚度的普通连梁相比，宽连梁的跨高比增大，其转动能力、延性与耗能能力明显增强；罕遇地震作用下宽连梁剪力墙结构在最大层间位移角、塑性铰分布、连梁剪力、受剪承载力等方面均显著优于普通连梁剪力墙结构。

Research on seismic behavior of wide coupling beams in shear wall structure

By increasing the width of coupling beams on one side or both sides has been proposed to mitigate the insufficient shear capacity. The equivalent flexural rigidity of coupling beams proposed in the paper would prevent the seismic action from increasing with the growing coupling beam stiffness. The inter-story drift ratio, dynamic characteristics, lateral stiffness and internal forces of coupling beams under frequent seismic action were analyzed to validate whether wide coupling beams would improve the shear-to-compression ratio. Besides, elasto-plastic finite element analysis of both ordinary beams and wide beams were conducted to compare their hysteretic behavior and skeleton curves, proving that the deformation capacity and ductility of wide coupling beams preceded those of ordinary coupling beams. Moreover, the elasto-plastic analysis of shear wall structure further reveals the seismic behavior of wide beams in the high-rise buildings. The analysis results demonstrate that the shear capacity could be effectively enhanced by widening the coupling beam. Compared the wide beam with the ordinary coupling beam with the same flexural stiffness, the increase of span-to-depth ratio of wide coupling beam would lead to remarkable rotation capacity, ductility and dissipation capacity. Under the rare seismic effect, wide coupling beam would perform well in decreasing inter-story drift, plastic hinge distribution, shear force and shear bearing capacity.