半通缝连梁剪力墙结构抗震性能分析

Analysis of seismic behavior of shear wall structures with semi seam coupling beams

连梁是剪力墙结构中重要的耗能构件,小跨高比连梁通常具有延性差,耗能能力薄弱等缺陷,不能起到保护墙肢的作用。半通缝连梁可有效改善小跨高比连梁的延性[1]。为进一步探究带有半通缝连梁的剪力墙结构的抗震性能,包括:延性系数、耗能能力等抗震性能参数,以及验证半通缝连梁剪力墙结构的破坏机理。基于有限元软件ABAQUS建立3种不同连梁形式的单片双肢剪力墙结构数值模型,对结构的低周反复试验进行仿真,以分析3种截面形式连梁的单片双肢剪力墙结构在低周往复荷载作用下的承载能力、耗能能力和延性。研究表明:半通缝连梁剪力墙结构可以兼顾双连梁剪力墙结构的延性和深连梁剪力墙结构的开裂前刚度,耗能性能与双连梁剪力墙结构相近,承载力较双连梁剪力墙结构高,抗震性能良好。

Coupling beam is an essential energy-dissipation component in shear-wall structure. In general, coupling beam with a small span-height ratio has a low ductility, the weak energy dissipation and can not protect shear walls during earthquakes. Semi-seam coupling beam has been proved to have the capacity to improve the seismic-resist- ance performance on component scale. For further investigating the seismic-resistance performance of shear-wall structure with semiseam coupling beam, including the ductility, energy dissipation etc, a numerical model of a single span coupling shear wall with semi seam coupling beam is established based on ABAQUS. In order to validate the effect of this type of new coupling beam, the models of similar structures with dual coupling beam and deep cou- pling beam are established. Low cyclic experiments are simulated by these numerical models to compare the seis- mic-resistance performance of these three types of structures, such as ductility, energy dissipation and peak load. And the failure patterns of structures are analyzed. It is found that the shear wall with semi seam coupling beam can assure the ductility and stiffness before cracking, and has a better seismic-resistance performance than the structure with dual coupling beam and deep coupling beam.