核心剪力墙嵌固位置对掉层框剪结构抗震性能的影响

Influence of the fixed end of the core shear-wall on the seismic performance of frame-shear wall structure on the slope

对掉层框剪结构中的核心剪力墙采取2种不同的嵌固位置,设计不同掉层层数的算例模型,进行多遇地震和罕遇地震作用下掉层框剪结构的抗震性能分析,考察核心剪力墙不同嵌固位置对掉层框剪结构上、下接地部位剪力分配和抗震性能的影响规律。结果表明:掉层结构上、下接地部位剪力分配极不均匀,各接地部位传递的剪力占比受掉层层数和核心剪力墙嵌固位置影响;通过选择核心剪力墙的嵌固位置,可在一定程度上协调剪力传递的不均匀性,当掉层层数较多时,将核心剪力墙嵌固在上接地端更合理;当上接地部位仅有少量剪力墙时,易形成塑性变形集中,设计中应重点关注此类构件的延性。

The seismic performance of frame-shear wall structure on the slope under frequent and rare earthquake was analyzed through a number of calculating examples with different floors and two fixed ends of the core shear walls.The effect laws of different fixed ends of the core shear walls for the shear distribution and seismic performance of the upper and lower grounding parts of the structures were discussed.It is found that the shear distribution of the upper and lower grounding parts of the structure is extremely uneven.The shear force ratio transmitted by each grounding part is affected by number of layers and the fixed end of the core shear wall.Selecting the fixed end of the core shear wall can coordinate the unevenness of shear transmission to some extent,and when there are a number of layers,it is more reasonable to embed the core shear wall on the upper ground,while when there is only a small amount of shear wall at the upper ground,plastic deformation is liable to be concentrated,and the design should focus on the ductility of such components.