底层加强剪力墙的抗震性能

Seismic Behavior of Shear Walls Strengthened in First Story

在底层大空间剪力墙结构中,落地剪力墙应在底层加强。为了研究这种墙的性能及合理设计方法,试验了八片钢筋砼底层加强的单片剪力墙模型,试验结果表明:将塑性铰部位控制在二层墙肢对底层大空间剪力墙结构是十分有利的。通过截面强度设计,可以控制受弯破坏剪力墙的塑性铰出现部位。剪跨比对试件破坏形态有很大影响,应当使剪力墙的抗剪强度大于抗弯强度,防止出现剪切强度破坏,同时也应采取措施防止弯曲屈服后过早出现剪切变形破坏。应当注意并校核落地剪力墙底层墙的剪跨比,当剪跨比小于1.5时,应当采取适当措施。

Those shear walls of a shear wall structure with large space in the first story which go down to the foundation should be strengthened in the first story. In order to investigate their seismic behavior, eight isolated specimens of such shear walls strengthened in the first story were designed and tested. Experimental investigations show that in order to control the pjastic hinges which will be made to occur above the first floor by design is feasible and has advantages.If shear-to-span ratio at bottom of shear wall is smaller than 1.5, shear failure may occur after fiexural yeilding. Therefore attention must be paid and special measures have to be taken to avoid the development of premature shear failure in shear walls in the first story of such a structure.