新型钢-砼-钢组合剪力墙抗震性能试验研究

Experimental Study of the Seismic Behavior of Novel Steel-Concrete-Steel Composite Shear Wall

本文提出一种采用加强槽钢剪力连接件的新型钢-砼-钢组合剪力墙.通过对4个试件进行推出试验研究该新型剪力连接件的受剪性能,分析其破坏模式、荷载-滑移曲线、极限抗剪承载力以及极限滑移量等.为研究采用该新型加强槽钢连接件的钢-砼-钢组合剪力墙试件的抗震性能,完成了3个剪跨比为2.0的组合剪力墙试件的拟静力试验,研究了该新型组合剪力墙在低周往复作用下的破坏形态、滞回性能、承载能力、变形能力以及耗能能力,分析钢板厚度和是否设置边柱对其抗震性能的影响.试验结果表明:推出试验试件的荷载-滑移曲线可划分为5个阶段,其破坏模式是试件的破坏模式为两侧螺栓和槽钢连接件腹板的剪切破坏,与普通槽钢连接件相比具有更好的受剪性能并且其极限滑移量满足规范要求.采用加强槽钢连接件的钢-砼-钢组合剪力墙试件的破坏形态为墙体底部钢板屈曲、底部焊缝开裂以及内部混凝土压溃.试件平均破坏位移角可达1/63 rad,具有良好的变形能力.试件耗能随着变形的增大而迅速增大,抗震性能良好.钢板厚度的增加对试件承载能力有着显著提升,对变形能力的影响较小;边柱的设置能显著提升此新型剪力墙试件的承载与变形能力.增加钢板厚度以及边柱的设置可显著改善该组合剪力墙的抗震性能.

This study proposes a novel steel-concrete-steel composite shear wall with enhanced C-channel connectors.Through four push-out tests,the shear behavior of the novel shear connector was investigated.The failure mode,load-slip curve,ultimate shear capacity,and ultimate slip of the connector were analyzed.To investigate the seismic behavior of novel composite walls,three quasi-static tests of specimens with shear-span ratio of 2.0 were completed,and the failure mode,hysteretic behavior,bearing capacity,deformation capacity,and energy dissipation capacity of composite walls under low cycle reciprocating motion were investigated.The effects of steel plate thickness and setting boundary column on seismic behavior were reported.The test results show that the load-slip curve of push-out test specimens can be divided into five stages.The failure mode of specimens includes shearing of the bolts on both sides and shearing of the web of the channel connector.Compared with ordinary channel connectors,novel channel connectors exhibit better shear behavior,and its ultimate slip meets the requirements of the code.The failure modes of novel composite walls are steel plate buckling and weld cracking at the bottom of the wall and concrete crushing.The average failure displacement angle of the specimen can reach 1/63 rad,which indicates good deformation capability.The energy consumption of the specimens rapidly increases with the increase in deformation,and the seismic behavior is good.The thickness of the steel plate has a significant effect on the bearing capacity but has only a slight effect on the deformation capacity.The boundary column can significantly improve the bearing and deformation capacities of the specimens.The seismic behavior of novel composite walls can be significantly improved by increasing the thickness of the steel plate and setting boundary columns.