双角钢-抗剪腹板节点钢框架低周往复加载下的试验研究

Research on Seismic Performance of Steel Frame with Double Angle Steel and Shear Web Joints Under Quasi-Static Loading

提出了适用于高烈度区的双角钢-抗剪腹板节点框架,选定某多层装配式钢结构住宅作为设计及试验原型,在低周往复加载作用下对双角钢-抗剪腹板节点框架和原型节点框架模型进行抗震性能的研究。两榀框架试件的破坏首先出现在外挂墙板,随后梁柱节点处角钢加劲肋及柱根部位置出现破坏。试验结果表明:双角钢-抗剪腹板节点框架相对于原型节点框架承载能力略低,但其屈服位移更大,前期的滞回环稍显单薄,加载后期由于抗剪腹板与顶底角钢形成了梁端三向约束,滞回环更加饱满,两榀框架试件的延性都满足设计要求;双角钢-抗剪腹板节点框架耗能能力略低于原节点框架,但在后期破坏过程中的耗能能力有着较大的上升空间,可以满足抗震区对于结构设计的要求。

A double angle steel-shear web joint frame suitable for high intensity area was proposed.A multi-story prefabricated steel structure housing in Xuzhou was selected as the design and test prototype.The seismic performance of the double angle-steel shear webs joint frame and the original joint frame model were studied under quasi-static.The damage of the two frame specimens first appeared on the external wall panels,and then on the angle steel stiffeners at the beam-column joints and the column roots.The results showed that the bearing capacity of the double angle-steel shear web joint frame was slightly lower than that of the original joint frame,but the yield displacement of the double angle-steel shear web joint frame was larger.The hysteresis loop at the early stage was slightly thinner.In the later stage of loading,due to the shear web and avoidances angle formed three supporting points toward constraint hysteresis loop more full.The ductility of the two frames could meet the design requirements.The energy dissipation capacity of the double-angle steel-shear web joint frame was slightly lower than that of the original joint frame but had a large space to rise in the process of late failure,which could meet the requirements of seismic area for structural design.