循环荷载下单面外包混凝土剪力墙栓钉剪力需求

Shear force demand of headed stud for composite plate shear walls-concrete encased under cyclic loading

钢板外包混凝土组合剪力墙(C-PSW/CE)由钢板和外包在钢板两侧或一侧的混凝土板组成,两者通过栓钉形成整体,栓钉可协调两者在平面内外的变形,针对C-PSW/CE栓钉剪力需求的研究较少。利用有限元模拟结果,分析了2%层间侧移内强度劣化低于15%的钢板单面外包混凝土C-PSW/CE各组件在循环荷载下的响应。分析了钢板厚度、混凝土板厚度、栓钉间距、栓钉直径及墙板高宽比对栓钉剪力的影响。在钢板弹性阶段,单个栓钉的最大剪力受栓钉间距、混凝土板厚的影响较小;当栓钉间距不变时,随着栓钉直径或钢板厚度的增大,栓钉最大剪力增大;单个栓钉最大剪力与墙板高宽比关联较大。根据36个算例的有限元模拟结果,提出了强震下钢板单面外包混凝土C-PSW/CE栓钉剪力需求预估公式。

composite plate shear walls-concrete encased(C-PSW/CE)consists of the steel plate and concrete encasements on one or both sides of the steel plate.Headed studs are used to anchor concrete encasements on the steel plate,which can coordinate the deformation of the steel plate and concrete encasements.Previous researches pay little attention to the shear force demand of headed stud.In this paper,a finite element model of C-PSW/CE is established using ABAQUS.Under cyclic loading,the responses of the components in C-PSW/CE with concrete encased on one side,in which the shearing strength deterioration is no more than 15%at the drift ratio 2%,are investigated.The effects of the steel plate thickness,concrete panel thickness,spacing of headed studs,headed stud diameter and the height-width ratio of the shear wall on the maximum shear force of headed stud are analyzed.In the elastic stage of the steel plate,the maximum shear force of headed stud is less affected by the spacing of headed studs and concrete plate thickness.When the spacing of headed studs is constant,the maximum shear force of headed stud increases with the increase of headed stud diameter or steel plate thickness.The maximum shear force of headed stud is correlated with the height-width ratio of the shear wall.Based on the numerical results of 36 finite element specimens,an available formula is proposed for the shear force demand of the headed stud in seismic design of C-PSW/CE.