装配式钢套管混凝土组合剪力墙竖向受拉-水平滞回荷载试验研究

Tests for vertical tension and horizontal hysteretic load of assembled steeltube reinforced concrete composite shear wall

进行6个剪跨比为1.62的装配式钢套管混凝土(CFST)组合剪力墙试件的拟静力试验,研究钢管混凝土芯柱含量比、平面外偏心距、初始轴拉力对装配组合剪力墙抗震性能的影响,分析试件的破坏特征、滞回性能、变形和延性、承载力以及刚度退化和耗能。结果表明:装配组合试件的破坏形态整体为弯剪复合破坏,在竖向受拉-水平弯剪滞回复合作用下仍具有较高的承载力,滞回曲线饱满,变形和耗能较好,破坏时残余刚度大;剪切变形分量与总变形呈线性关系,约占总位移的21%;试件平均极限位移角1/42,平均延性系数5.0,表明组合剪力墙装配整体性较好。截面承载力参数分析表明抗剪承载力随钢管混凝土含量比增大而增大,而变形曲率随之减小;抗剪承载力随初始轴拉力和平面外偏心距增大而减小,适当的轴拉力能增大截面变形能力,但平面外偏心距对变形不利。

Quasi-static tests of 6 assembled concrete-filled steel tube(CFST)composite shear wall specimens with shear span ratio of 1.62 were conducted to study effects of CFST core column content ratio,out of plane eccentricity and initial axial tension on the aseismic performance of assembled composite shear walls.Failure characteristics,hysteretic performance,deformation and ductility,load-bearing capacity,stiffness degradation and energy consumption of specimens were analyzed.The results showed that the overall failure mode of assembled composite shear wall specimens is bending-shear composite failure,they still have higher load-bearing capacity under the combined action of vertical tension and horizontal bending-shear hysteresis,the hysteretic curve is full,deformation and energy consumption are better,and their residual stiffness is large during failure;the shear deformation component is linearly related to the total deformation,it is about 21%of the total displacement;the average ultimate displacement angle of specimens is 1/42,their average ductility coefficient is 5.0,so the assembly integrity of composite shear walls is good;their shear-bearing capacity increases with increase in concrete-filled steel tube content ratio,while their deformation curvature decreases;their shear-bearing capacity decreases with increase in initial axial tension and out of plane eccentricity,the appropriate axial tension can increase the cross-section deformation capacity,but the out of plane eccentricity is unfavorable to deformation.