两层带水平缝钢管混凝土剪力墙抗震性能试验研究

Experimental study on seismic behavior of two-story shear wall with concrete filled steel tube columns and horizontal joints

设计3个两层单跨缩尺比为1∶3的带水平缝钢管混凝土剪力墙,对其进行拟静力试验,其中2个组合剪力墙按"强剪弱弯"设计,1个按"强弯弱剪"设计,剪跨比均为1.55,分析结构的承载力、破坏机理、滞回性能、刚度退化、延性及耗能能力等。试验结果表明:钢管混凝土暗柱和剪力墙竖向接合面连接可靠,底层钢管出现局部屈曲;组合剪力墙正截面承载力中绝大部分由钢管混凝土暗柱承担,约占底部弯矩75%;组合剪力墙的极限位移角大于1/100,带水平缝组合剪力墙滞回曲线饱满,无明显"捏拢"现象。给出了无轴压力作用下钢管混凝土剪力墙正截面承载力计算方法,其计算值与试验值吻合较好。

Quasi-static tests of three 1：3 scaled one bay and two story shear wall specimens with concrete filled steel tube columns （CFSTC） and horizontal joints with shear-span ratio of 1.55 were conducted. Two specimens were made strong in shear and weak in flexure while one specimen was made strong in flexure and weak in shear. The beating capacity, failure mechanism, hysteretic behavior, stiffness degradation, ductility and energy dissipation of the composite structure were analyzed. The test results indicate that the vertical joints are connected reliably. The local buckling appears at the CFSTC bottom. About 75% of normal section bearing capacity at bottom section is provided by CFSTC, which satisfies the existing specification. The ultimate drift ratios of all specimens are larger than 1/100. No obvious pinching appears in the plump hysteretic curves. A formulation was proposed to predict the normal section beating results. capacity of the composite structure without axial pressure, and the calculation results agree well with the tests