型钢自密实混凝土叠合剪力墙恢复力模型

为了研究型钢自密实混凝土叠合剪力墙的抗震性能以及恢复力特性，对1个全现浇型钢普通混凝土剪力墙试件和5个型钢自密实混凝土叠合剪力墙试件进行了低周反复加载试验。通过分析试验所得的剪力墙的水平荷载-位移骨架曲线，建议将其简化为以屈服点、峰值荷载点、极限点为特征点的三折线模型，并根据试验现象以及理论分析结果给出骨架曲线中各特征点参数的计算方法。对试验所得滞回曲线进行回归分析，得到了墙体的抗侧刚度退化规律，据此得出适用于型钢自密实混凝土叠合剪力墙的恢复力模型，并用试验得到的骨架曲线与滞回曲线进行验证。结果表明，由此恢复力模型求得的计算曲线与试验曲线吻合程度较好，该模型可以较好地反映型钢自密实混凝土叠合剪力墙的恢复力特性，可用于计算地震作用下以受弯破坏为主的型钢自密实混凝土叠合剪力墙的荷载-位移滞回曲线。

Experimental study on restoring force model of self-compacting concrete composite shear walls with profile steel

In order to study the seismic behavior and restoring force characteristics of self-compacting concrete (SCC) composite shear walls with profile steel, quasi-static tests were carried out on one steel reinforced concrete shear wall and five SCC composite shear walls with profile steel. Based on the skeleton curves that were extracted from the test, it was proposed that the skeleton curve model can be simplified into a three-linear skeleton curve model which was characterized by yield point, peak load point and ultimate point. The formula to calculate parameters of top displacement, load and stiffness of yield point, peak load point and ultimate point were recommended by experimental phenomena and theoretical analysis. The rules of stiffness degradation were proposed through the regression analysis of hysteretic loops that were extracted from the test. The restoring force model that can be applied to SCC composite shear walls with profile steel was accordingly proposed based on skeleton curve model and the rules of stiffness degradation presented before. The restoring force model was validated by the comparisons with skeleton curves and hysteretic loops from the test. The results show that the calculated skeleton curve and hysteretic loops agree well with the experimental results. This model can well reflect the restoring force characteristics of SCC composite shear walls with profile steel, which can be used to calculate the load-displacement hysteretic curve of SCC composite shear walls with profile steel mainly failing in bending under earthquake action.