钢管束组合剪力墙恢复力模型研究

Research on resilience model of steel tube bundle composite shear wall

钢管束组合剪力墙是一种新型的钢与混凝土组合剪力墙,具有施工方便、承载力高等一系列优点。对7组一字型和5组T字型的足尺钢管束组合剪力墙在往复荷载作用下的滞回性能进行了试验研究,得到其骨架曲线。采用三折线模型对其骨架曲线进行模拟,并给出关键点的计算公式,得到钢管束组合剪力墙的恢复力模型。经验证,该恢复力模型模拟效果良好,可以较好地反映构件的抗震性能,为钢管束组合剪力墙结构进行弹塑性地震分析奠定了理论基础。同时进行了基于刚度退化数据的回归分析,得到了刚度退化计算公式,结果表明,骨架曲线下降段的刚度主要与钢管束组合剪力墙的剪跨比、轴压比等因素有关,而钢管束组合剪力墙的强度退化不明显。

Steel tube bundle composite shear wall is a new kind of composite shear wall with steel and concrete, and it has a series of advantages such as convenient construction and high bearing capacity. Experiments were car- ried out on seven one-font and five T-shaped full-scale steel tube bundle composite shear walls under cycle load to analyze its hysteretic performanceand get their skeleton curves. Use trilinear model to simulate their skeleton curves and give the formula of key points to get the resilience model of steel tube bundle composite shear wall. The resili- ence model has good simulation result, and it can show the seismic performance of component pretty well, which lay a theoretical foundation for the elastoplastic seismic analysis of the steel tube bundle composite shear wall. Based on the stiffness degradation data, regression analysis has been conducted to get the formula of stiffness degra- dation. It shows that the stiffness of descent stage of skeleton curves have relation to some factors such as shear span ratio and axial compression ratio, and the strength degradation of the steel tube bundle composite shear wall is not obvious.