【摘要】 为研究一字型钢管束混凝土剪力墙的轴压力学性能,采用有限元分析软件建立了9个一字形钢管束混凝土剪力墙模型,研究了钢管束管壁厚度分别为3、6和9 mm时,C30、C40和C50混凝土对此类剪力墙轴压性能的影响,得到了剪力墙的破坏模式、荷载位移曲线及控制点的应力应变关系。结果表明:钢管约束作用下,核心混凝土处于三向受压状态,混凝土的抗压强度明显提高;混凝土强度等级相同时,增加钢管束管壁的厚度,剪力墙轴向受压承载力的提升幅度呈先增加后减小的趋势;剪力墙混凝土强度等级为C30、C40和C50时,钢管束管壁厚度从3 mm到6 mm,其轴向受压承载力增加最为明显;9个模型的核心混凝土紧箍系数均≥1,混凝土呈现出明显的塑性材料性能。更多还原

【Abstract】 In order to study the axial pressure performance of the in-line steel-tube bundle concrete shear wall,9 finite element models of the one-shaped steel tube bundle concrete shear wall were established by finite element analysis software. The effects of different strength grades of C30,C40 and C50 concrete on the axial compression performance of shear walls, steel pipes confined to thickness of 3,6 and 9 mm were studied. The failure modes,load-displacement curves of shear walls,and stress-strain relationship of the control points were obtained. The results show that with the thickness increase of the steel tube,the axial compression bearing capacity of the shear wall is improved to some extent. Under the constraint of steel tube,the core concrete is in the three-way compression state,and the compressive strength of the concrete is obviously improved. When the concrete strength grade is the same, the axial compressive bearing capacity of shear wall increases first and then decreases with the increase of the thickness of steel tube bundle.When the concrete strength grade of shear wall is C30, C40 and C50, the thickness of steel tube from 3 mm to 6 mm, the axial compressive bearing capacity of steel tube increases most obviously. Because the core concrete hoop coefficients of the nine models are greater than or equal to 1,concrete exhibits significant plastic material properties.更多还原