钢管约束型钢再生混凝土柱的抗震性能分析

Analysis of seismic behavior of recycled concrete w ith section steel filled steel tube

针对再生混凝土相对普通混凝土而言延性较差,承载力较低的特点,在进行外围钢管约束的基础上,内部增设骨架支撑形成钢管型钢再生混凝土柱。考虑构件的非线性和再生混凝土的塑性损伤本构,建立了非线性有限元模型,分别以相同含钢率下,不同截面构造为变化参数,建立了不同支撑形式的钢管约束再生混凝土柱有限元模型,通过对模型进行低周循环加载,与无骨架支撑的钢管再生混凝土柱进行对比,分析各模型试件的抗震性能。结果表明:在相同含钢率下,相较其他截面构造,钢管再生混凝土内增设工字型钢后,具有更大的初始刚度、水平极限承载力,延性和滞回耗能系数等抗震性能提升明显。在此基础上,对钢管型钢再生混凝土和的钢管再生混凝土试件进行了P-Δ影响参数对比分析。

In view of the ch-acteristics of low ductility and bearing capacity of recycled conerete.On the basis of the external constraints, the internal support is added to form a steel tube confined steel recycled concrete.The nonlinear finite element model is established by considering the initial geometric nonlinearity of the component and the plastic damage of recycled conerete.Under the condition of the same steel ratio, the finite element model of steel tube confmed recycled concrete columns is established with different support forms.By means of the model with loading low cycle load, the seismic behavior of each mode/ is analyzed with compared recycled concrete filled steel tube.The results show that under the same steel ratio,compared with other cross section structure,steel tube concrete adding H-section steel,has more greater initial stiffness,the seismic performance is improved significantly.On the basis of these,the parameters of p-A influence on recycled concrete filled steel tube and section steel recycled concrete of steel tube are analyzed.