本文提出了计算钢管混凝土轴压构件材料阻尼的新方法，根据Lazan材料阻尼与应力关系的理论研究，计算弹性阶段钢管混凝土构件在轴向重复荷载下的滞回曲线包围面积，得到钢管混凝土材料单位体积损耗能量。结果表明，单位体积损耗能量随最大应力幅值的提高而增大，且随混凝土强度和截面含钢率增大而减小。通过SPSS统计分析软件回归建立了钢管混凝土构件在轴向重复荷载下材料单位体积耗能与最大应力幅值、混凝土强度和截面含钢率的关系式。为进一步准确分析钢管混凝土结构动力性能及进行钢管混凝土结构的抗震分析打下了基础。

This paper presents a new method to compute material damping of concrete-filled steel tube (CFST). Based on the study of material damping and stress amplitude relation by Lazan, the area of hysteresis loop of CFST components under axial cycle load is calculated with with bilinear steel constitution model, confined concrete constitution model and loading-unloading law by OpenSEES system, obtaining energy dissipation of concrete. It is indicated that energy dissipation per unit of reinforced concrete increases with the increase of maximum stress amplitude and decreases with the increase of concrete strength and ratio of steel area and total area. The relation formula of energy dissipation of CFST is established by nonlinear regression with SPSS and will be helpful in material behavior study of CFST and dynamic response computation of CFST structures.