钢管混凝土轴压构件耗能计算及单位体积耗能公式建立  

Computation and formulation for material damping of a concrete-filled steel tube under axial cyclic load

作　　者：王元丰[1] 文捷[1] 潘玉华[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《振动与冲击》2010年第4期12-16,共5页Journal of Vibration and Shock

基　　金：国家"十一五"科技支撑计划项目(2006BAJ27B02);国家自然科学基金项目(50778020)

摘　　要：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。A new method to compute material damping of a concrete-filled steel tube(CFST)was presented.Based on the relation between material damping and stress amplitude by Lazan,the area of hysteresis loop of a CFST under axial cyclic load was calculated with a bilinear steel constitutive model,a confined concrete constitutive model and the loading-unloading law for a OpenSEES system,the energy dissipation per unit volume of the CFST was obtained.The results indicated that the energy dissipation per unit volume of the CFST increases with increase in maximum stress amplitude and decreases with increase in the concrete strength and the ratio of steel area to the total area of the cross section.The computation formula for the energy dissipation per unit volume of the CFST was established by using nonlinear regression with SPSS software and it would be helpful in material behavior study on CFST and dynamic response computation of CFST structures.

关 键 词：钢管混凝土 材料阻尼 本构关系 滞回曲线 应用公式 

分 类 号：TU311.3[建筑科学—结构工程]