方钢管混凝土柱-钢梁外环肋节点抗震性能研究

基于方钢管混凝土柱与H型钢梁外环肋节点的低周反复荷载试验,在合理选择材料本构关系、破坏准则的基础上,采用通用有限元软件ANSYS对该节点模型在循环加载作用下的受力性能进行非线性分析,对试件的试验和理论滞回曲线及骨架曲线进行对比研究。研究表明:该节点具有很好的延性和耗能能力,层间转角位移延性系数μ=3.07～3.66,弹性和弹塑性层间位移角分别为y=0.004 1～0.004 7、u=0.012 4～0.017 2,等效黏滞阻尼系数he=0.26～0.35,满足现行抗震规范要求,抗震性能良好。

STUDY ON SEISMIC BEHAVIOR OF JOINT WITH EXTERIOR DIAPHRAGMS BETWEEN CONCRETE-FILLED SQUARE STEEL TUBULAR COLUMN AND STEEL BEAM

Based on the experiments of joint with exterior diaphragms between concrete-filled square steel tubular column and steel beam under cyclic loading,with appropriate material stress-strain relations and failure criteria,the mechanical properties of this type of joint were researched by using ANSYS,finite element analyses were conducted under cyclic loading,the hysteretic and framework curves of this type joint between test and theoretical were researched.The study results showed that all specimens have good ductility and energy dissipation capacity.The story angle drift ductility ratios are μ = 3.07 ～ 3.66,the elastic and elastic-plastic story angle drift are y = 0.004 1 ～ 0.004 7 and u = 0.012 4 ～ 0.017 2,and the equivalent viscous damping coefficients are he = 0.26 ～ 0.35,which meet the needs of the current code for seismic design of building.