基于性能的三层全钢管混凝土框架试验研究

摘要

为了研究全钢管混凝土框架结构的抗震性能,对一榀单跨3层方钢管混凝土柱-矩形钢管混凝土梁框架结构进行拟静力试验,研究了该结构的滞回性能、延性、承载力与刚度退化、耗能能力等性能指标,并通过有限元模拟,分析了矩形钢管混凝土梁的受力机理.研究结果表明:此类全钢管混凝土框架结构滞回曲线饱满,延性系数大于3,层间位移转角在1/43～1/27之间,层间塑性变形能力随着框架柱长细比及梁柱线刚度比的增加逐渐减小,等效粘滞阻尼系数在0.115 ～0.441之间,强度退化不明显,但刚度退化较为明显;在加载过程中,梁端、柱根部屈服后,随着荷载的增加,中和轴向受压区逐渐移动,极限荷载时混凝土受拉区达到最大.%To study the seismic performance of concrete-filled steel tubular(CFST) frame structure,the quasi-static test on a three-story frame structure consisting of square CFST column and rectangular CFST beam was carried out.The hysteretic behavior,ductility,bearing capacity,stiffness degradation,energy dissipation capacity and other performance indicators were studied,and finite element simulation was used to analyze the mechanical behavior of concrete-filled rectangular steel tubular beams.Results show that the hysteretic curve of concrete-filled steel tubular frame structure is plump.Its ductility coefficient is greater than 3.The inter-story drift ratio falls in the range of 1/43 to 1/27.The inter-story plastic deformation capacity decreases with the increase of slenderness ratio of frame column and the stiffness ratio of the beam and column.The equivalent viscous damping coefficient is within the range of 0.115 to 0.441.The strength degradation is not obvious,but the stiffness degradation is more obvious.With the increase of load,if the beam or column yields,the neutral axis gradually moves to compressive zone;and the tension zone of concrete reaches the maximum area when load reaches the maximum.