钢管混凝土偏压格构柱偏心率影响试验研究

Experimental research on influence of eccentrically ratio on concrete filled steel tubular laced columns compressed eccentrically

进行了5根钢管混凝土格构柱和2根空钢管格构柱偏心受压试验,试验参数为偏心率。试验研究结果表明,随着偏心率的增加,格构柱的极限承载力逐渐降低。所有试件的近载侧柱肢始终处于小偏压状态,远载侧柱肢随试件整体偏心率的增大而由小偏压发展为大偏压状态。与空钢管格构柱相比,钢管混凝土格构柱的承载力、刚度和变形能力均较大。进行了偏心率对钢管混凝土格构柱极限承载力的影响分析。最后,对钢管混凝土设计规程的计算方法进行了探讨。

Five Concrete Filled Steel Tubular(CFST) laced columns and two steel tube laced columns subjected to eccentrically loads were tested with of eccentricities.Test results indicate that the ultimate load carrying capability of laced columns decreases with the increase of eccentricity.Longitudinal elements in the loading side of all specimens are subjected to eccentrically forces with small eccentricity during the whole process,while those away from the load are subjected to forces from small eccentricity to large eccentricity with the increase of whole eccentricity of the columns.The ultimate load-carrying capacity,stiffness and deformation capability of CFST specimens are all larger than those of hollow steel tubes.The influence of eccentricity to ultimate load-carrying capacity of CFST laced columns is analyzed.Finally,calculation methods in design criteria for CFST structures are discussed.