V型缀管钢管混凝土格构柱极限承载力试验

目的对钢管混凝土之间采用V型钢管连接的格构柱进行试验研究，探讨V型缀管钢管混凝土格构柱承载能力及其实用算法．方法采用柱轴压和偏压试验研究，对不同长细比和偏心率的格构柱进行承载力试验，建立经过验证的有限元模型，确定格构柱承载力的双参数计算方法．结果斜缀管为压弯受力或拉弯受力且受力较大；柱肢之间受力有一定差别；随着长细比的增加，试件由分肢屈曲向整体失稳转变．长细比较小的试件其承载力应进行单肢承载力验算．结论V型缀管格构柱存在相关屈曲的问题，得到了V型缀管钢管混凝土格构柱考虑偏心率折减系数和稳定系数的极限承载力计算方法．

Experimental Research on Ultimate Load-Carrying Capacities of V-Shape Concrete Filled Steel Tubular Laced Columns

This paper presents an experimental study on the V-shape concrete-filled steel tube （CFST）laced column. The test parameters are column slenderness and eccentricity. The deformation process, failure modes and strains of specimens on the longitudinal chords and diagonal lacing are analyzed. The failure characteristic of a specimen on whole and local, failure mechanism and ultimate load carrying capacity of the CFST laced column are studied. Test results show that axial force and bending moment are dominate forces on lac- ing bars of the specimens unlike axial force in lacing bars in the laced column with transverse struts, and strains of lacing bar are much larger than that of the latter. Tliere is differential axially force between longitudinal chords. With the increase of slenderness the column behavior shifts towards global stability from local buckling. The load bearing capacities for single chord of stub column should be checked in calculation. Based on the analysis of experimental results, the calculating method is presented for eccentricity reduction coefficient and stability coefficient. Finally the calculating formula of the V-shape lacing CFST laced column ultimate load carrying capacity is presented.