To study the mechanical properties of H-CFST columns under torsion-bending,quasi-static cyclic loading tests were carried out on six H-CFST columns under different section shapes and torsion-bending ratios.The failure modes,hysteretic curves,moment-displacement skeleton curves,key mechanical characteristics and stiffness degradation curves of the columns under torsion-bending were obtained.The research results are shown as follows.1) With the increase of the ratio of torsion to bending moment,the failure characteristics of the H-CFCST columns and H-CFRST columns change from "bending" type to "torsion" type.2) When the torsion moment increases to 34％ and 67％ of the bending moment,the peak bending moment of the H-CFCST columns decreases by 5.0％ and 17.7％ respectively,while the peak bending moment of the H-CFRST columns decreases by 5.5％ and 22.7％,respectively.It is shown that both the H-CFCST columns and the H-CFRST columns have good combined torsion-bending bearing capacity.3) Torque has little effect on the early flexural stiffness of the H-CFCST columns and the H-CFRST columns,but it reduces the peak secant flexural stiffness of the H-CFCST columns and the H-CFRST columns.4) The calculation method of the torsion-bending bearing capacity of the H-CFCST columns and the H-CFRST columns is proposed,and the theoretical values of the torsion-bending bearing capacity obtained by this method are in good agreement with the experimental values,which has good accuracy.The research results can improve the basic theory of composite structural members,and provide a reference for the design and calculation of the torsion-bending bearing capacity of the H-CFCST columns and the H-CFRST columns.
关键词
扭弯作用/扭弯比/内嵌H型钢-钢管混凝土柱/扭弯承载力/扭弯相关关系
Key words
torsion-bending action/ratio of torsion and bending/concrete-filled steel tubular columns with internal H-section steel/torsion-bending bearing capacity/torsion-bending correlation
维普
万方数据