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为了更直观地研究钢管混凝土构件中钢管和混凝土对整体抗弯刚度的贡献,进行了5根矩形钢管混凝土简支梁的受弯试验,并结合相关文献中的试验结果,运用线性回归的方法对钢管混凝土受弯构件抗弯刚度叠加理论中的折减系数进行研究。发现矩形和圆形钢管混凝土构件中混凝土对整体抗弯刚度的贡献优于方形截面钢管混凝土构件中的混凝土。最后,根据回归结果讨论了几个常用规范的使用范围。
In order to more intuitively study the contribution of steel pipe and concrete to the overall flexural rigidity of concrete-filled steel tubular members, the bending tests of five rectangular CFST simply supported beams were carried out. Combining with the experimental results in related literatures, linear regression method was used The reduction factor in the superposition theory of flexural rigidity of CFST members is studied. It is found that the contribution of concrete to the overall bending stiffness of rectangular and circular CFST members is better than that of square-section CFST members. Finally, the use of several commonly used specifications is discussed based on the regression results.