钢管混凝土柱稳定系数的统一算法研究

Study of unified calculation method for the stability factor of concrete filled steel tubular laced columns

介绍了美国《建筑钢结构规范》(AISC-LRFD)和欧洲《钢-混凝土组合结构设计规范》(Eurocode 4)中关于钢管混凝土柱稳定系数的计算方法。无论钢管混凝土单肢柱或是钢管混凝土格构柱,均可先计算柱的相对长细比,再通过相应公式计算其稳定系数。采用该研究思路,在分析评价国内外各设计规程计算方法的基础上,提出适合工程应用的钢管混凝土柱稳定系数的统一算法。对钢管混凝土单肢柱、哑铃形柱、格构柱分别进行该算法的试验验证,研究结果表明,计算值与试验值均吻合良好。

Calculation methods for the stability factor of CFST columns from foreign design criteria （including the American institute of steel construction AISC-LRFD and the European design of composite steel and concrete structures ECA） are introduced. Either for CFST single tube column or CFST laced column, the method, in which the relative slenderness ratio of the column is calculated first and stability factor is then obtained from the corresponding formula, can be applicable. Following this idea, a unified method for calculating the stability factor of CFST columns is put forward on the base of analysis of the calculation methods of domestic and international design criteria. Test verifications of the new calculation method on CFST single tube columns, dumbbell shaped columns and laced columns are presented, and the results indicated that the calculated values of stability factors using this new method agree well with the test values.