方中空夹层钢管混凝土柱的承载力及影响因素分析

Analysis of bearing and influence complications of concrete filled double skin(SHS inner and SHS outer) steel tubular columns

采用双剪统一强度理论,对轴心受压下的方中空夹层钢管混凝土短柱的受力性能进行了理论分析。引入考虑厚边比影响的等效约束折减系数和混凝土强度折减系数,将方中空夹层钢管混凝土等效为圆中空夹层钢管混凝土,在厚壁圆筒统一强度理论的基础上,结合钢管混凝土统一理论,推导出方中空夹层钢管混凝土柱的极限承载力,并对影响因素进行了分析。与有关文献的试验结果进行比较,结论基本一致,证明统一强度理论对方中空夹层钢管混凝土的理论分析有很好的适用性。该结果为方中空夹层钢管混凝土承载力的分析计算提供了一定的理论依据。

Based on unified strength theory, the load capacities of the concrete filled double skin （SHS inner and SHS outer）steel tubular eohmans under axial compression are investigate. By introducing the reduction factor of concrete strength and the equivalent restriction reduction factor,concrete filled double skin （SHS inner and SHS outer） steel tubular columns is turned to concrete filled double skin （CHS inner and CHS outer） steel tubular columns. Based on unified strength theory solutions of thick tube, combined with concrete filled skin tube unified theory. Deduce the calculation formula of bearing capacity of eonerete filled double skin steel tubular columns and analyse the influence complication. Compared with the solution obtained in this paper and the experimental results, the good agreement can be found. The results indicate unified strength theory has the good applicability and the solution has an important practical value.