冻融循环作用后钢管混凝土柱参数分析

Parametric Analysis of Concrete Filled Steel Tubular Columns Under Freeze-thaw Cycles

采用验证的有限元模型,考虑钢管径厚比、混凝土强度、钢管屈服强度、冻融循环次数等参数变化,对冻融循环作用后圆钢管混凝土短柱力学性能指标,进行单一因素,多因素耦合参数分析。从中提出冻融循环作用后,考虑多因素耦合承载能力折减系数计算公式,耦合效应折减系数拟合公式计算结果与试验结果吻合较好,为北方寒冷地区钢管混凝土结构剩余承载力评估提供理论支撑。

This paper employs a validated finite element model to investigate the influence of various parameters,including the diameter-thickness ratio of the steel tube,concrete strength,yield strength of the steel pipe,and number of freeze-thaw cycles,on the mechanical properties of circular steel tube concrete short columns.Through single-factor and multi-factor coupled parameter analyses,we examine the interplay of these factors on the mechanical performance index of the short columns.A formula for calculating the discount factor of load capacity considering multi-factor coupling after freezing and thawing cycles is proposed,and the results of the formula for fitting the discount factor of coupling effect are in good agreement with the experimental results,which provides theoretical support for the assessment of the residual load capacity of concrete filled steel tubular columns in the northern cold region.