圆钢管混凝土(CCFST)短柱轴心受压承载力的统计分析

Statistical analysis of axial capacity of circular concrete-filled steel tube(CCFST)stub columns

针对广泛收集的529根圆钢管混凝土(circular concrete-filled steel tube,CCFST)短柱轴心受压试验结果,以套箍系数、混凝土强度、钢材强度和钢管直径为参数,分析GB 50936—2014《钢管混凝土结构技术规范》中CCFST短柱轴心受压承载力计算公式的准确性和适用性。分析结果表明,GB 50936—2014《钢管混凝土结构技术规范》虽可以合理预测CCFST短柱的轴压承载力,但结果的离散性较大,且在某些参数超出规范限值时偏于不安全。基于分析结果,综合考虑到混凝土强度效应、钢材强度效应,并引入尺寸效应,提出一个新的CCFST轴压短柱承载力的计算公式,该公式在预测CCFST轴压短柱承载力时离散性更小,并且适用范围更广。

Based on the widely-collected test results of529circular concrete-filled steel tube(CCFST)stub columns under axial compression,the parameters including confinement factor,concrete strength,steel strength and diameter of steel pipe were collected to analyze the accuracy and applicability of technical code for concrete filled steel tubular structures(GB50936-2014)in calculating the axial capacity of CCFST stub columns.The analysis showed that although technical code for concrete filled steel tubular structures(GB50936-2014)can reasonably predict the axial capacity of CCFST stub columns,the results were discrete and insecure when some parameters exceeded the specification limits.According to the results,taking into account the effects of concrete strength,steel strength and column size,a new formula that was less discrete in predicting the axial capacity of CCFST stub columns was proposed and it had a wider application range.