作　　者： ; ; ;

机构地区： 华南理工大学建筑学院亚热带建筑科学国家重点实验室

出　　处： 《建筑结构学报》 2009年第S1期187-190,共4页

摘　　要： 短柱轴压承载力是钢管混凝土最重要的力学指标之一,但目前对钢管高强混凝土力学性能的研究不够深入,强度指标不统一,各种计算方法差异较大,给工程应用带来困难。通过分析和对比11种国内外规程中计算钢管高强混凝土轴压承载力公式的差异,根据计算理论将其分为三类:套箍混凝土理论、统一理论、叠加计算理论。结合3个大尺寸轴压短柱试验研究结果,指出基于统一理论和叠加计算理论的结果较试验值低9%~31%,偏于保守;而《高强混凝土结构技术规程》(CECS 104∶99)的计算值与试验结果最为吻合且偏于安全,适用于工程实际;4种国外规程对钢管作用于混凝土的环箍效应考虑较少甚至不考虑,不能充分利用钢管混凝土的承载能力,在进行计算或设计时值得注意。 Bearing capacity of short columns under axial compression is an important mechanical index for concrete filled steel tubular(CFST) structures.The lack of intensive researches and the existence of inconsistent formulas lead to difficulties in practical application of high strength CFST structures.This paper analyses and compares the bearing capacity formulas under axial compression of high strength CFST short columns from 11 different specifications,which are divided into three categories according to the calculating theory: confined concrete theory,unification theory and superposition principle theory.The formulas are compared with test results of three large scale short column specimens under axial compression,it is found the results based on unification theory and superposition principle theory generate 9%~31% lower estimates than experiment results.On the other hand,the formula from 'Technical specification for high strength concrete structures(CECS 104∶ 99)' has good agreements with the experimental results.Therefore,specification CECS 104∶ 99 is proposed for practical poject.It is noteworthy that the confined effect on core concrete provided by steel tubes is taken into lower or no account in specifications of Europe,Japan and US,which will lead to underestimated concrete strength in structural design.

关 键 词： 钢管高强混凝土 短柱 轴压承载力 计算理论

领　　域： [建筑科学]