钢管混凝土构件承载力影响因素研究  

Research on Influencing Factors of Bearing Capacity of Concrete-filled Steel Tubular Members

作　　者：谢开仲 梁亦登 王红伟[1] 赵晓亮[1] 魏勇 XIE Kaizhong;LIANG Yideng;WANG Hongwei;ZHAO Xiaoliang;WEI Yong(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Ministry Education of Engineering Disaster Prevention and Structural Safety,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学土木建筑工程学院,南宁530004 [2]广西大学防灾减灾与工程安全重点实验室,南宁530004

出　　处：《铁道标准设计》2021年第4期104-109,共6页Railway Standard Design

基　　金：国家自然科学基金重点项目(51738004);国家自然科学基金项目(51868007,51368005,51878186);广西科技重大专项(桂科AA18118029)。

摘　　要：为了深入研究钢管混凝土柱的受力机理,开展了9个钢管混凝土柱的轴压和偏压试验,建立有限元软件ANSYS精确数值模型,重点分析材料等级、偏心率、径厚比和长径比等试验因子对钢管混凝土柱极限承载力的影响规律,可以发现数值分析结果与试验观测数据几乎一致,验证了数值模型的准确性,两者研究结果表明:钢管混凝土构件极限承载力和核心混凝土强度呈线性相关关系,C50核心混凝土构件比C30核心混凝土构件的极限承载力要高出25%左右;外包钢管对核心混凝土的约束效果随着径厚比增大而减弱,当短柱径厚比从20变化到40时,构件的极限承载力减少21%;加载偏心位置对构件承载力有较大影响,偏心率达到0.3时,构件极限承载力折减可达30%~40%。In order to deeply study the mechanical mechanism of concrete filled steel tube(CFST)columns,the axial and bias tests of nine CFST columns are carried out.The accurate numerical model of finite element software ANSYS is established,focusing on the analysis of the influence of test factors such as material grade,eccentricity,diameter-thickness ratio and length-to-diameter ratio on the ultimate bearing capacity of CFST columns.It can be found that the numerical analysis results are almost consistent with the experimental observation data,which verifies the accuracy of the numerical model.The results of the two studies show that:there is a linear correlation between the ultimate bearing capacity of CFST members and the strength of core concrete,and the ultimate bearing capacity of the C50 core concrete member is about 25% higher than that of the C30 core concrete member;the restraining effect of the external steel tube on the core concrete weakens as the diameter-thickness ratio increases;when the diameter-thickness ratio of the short column is changed from 20 to 40,the ultimate bearing capacity of the member is reduced by 21%;the eccentric loading position has a greater impact on the bearing capacity of the member;when the eccentricity reaches 0.3,the ultimate bearing capacity of the member can be reduced by 30% to 40%.

关 键 词：钢管混凝土柱 极限承载力 轴心受压 偏心率 约束效应 

分 类 号：TU398.9[建筑科学—结构工程]