带约束拉杆方形钢管混凝土柱偏压承载力特性  

Behavior of square CFT columns with binding bars subjected to eccentric loading

作　　者：蔡健[1,2] 朱昌宏[2] 苏广群[2] 

机构地区：[1]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640 [2]华南理工大学土木与交通学院,广东广州510640

出　　处：《广西大学学报（自然科学版）》2010年第4期524-530,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(50878087)

摘　　要：采用带约束拉杆方形钢管混凝土的本构关系,利用基于纤维模型法的非线性分析程序对带约束拉杆方形钢管混凝土短柱承载力进行数值计算,计算结果与试验结果吻合良好。对带约束拉杆方形钢管混凝土偏压短柱进行参数分析的结果表明,随着约束拉杆间距的减少、直径的增大,偏压短柱的极限承载力增大;随着钢管壁厚的增大,偏压短柱的N/Nu-M/Mu曲线往内收拢;随着混凝土强度和钢材强度的提高,偏压短柱的N/Nu-M/Mu曲线向外凸出;双向偏压短柱的极限承载力在最大主惯性轴方向达到最大,在最小主惯性轴方向达到最小;各参数对单向偏压和双向偏压短柱的N/Nu-M/Mu曲线的影响相类似。Based on the constitutive relationship of square CFF with binding bars, numerical analysis of the bearing capacity of square CFT stub columns with binding bars subjected to eccentric loading was carried out using the fiber model method. The analysis results were in good agreement with the experimental ones. The parameter analysis results of the bearing capacity of the CFT stub columns indicated that the ultimate bearing capacity increases with the reduction of spacing and the increment of diameter of binding bars, N/Nu - M/Mu curves were interior convex as the tubes were thickened, and outer convex while the concrete strength and steel yield strength were increased. The maximum value of ultimate bearing capacities of stub columns subjected to biaxial eccentric 1 appeared at the direction the direction of the maximum oading principal axis of inertia, and the minimum one appeared at of minimum. The influence of parameters on N/N - M/Mu curves of stub columns subjeered to uniaxial and biaxial eccentric loading was similar.

关 键 词：方形钢管混凝土 短柱 约束拉杆 承载力 数值分析 

分 类 号：TU398[建筑科学—结构工程]