带约束拉杆矩形钢管混凝土柱的偏压性能  

Eccentric Compressive Behavior of Rectangular Concrete-Filled Steel Tube Columns with Binding Bars

作　　者：龙跃凌[1] 蔡健[1] 

机构地区：[1]华南理工大学土木工程系,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2008年第12期21-27,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：科技部重大基础研究前期研究专项基金资助项目(2004CCA03300);广东省自然科学基金资助项目(020965)

摘　　要：通过对7个带约束拉杆和2个不设约束拉杆矩形钢管混凝土短柱的单向偏心受压试验,研究了偏心率、约束拉杆水平间距对矩形钢管混凝土短柱偏压性能的影响.试验结果表明:约束拉杆的设置有助于提高矩形钢管混凝土偏压短柱的延性,延迟钢管的局部屈曲;带约束拉杆矩形钢管混凝土柱的偏压承载力随偏心率的增大而减小;在偏心率相同的条件下,试件延性随拉杆水平间距的减小而增大.试件承载力的数值计算结果与试验结果吻合良好,而国内现有规程的计算结果总体上低估了带约束拉杆矩形钢管混凝土偏压试件的承载力.The uniaxial eccentric compressive experiments of nine rectangular concrete-filled steel tubular stub columns, seven with and two without binding bars, were carried out. The effects of the eccentricity ratio and the horizontal spacing of the binding bars on the eccentric compressive behaviors of the columns were also analyzed. The results indicate that （ 1 ） the setting of binding bars improves the ductility of the columns and delays the local buck- ling of steel tubes; （2） the eccentric bearing strength of the columns decreases with the increase in eccentricity ratio ; and （3） the ductility of the columns with the same eccentricity ratio increases with the decrease in binding bar spacing. Moreover, the numerical results of bearing strength accord well with the experimental ones, while the resuits obtained based on the domestic design codes are much lower than the experimental ones.

关 键 词：矩形钢管混凝土柱 约束拉杆 偏压性能 延性 承载力 本构关系 

分 类 号：TU398[建筑科学—结构工程]