带约束拉杆异形截面钢管内核心混凝土等效单轴本构关系  

Equivalent uniaxial constitutive relationship for core concrete of specially-shaped steel tubular column with binding bars

作　　者：蔡健[1] 左志亮[2] 谢小东[2] 陈映瑞[2] 陈庆军[2] 

机构地区：[1]华南理工大学亚热带建筑国家重点实验室,广东广州510641 [2]华南理工大学土木工程系,广东广州510641

出　　处：《建筑结构学报》2011年第12期186-194,共9页Journal of Building Structures

基　　金：国家自然科学基金项目(50878087);中央高校基本科研业务费专项资助(2011ZM0112);广东省自然科学基金项目(9451064101002910)

摘　　要：在钢板中部位置设置具有约束钢板外凸变形作用的水平拉杆,是改善异形截面钢管混凝土柱力学性能的有效方法。在已有文献对带约束拉杆方形、矩形、L形、T形、十形截面钢管混凝土短柱轴压试验研究成果的基础上,通过合理假定,将L形、T形和十形钢管混凝土截面分别划分成一个无拉杆的方形和若干个有拉杆的矩形钢管混凝土区域,借鉴约束混凝土本构模型,分别建立力学表达格式统一的带约束拉杆方形和矩形截面、以及带约束拉杆L形、T形、十形截面各区域的钢管内核心混凝土等效单轴本构关系。采用所建立的本构关系对相关试验的试件进行了荷载-应变全过程分析,计算曲线和试验曲线吻合良好。The mechanical behavior of specially-shaped concrete-filled steel tubular（CFT） columns can be effectively improved by setting binding bars in the middle positions of the steel plates,since the out-of-plane deformation of steel plates is constrained by the binding bars.Based on the experimental results about the square,rectangular,L-shaped,T-shaped and cross-shaped CFT stub columns with binding bars subjected to axial load and reasonable assumptions,the L-shaped,T-shaped and cross-shaped section can be divided into a square and several rectangular regions,respectively,where the rectangular regions have binding bars while the square region does not.The constitutive relationship of the confined concrete is referred as the development of the equivalent uniaxial constitutive relationship for the core concrete of the square and rectangular CFT stub columns with binding bars and the divided regions of the L-shaped,T-shaped and cross-shaped CFT stub columns with binding bars.The proposed equivalent uniaxial constitutive relationship is based on clear mechanical concept and has uniform expressing formats.The results of the load versus strain curves calculated by the proposed constitutive relationship are in good agreement with the experimental ones.

关 键 词：异形钢管混凝土短柱 约束拉杆 核心混凝土 等效单轴本构关系 

分 类 号：TU398.2[建筑科学—结构工程] TU528.59