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带约束拉杆十形截面钢管内核心混凝土的等效单轴本构关系
引用本文:左志亮,蔡健,林焕彬,钱泉,段伟宁.带约束拉杆十形截面钢管内核心混凝土的等效单轴本构关系[J].工程力学,2012,29(2):177-184.
作者姓名:左志亮  蔡健  林焕彬  钱泉  段伟宁
作者单位:华南理工大学土木工程系, 广州 510641;2. 亚热带建筑国家重点实验室, 广州 510641
基金项目:国家自然科学基金项目(50878087);亚热带建筑科学国家重点实验室项目(2011ZC25)
摘    要:介绍了11 个带约束拉杆和5 个不带约束拉杆的十形截面钢管混凝土轴压短柱试件的试验研究,讨论在不同约束拉杆间距与直径、钢板厚度与屈服强度、截面尺寸下试件的破坏与承载力特点。分析了带约束拉杆十形截面钢管混凝土的约束特点。在合理假定的基础上,将十形钢管混凝土截面划分成1 个无拉杆的方形和4 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,建立了力学概念清晰的各区域核心混凝土等效单轴本构关系。采用建议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。

关 键 词:十形钢管混凝土    短柱    约束拉杆    轴压    试验研究    本构关系
收稿时间:2010-05-24

EQUIVALENT UNIAXIAL CONSTITUTIVE RELATIONSHIP FOR THE ENCASED CONCRETE OF CROSS-SHAPED STEEL TUBULAR WITH BINDING BARS
ZUO Zhi-liang,CAI Jian,LIN Huan-bin,QIAN Quan,DUAN Wei-ning.EQUIVALENT UNIAXIAL CONSTITUTIVE RELATIONSHIP FOR THE ENCASED CONCRETE OF CROSS-SHAPED STEEL TUBULAR WITH BINDING BARS[J].Engineering Mechanics,2012,29(2):177-184.
Authors:ZUO Zhi-liang  CAI Jian  LIN Huan-bin  QIAN Quan  DUAN Wei-ning
Affiliation:Civil Engineering Department, South China University of Technology, Guangzhou 510641, China;2. State Key Laboratory of Subtropical Building Science, Guangzhou 510641, China
Abstract:The behaviors of cross-shaped concrete-filled steel tubular(CFT) stub columns subjected to axial loads were experimentally investigated,including 11 specimens with binding bars and 5 specimens without binding bars.The effects of space and diameter of binding bars,thickness and strength of steel plates and section sizes on the failure mode and bearing capacity are discussed.The results indicate that,with the setting of binding bars,the buckling modes of the steel plates are changed,the local buckling of the steel plates is delayed,and the bearing capacity and ductility of the cross-shaped CFT stub columns are improved.Based on reasonable assumptions,the cross-section is divided into a square section and four rectangular sections,in which the rectangular sections have binding bars while the square section has not.The constitutive relationship of confined concrete is adopted to build the equivalent uniaxial constitutive relationship for the core concrete of each section.The results of load-strain curves calculated by the proposed constitutive relationship are in good agreement with the experimental ones.
Keywords:cross-shaped concrete-filled steel tube  stub column  binding bars  axial compression  experimental research  constitutive relationship
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