工程力学 ›› 2018, Vol. 35 ›› Issue (12): 134-142.doi: 10.6052/j.issn.1000-4750.2017.09.0717

• 土木工程学科 • 上一篇    下一篇

钢管混凝土组合柱压弯性能试验及承载力计算

柯晓军1,2, 苏益声1,2, 商效瑀3, 孙海洋1   

  1. 1. 广西大学土木建筑工程学院, 工程防灾与结构安全教育部重点实验室, 南宁 530004;
    2. 广西防灾减灾与工程安全重点实验室, 南宁 530004;
    3. 东北电力大学建筑工程学院, 吉林 132012
  • 收稿日期:2017-09-15 修回日期:2018-01-16 出版日期:2018-12-14 发布日期:2018-12-14
  • 通讯作者: 柯晓军(1985-),男,江西九江人,副研究员,博士,硕导,从事钢与混凝土组合结构、高性能混凝土结构研究(E-mail:xj-ke@163.com). E-mail:xj-ke@163.com
  • 作者简介:苏益声(1956-),男,湖南醴陵人,教授,硕士,博导,从事钢结构、钢与混凝土组合结构研究(E-mail:suyisheng@sina.com);商效瑀(1986-),男,吉林白城人,讲师,博士,从事工程材料及结构抗震研究(E-mail:shangxujin2@163.com);孙海洋(1988-),男,河南周口人,助理工程师,硕士,从事钢结构施工控制研究(E-mail:781016539@qq.com).
  • 基金资助:
    国家自然科学基金项目(51508112,51668007,51468003);广西自然科学基金项目(2015GXNSFBA139210);广西重点实验室系统性研究项目(2016ZDX02)

STRENGTH CALCULATION AND ECCENTRIC COMPRESSIVE TEST OF STEEL TUBE-REINFORCED CONCRETE COMPOSITE COLUMNS

KE Xiao-jun1,2, SU Yi-sheng1,2, SHANG Xiao-yu3, SUN Hai-yang1   

  1. 1. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;
    2. Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, China;
    3. School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin 132012, China
  • Received:2017-09-15 Revised:2018-01-16 Online:2018-12-14 Published:2018-12-14

摘要: 现行叠合柱规程CECS188:2005计算钢管混凝土组合柱压弯承载力时,不计钢管作用影响,构件承载能力未充分利用。为此,该文通过钢管混凝土组合柱偏心受压试验,考察破坏形态及约束机理,完善压弯承载力计算理论。研究表明:钢管混凝土组合柱发生大、小偏心受压破坏,以受拉区纵筋达到屈服强度,同时混凝土受压边缘达到极限压应变为界限破坏准则;截面应变符合平截面假定,其中钢管横向应变随着偏心距减小而增大,即钢管约束作用增强,倾向于轴心受压构件而不可忽略;最后提出能够考虑钢管及其约束作用的正截面压弯承载力计算公式,通过40组试验样本的验证表明,该方法计算合理可靠,可用于指导设计。

关键词: 钢管混凝土, 组合柱, 偏心受压, 压弯性能, 承载力计算

Abstract: According to Technical Specification for Steel Tube-Reinforced Concrete Column Structure, the compression-bending capacity of a steel tube-reinforced concrete composite column without considering the steel tube is not fully utilized. Therefore, the failure pattern and confinement mechanism through eccentric compressive test was performed to complement the existing calculation theory in this paper. The test results show that failure patterns of all specimens are divided into two types, namely the large and the small eccentric failures, whose demarcation failure criterion is that the tensile reinforcements reach the yield strength and the concrete compressive edge reaches the ultimate compressive strain. Furthermore, the cross-section strain obeys the plane section assumption, and the transverse strain of steel tube increases with the decreasing of eccentricity, which fails to yield at the peak loading and is not negligible. Finally, a formula is proposed to calculate the compression-bearing capacity considering the influence of steel tube and its restraining action. Based on 40 groups of test data from this paper and other references, this calculated formula proves to be reasonable, and can be used to guide the design for steel tube-reinforced concrete composite column.

Key words: CFST, composite column, eccentric compressive, compression-bending performance, bearing capacity calculation

中图分类号: 

  • TU398+.9
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