张卫东¹，王振波²，丁海军²

(1 淮阴工学院建筑工程学院，淮安223001；2 南京工业大学土木工程学院，南京 210009)

 

[摘要] 通过轴压试验研究了不同再生混凝土掺入量的小径厚比钢管再生混凝土短柱在荷载作用下的宏观变形特征、荷载应变关系和破坏机理，分析了代表目前钢管混凝土三种理论的计算公式的适用性。研究结果表明，取代率对钢管再生混凝土短柱破坏形态影响较小，但对极限承载力影响较大，极限承载力随着取代率的增加而下降，最大降幅约为13%。再生混凝土取代率较高时，目前三种理论计算公式计算结果偏于不安全，从收缩率角度对英国标准协会BS 5400计算公式进行修正，其计算结果与钢管普通混凝土试件计算结果具有相同的安全度。

[关键词] 小径厚比；钢管再生混凝土；轴压试验；收缩率；取代率

中图分类号：TU392-3     文献标识码：A     文章编号：1002-848X(2012)12-0086-04

 

Zhang Weidong¹, Wang Zhenbo², Ding Haijun²

(1 Faculty of Architecture and Civil Engineering, Huaiyin Institute of Technology, Huai′an 223001, China; 2 College of Civil Engineering, Nanjing University of Technology, Nanjing 210009, China)

 

Abstract: Based on axially compressive tests of recycled concrete filled steel tube short columns with small diameter-thickness ratio and different replacement percentage, macroscopic characters of deformation, force-longitudinal strain curves and failure mechanism were studied, and applicability of three theoretical calculation formulas of concrete filled steel tubes were analyzed. The test results demonstrate that the replacement percentage of recycled concrete has little influence on the mechanical properties and has great influence on the ultimate bearing capacity of the recycled concrete filled steel tube short columns. In the same condition, the bearing capacity will decrease when the replacement percentage of recycled concrete increases, and the maximum amplitude is 13%. The results based on three calculation theories can not provide proper safe when the replacement percentage is very high. The calculation formula in BS 5400 was modified according shrinkage rate，and the results have the same safety degree with common CFST specimens.

Keywords: small diameter-thickness ratio; recycled concrete filled steel tube; axial compression test; shrinkage ratio; replacement percentage

*住房与城乡建设部科学技术项目（2008-k1-11），省教育厅自然科学项目（11KJD560003），宿迁市科技局项目（B2010021），省高校“青蓝工程”优秀青年骨干教师培养对象资助。

作者简介：张卫东，硕士，讲师，Email：wdzhang@sqc.edu.cn

 

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