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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第11卷    第4期    总第60期    2014年8月

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文章编号:1672-7029(2014)04-0051-07
二次受力下自密实混凝土加固梁抗剪性能试验研究
王国杰1,2,郑建岚1,2

(1.福建江夏学院 工程学院, 福建 福州 350108;
2.福建省环保节能型高性能混凝土协同创新中心,福建 福州 350108
)

摘 要: 对7根自密实混凝土(SCC)加固梁和2根对比梁进行二次受力下的抗剪性能试验。试验采用三面U型增大截面形式,在初始受力不变的情况下进行自密实混凝土加固。研究不同初始受力,不同加固厚度及不同新老混凝土界面处理方式下加固梁的受剪破坏特征、承载力和新旧钢筋应变的变化规律。试验结果表明:采用自密实混凝土加固钢筋混凝土梁,新老混凝土共同工作性好,能够显著地提高钢筋混凝土梁的抗剪承载力。根据试验结果,得到二次受力下自密实混凝土加固梁的受剪承载力计算公式,计算结果与试验结果吻合较好。

 

关键字: 自密实混凝土;抗剪承载力;加固;钢筋混凝土梁;二次受力

Experimental investigations on shear behavior of beams strengthened by SCC under secondary load
WANG GuoJie1,2, ZHENG Jianlan1,2

1. School of Engineering, Fujian Jiangxia University, Fuzhou 350108, China;
2. Collaborative Innovation Center for Environment-friendly and Energy-saving HPC in Fujian Province, Fuzhou 350108, China

Abstract:Seven initially loaded beams strengthened by self-compacting concrete (SCC) and two comparative beams were experimentally investigated. The beam cross sections were U-shaped enlarged form by self-compacting concrete under constant initially load. With different initial load, the shear failure characteristics, bearing capacity and the change law of strain in the old steels and new steels were analyzed under different enlargement thickness and different interface treatments. The results show that the co-operational performance of the old concrete and new self-compacting concrete is good, which can significantly improve the shear bearing capacity in self-compacting concrete strengthened beams. According to the test results, the shear capacity formula of the beams strengthened by SCC under secondary load was obtained, and it showed good agreement with the experimental results.

 

Key words: self-compacting concrete (SCC); shear capacity; strengthening; reinforced concrete beams; secondary load

ISSN 1672-7029
CN 43-1423/U

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