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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第11卷    第5期    总第61期    2014年10月

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文章编号:1672-7029(2014)05-0018-06
套箍加固拱肋力学性能模型试验研究
孙昊1,钱永久2

(1.长安大学 公路学院,陕西 西安 710064;
2.西南交通大学 土木工程学院,四川 成都 610031
)

摘 要: 为分析套箍加固拱肋的基本力学性能及加固效果,进行套箍加固拱肋和整体浇筑拱肋的对比模型试验,对比分析套箍加固试件的裂缝发展规律、破坏模式与特征、承载能力和新老混凝土结合面的工作性能。试验结果表明:套箍加固模型和整体浇筑模型的裂缝分布规律、破坏过程、破坏模式相同,破坏时挠度相差0.5 mm,破坏荷载相差2.7%,说明二者的力学性能基本相同;试验过程中测试的新老混凝土结合面最大剪应力远小于其承载能力,加载过程中跨中截面测试应变在开裂前符合平截面假定,说明新老混凝土能够作为整体共同受力。通过对比模型试验分析,证明套箍技术加固拱肋是可靠有效的加固方法。

 

关键字: 钢筋混凝土拱肋;套箍加固;新老混凝土结合面;力学性能;试验分析;承载能力

Model test on mechanical performance of hooping strengthening arch rib
SUN Hao1, QIAN Yongjiu2

1. School of Highway, Chang’an University, Xi’an 710064, China;
2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

Abstract:In order to estimate the fundamental mechanical performance and effect of hooping strengthening arch rib, comparative analysis was performed to analyze the crack development regulation, failure process and characteristics, bearing capacity and the performance of young-old concrete interface. The test results show that crack distribution regulation, failure process and mode of the two specimens were identical-the deflection difference of failure state was 0.5 mm and the difference of failure load was 2.7%, which means that the structural mechanical performance of hooping strengthening arch rib is as same as that of the integrated pouring arch rib. In the loading process, the measuring maximum shear stress of the young-old concrete interface was much smaller than its bearing capacity, and the testing strain of midsection before cracking basically complied with the plane section assumption, which shows that the young-old concrete could work together. Through the analysis of comparative model test, it shows that hooping strengthening technique is reliable and effective for reinforcing arch rib.

 

Key words: reinforced concrete arch rib; hooping strengthening; young-old concrete interface; mechanical behavior; test analysis; bearing capacity

ISSN 1672-7029
CN 43-1423/U

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