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。
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 charac-teristics,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 mechani-cal 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.
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2014年第5期18-23,共6页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(50978221)
中央高校基本科研业务费专项资金资助项目(0009-2014G1211002)
关键词
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
reinforced concrete arch rib
hooping strengthening
young-old concrete interface
mechanical behavior
test analysis
bearing capacity
