Fatigue Strength and Fatigue Life Evaluation of National Cultural Relic Steel Bridges
This paper is regard with material mechanics, fatigue and fracture properties of Lanzhou Yellow River Iron Bridge, which is an old metal bridges built about 100 years ago. An original steel angel cut off from Lanzhou Yellow River Iron Bridge was used to carry out series of tests including material properties, fracture toughness and fatigue strength of riveted joints. The results have shown that the strength of the old steel is relatively equal to A3 steel in the old code, and the ductile-brittle transition temperature is nearly -23°C,which means that the structure is unsafe in winter due to the cold climate conditions of Lanzhou city. The main regression parameters of the fatigue crack growth rate are C=7.88×10-12m/cycle and m=3. According to the test result, the fatigue strength of tensional plate specimens with new drilling hole is similar to the category 140 in the EUROCODE. Based on the tested result, the remaining fatigue life of Lanzhou Yellow River Iron Bridge was evaluated using S-N curve and fracture mechanics method. It can be concluded that two kinds of adverse loading situations should be restricted including people loading only on half of bridge, and truck load over 120kN.
national cultural relic steel bridges fatigue strength,fracture toughness,fatigue crack growth rate,fatigue life
Chun-Sheng Wang Lan Duan Shi-Chao Wang Jing-Yu Hu
Engineering Research Center for Large Highway Structure Safety of Ministry of Education,College of Highways,Changan University,710064,China
国际会议
北京
英文
1-7
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）