期刊论文

Experimental and Numerical Study on Fatigue Crack Growth of Bridge Suspender

中文

Dizhen Xuekan

1003-868X

2019

39

1

23-30

10.13409/j.cnki.jdpme.2019.01.004

2015CB057705:国家重点基础研究发展计划（973计划） 51478050:国家自然科学基金 51778068:国家自然科学基金 2017JJ3325:湖南省自然科学基金 17B012:湖南省教育厅科学研究项目

本校为第一机构

反复车辆荷载作用下,斜拉桥斜拉索及拱桥吊杆疲劳损伤问题日益严重。针对大跨桥梁中常用的镀锌高强钢丝,开展了应力比R分别为0.1、0.2、0.3的疲劳裂纹扩展试验,研究了应力比及应力幅对钢丝疲劳裂纹扩展性能的影响,每种应力比下的应力幅分别为140.4、152.1、163.8、175.5MPa。采用分步加载方法,设计不同加载应力幅在试件断裂面留下裂纹扩展时的条纹特征,利用光学显微镜对疲劳断口的疲劳条纹进行观测,得到了不同应力比下裂纹扩展深度与疲劳循环次数的a—N曲线,拟合了高强钢丝的疲劳裂纹扩展速率模型。试验结果表明:钢丝疲劳裂纹呈三阶段扩展,随着应力比R的增大,Paris公式中参数C变小,m变大。运用有...

The fatigue damage for cable-stayed bridge cable and arch bridge hanger become serious under cyclic loadings.The fatigue crack growth tests for galvanized high strength steel wires that are widely used in large-span bridges were performed with stress ratios of R=0.1,0.2 and 0.3.The effects of stress ratio and stress amplitude on the fatigue crack propagation of steel wires were studied,and four stress amplitudes were considered,i.e.140.4 MPa,152.1 MPa,163.8 MPa and 175.5 MPa.A two-step loading method was selected in the tests.Fatigue stripes were presented in the fracture surface using differe...