摘要
为研究桥梁波纹钢腹板在屈曲状态下的疲劳裂纹扩展行为,本研究选取常用桥梁波纹钢腹板,确定其基本参数。利用疲劳试验机对腹板屈曲部位施加疲劳荷载,模拟实际桥梁中该部位的受力状态。试验中,通过布置电阻应变片和位移传感器实时监测腹板的应变与位移变化,并使用超声波金属探伤仪探测内部裂纹扩展规律。结果表明:随着循环次数增加,波纹钢腹板屈曲部位的裂纹扩展显著加剧。同时,循环频率和腐蚀环境均对裂纹扩展速率产生影响,频率增加总体上导致速率加快。在腐蚀环境与疲劳循环的组合工况下,腐蚀24 h的试件裂纹扩展速率普遍高于腐蚀8 h的试件,且裂纹扩展速率随循环次数增加而上升。腐蚀时间和循环次数对裂纹扩展速率具有叠加效应,即腐蚀时间越长、循环次数越多,裂纹扩展速率越快。深入研究有助于及时发现并预防潜在安全隐患,保障桥梁服役期的安全运行。
To study the fatigue crack growth behavior of the corrugated steel web of bridges in the buckling state,this study selected the commonly used corrugated steel web of bridges and determined its basic parameters.Using a fatigue testing machine,fatigue loads were applied to the buckling part of the web to simulate the stress state of this part in actual bridges.During the test,resistance strain gauges and displacement sensors were arranged to monitor the strain and displacement changes of the web in real time,and an ultrasonic metal flaw detector was used to detect the internal crack growth patterns.The results show that with the increase in the number of cycles,the crack growth at the buckling part of the corrugated steel web significantly intensifies.At the same time,the cycle frequency and the corrosive environment both have an impact on the crack growth rate,and an increase in frequency generally leads to an acceleration in the rate.Under the combined working conditions of corrosion and fatigue cycles,the crack growth rate of the specimens that have been corroded for 24 hours is generally higher than that of the specimens that have been corroded for 8 hours,and the crack growth rate increases with the increase in the number of cycles.The combined effect of corrosion time and cycle number on the crack growth rate is that the longer the corrosion time and the more the fatigue cycles,the faster the crack growth rate.Through in-depth research of this kind,it is helpful to promptly detect and prevent potential safety hazards,and ensure the safe operation of the bridge during its service period.
作者
吴金辉
黄文霞
WU Jinhui;HUANG Wenxia(School of Construction Engineering,Zhengzhou Shengda University,Zhengzhou 451191,China)
出处
《兵器材料科学与工程》
北大核心
2025年第5期48-53,共6页
Ordnance Material Science and Engineering
基金
河南省科技攻关项目(242102320050)。
关键词
波纹钢腹板
屈曲部位
疲劳裂纹
扩展行为
裂纹扩展速率
corrugated steel web
buckling location
fatigue crack
growth behavior
crack growth rate
作者简介
第一作者:吴金辉,男,硕士,讲师。E-mail:wujinhui1515@163.com。
