铁道科学与工程学报2018，Vol.15Issue(1)：118-128,11.
某正交异性板钢桥弧形切口疲劳开裂的现场监测分析
Field monitoring analyses of diaphragm cutout fatigue cracking at an orthotropic steel bridge
摘要
Abstract
The cutout cracking was occasionally happened at early constructed orthotropic steel bridge, the relevant report of its fatigue field measurement under random traffic had not seen at home and abroad. The recorded stress time histories of the cutout under random traffic were analysed to obtain stress spectrum, effective stress range and loading cycles were determined according to the damage equivalent principle, and finally to evaluate its fatigue performance based on AASHTO LRFD. The research finds that the effects the axles group could be observed at diaphragm cutout, the overloaded truck would produce significant stress response at cutout, and even exceed the design stress of steel. Diaphragm cutout was controlled by the in-plane stress, increasing the thickness of diaphragm could effectively reduce total stresses. The results show that the fatigue life was much shorter than the design life of cutout, the thin diaphragm plate, the high fraction of trucks with overweight gross weight and axle weight primary caused the bridge early fatigue cracking.关键词
正交异性钢桥面板/疲劳/弧形切口/应力监测/超载Key words
orthotropic steel bridge deck/fatigue/diaphragm cutout/stress measurement/overloaded分类
交通工程引用本文复制引用
祝志文,黄炎,陈魏,向泽..某正交异性板钢桥弧形切口疲劳开裂的现场监测分析[J].铁道科学与工程学报,2018,15(1):118-128,11.基金项目
国家重点基础研究发展计划("973"计划)资助项目(2015CB057701,2015CB057702) （"973"计划）
湖南省交通科技资助项目(201522) （201522）
