工形梁竖向加劲肋端部疲劳性能及加固方法研究  

Study on Fatigue Performance and Reinforcement Method of Vertical Stiffened Rib End of I-shaped Girder Webs

作　　者：王丽 WANG Li(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;State Key Laboratory of High-Speed Railway Track Technology,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司铁道建筑研究所 [2]高速铁路轨道技术国家重点实验室

出　　处：《铁道建筑》2019年第10期19-22,共4页Railway Engineering

基　　金：国家能源投资集团有限责任公司科技创新项目(SHGF-15-41)

摘　　要：对我国既有铁路钢桥调研发现有些钢梁已产生疲劳裂纹,其中工形梁腹板竖向加劲肋端部裂纹较多。随着运营列车轴重和运营时间的增加,这些裂纹可能会进一步扩展,须采取相应措施对结构予以补强。本文针对64 m下承式钢桁梁的纵梁腹板竖向加劲肋端部构造,设计疲劳试件并展开疲劳试验,得到该构造的热点应力疲劳强度,为实桥疲劳评估提供依据。通过设计节段模型进行了不同加固方法的疲劳试验,掌握了节段模型加固前后的疲劳性能,并提出了在翼缘增设角钢的加固方法。The investigation results of existing railway steel bridges in China shows that some steel girders haveproduced fatigue cracks,among which there are more cracks at the vertical stiffened rib end of I-shaped girder webs.With the increase of axle load and operation time,these cracks may further expand,so corresponding measures shouldbe taken to strengthen the structure. Based on the vertical stiffened rib end structure of the longitudinal girder web of64 m through steel truss girder,the fatigue specimen was designed and the fatigue test was carried out to obtain the hotspot stress fatigue strength of the structure in this paper,which provided the basis for fatigue evaluation of the realbridge. Through the fatigue tests of different reinforcement methods,the fatigue performance of the segment modelbefore and after reinforcement was mastered,and the reinforcement method of adding angle steel to the flange wasproposed.

关 键 词：钢桥 竖向加劲肋 疲劳裂纹 疲劳试验 加固方法 

分 类 号：TU391[建筑科学—结构工程]