Abstract：Research purposes: Cracks and etched surface occur on the web，bottom plate and cross beam of bottom railway steel bridge. These are the common disasters after the bridge services for many years. The overall understanding of causes for the disaster is sought in this paper.
Research methods: The structure stress analysis is made to the bridge by adopting finite-element software. The fatigue estimation is made to the crack position and the feasible demonstration is done to the reinforcement measures through analysis of chemical constitution by doing chemical experiment to the steel.
Research conclusions:(1) The horizontal crack on the web plate of longitudinal beam is caused by damage by hard matter and the bottom vertical crack on the web plate in end section of longitudinal beam is caused by fatigue. (2) The bedded crack on low plain longitudinal node plate is caused by rejected steel quality and slag inclusion in interlayer while smelting. (3) The etched concave surface on cross beam is caused by long-time erosion of sewage on the bridge dropping from train.(4 ) The internal force distribution of longitudinal beam is changed and stress level of longitudinal beam is improved by adopting the method of pasting steel plate on crack position for reinforcing longitudinal beam. In this way, the bridge can meet the requirement of bearing capacity.
王子健，李俊，李小珍，司秀勇. 下承式铁路钢桥的病害原因分析及加固措施论证[J]. 铁道工程学报, 2006, 23(2): 43-46.
WANG Zi-jian, LI Jun, LI Xiao-zhen, SI Xiu-yong. ANALYSIS OF CAUSES FOR DISASTER OF ONE RAILWAY STEEL BRIDGE AND DEMONSTRATTON OF REINFORCEMENT MEASURES FOR BRIDGE. 铁道工程学报, 2006, 23(2): 43-46.
2006, Vol. 23 
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