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| Probabilistic assessment of remaining fatigue life for existing railway steel bridges |
| Revised:August 22, 2004 |
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| DOI：10.7511/jslx20064077 |
| KeyWord:existing railway steel bridges,probabilistic fracture mechanics,fatigue reliability,probabilistic remaining fatigue life,inspection intervals |
| WANG Chun-sheng CHEN Ai-rong NIE Jian-guo CHEN Wei-zhen |
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| Abstract: |
| The remaining fatigue life and service safety of existing railway steel bridges is a topic of considerable importance,particularly for their operators.An improved method for the estimation of the actual fatigue life and safety of such structures are required in order to make their continued safe use possible while avoiding unnecessary repairs or replacements.According to the fatigue failure mechanism of existing steel bridges,two probabilistic fatigue failure models -brittle and ductile are proposed.Moreover,the corresponding limit-state equation and the basic variables are identified,and the uncertainties associated with them are quantified.A double-angle probabilistic fracture failure model(DAPFFM) of riveted bridge members is proposed.Furthermore,a reliability analysis program-DAPFF,based on Monte-Carlo method,is developed to compute the fatigue failure probability of DAPFFM.Then the probabilistic fracture assessment method is used to predict the time fatigue reliability of Ganjiang Railway Bridge of Jingjiu Railway in China.According to the assessment results of main truss members,the probabilistic remaining fatigue life,inspection intervals and maintenance strategy are determined. |
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