| 王春生,陈艾荣,聂建国,陈惟珍.既有铁路钢桥剩余疲劳寿命的概率性评估[J].计算力学学报,2006,23(4):408~413 |
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| 既有铁路钢桥剩余疲劳寿命的概率性评估 |
| Probabilistic assessment of remaining fatigue life for existing railway steel bridges |
| 修订日期：2004-08-22 |
| DOI：10.7511/jslx20064077 |
| 中文关键词: 既有铁路钢桥 概率断裂力学 疲劳可靠度 概率疲劳剩余寿命 检测间隔 |
| 英文关键词:existing railway steel bridges,probabilistic fracture mechanics,fatigue reliability,probabilistic remaining fatigue life,inspection intervals |
| 基金项目:中国科学院资助项目;清华大学-中大集团联合资助项目;长安大学校科研和教改项目 |
| 王春生 陈艾荣 聂建国 陈惟珍 |
| [1]长安大学桥梁与隧道陕西省重点实验室,西安710064 [2]清华大学土木工程系,北京100084 [3]同济大学桥梁工程系,上海200092 |
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| 中文摘要: |
| 中国铁路线上大量既有钢桥承受着日益繁重的交通荷载，其疲劳剩余寿命与使用安全已受到桥梁管理部门的高度重视，为避免不必要的维护与更换，应建立合理的既有钢桥使用安全评估方法。在建立能反映铆接钢桥疲劳破坏机理的脆断和韧断概率失效模型基础上，给出了疲劳可靠性分析的极限状态方程，并合理确定了随机变量的参数取值。建立了铆接钢桥构件双角钢概率疲劳破坏模型，基于Monte Carlo算法实现了铆接钢桥构件双角钢疲劳断裂失效概率的计算，编制了相应的概率断裂分析程序DAPFF。进而将概率断裂力学评估方法应用于京九线赣江桥的时变疲劳可靠度分析，并给出了赣江桥概率疲劳剩余寿命评估结果与维护对策。 |
| 英文摘要: |
| 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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