铆接钢桥剩余寿命与使用安全评估  

Assessment of Remaining Fatigue Life and Service Safety for Riveted Steel Bridges (Abstract of the Ph.D. Thesis)

作　　者：王春生[1] 陈艾荣[2] 陈惟珍[2] 

机构地区：[1]长安大学桥梁与隧道陕西省重点实验室 [2]同济大学桥梁工程系

出　　处：《中国铁道科学》2004年第3期138-140,共3页China Railway Science

摘　　要：A comprehensive approach to evaluate the remaining fatigue life and service safety of existing riveted steel bridges is developed in the dissertation, in which the effects of the fatigue failure evolution mechanism, multi-failure modes of riveted structure, fatigue failure characteristics of riveted multi-elements, riveted build-up multi-members of riveted steel bridges, etc. are included. A system based on the theory of fatigue accumulation damage, fracture mechanics and theory of reliability is established to assess the service safety of riveted steel bridges. The following aspects are investigated in this paper:(1)For the present problem of no adequate traffic load spectrum simulation specifications in Chinese highway and railway bridge design codes, the stress spectrum is measured at site based on the investigation of the statistic traffic data of highway and railway bridges and through the simulation of traffic load with Monte-Carlo method. Analysis is made by comparing field measurement of the stress spectrum with the calculated one of Zhejiang Road Bridge in Shanghai and Ganjiang Bridge of Jingjiu Railway. The result of stress spectrum comparison shows that the simulated traffic load spectrum established in this paper can be used to evaluate the remaining fatigue life.(2)According to the analysis of full-scale fatigue experiments in references, the S-N curve of AASHTO Category D is adopted. Based on investigation of the appropriate fatigue strength category for a riveted bridge member, linear fatigue-damage accumulation analysis approach, commonly known as Miner’s rule, is applied to calculate the fatigue life of riveted bridge members, thus determining a list of inspection priority for riveted members.(3)A fracture mechanics method to evaluate the remaining fatigue life and service safety of riveted steel bridges is proposed in the dissertation. According to the fatigue failure characteristics of riveted member, two simplified fracture mechanics models (SFMM) -CCT and DECT are developed. Due to the defiA comprehensive approach to evaluate the remaining fatigue life and service safety of existing riveted steel bridges is developed in the dissertation, in which the effects of the fatigue failure evolution mechanism, multi-failure modes of riveted structure, fatigue failure characteristics of riveted multi-elements, riveted build-up multi-members of riveted steel bridges, etc. are included. A system based on the theory of fatigue accumulation damage, fracture mechanics and theory of reliability is established to assess the service safety of riveted steel bridges. The following aspects are investigated in this paper:(1)For the present problem of no adequate traffic load spectrum simulation specifications in Chinese highway and railway bridge design codes, the stress spectrum is measured at site based on the investigation of the statistic traffic data of highway and railway bridges and through the simulation of traffic load with Monte-Carlo method. Analysis is made by comparing field measurement of the stress spectrum with the calculated one of Zhejiang Road Bridge in Shanghai and Ganjiang Bridge of Jingjiu Railway. The result of stress spectrum comparison shows that the simulated traffic load spectrum established in this paper can be used to evaluate the remaining fatigue life.(2)According to the analysis of full-scale fatigue experiments in references, the S-N curve of AASHTO Category D is adopted. Based on investigation of the appropriate fatigue strength category for a riveted bridge member, linear fatigue-damage accumulation analysis approach, commonly known as Miner's rule, is applied to calculate the fatigue life of riveted bridge members, thus determining a list of inspection priority for riveted members.(3)A fracture mechanics method to evaluate the remaining fatigue life and service safety of riveted steel bridges is proposed in the dissertation. According to the fatigue failure characteristics of riveted member, two simplified fracture mechanics models (SFMM) -CCT and DECT are developed. Due to the defici

关 键 词：铆接钢桥 疲劳与断裂 荷载谱模拟 剩余寿命 概率断裂模型 系统疲劳可靠度 MONTE-CARLO模拟 检测间隔 

分 类 号：U4466[建筑科学—桥梁与隧道工程]