既有铆接铁路钢桥剩余寿命的评估  

Assessment of remaining fatigue life for existing riveted railway bridges based on fracture mechanics

作　　者：王春生[1] 陈艾荣[2] 陈惟珍[2] 聂建国[1] 

机构地区：[1]清华大学土木工程系 [2]同济大学桥梁工程系,上海200092

出　　处：《长安大学学报（自然科学版）》2005年第2期55-59,共5页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(50408028);清华大学中大博士后基金项目;长安大学科学基金项目

摘　　要：为确保既有铆接铁路钢桥使用安全,探讨了评估既有铆接铁路钢桥疲劳剩余寿命的方法。以京九线赣江桥为例,介绍了基于断裂力学的既有铆接铁路钢桥剩余寿命评估的原理与方法。基于断裂力学的评估过程主要包括如下4个步骤:识别临界构件、计算临界裂纹尺寸、疲劳裂纹扩展模拟、确定探测间隔。根据赣江桥剩余寿命评估结果:若按保证桥梁的正常使用功能,超声波探测间隔为1 a;若按保证主桁结构承载安全,则探测间隔为3 a。In China the existing riveted railway bridges are often required to carry an increasing volume of traffic, usually consisting of trains heavier than those considered in the original design. 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. Through the example of Ganjiang Bridge on Jing-jiu railway line, the fracture mechanics model applied to evaluate the remaining fatigue life of existing riveted railway bridges is investigated. The general procedure to determine the remaining fatigue life of existing riveted railway bridges can be divided into the following four steps: identification of the vital elements to be analyzed from bridge system, calculation of the critical crack size, simulation of crack growth from the initial crack size to the critical crack size, determination of economical and safe inspection intervals. According to the remaining fatigue life assessment results of Ganjiang Bridge, the inspection intervals for assuring the normal service function is only one year, and the inspection intervals for assuring the load-carrying capacity of main truss is three years.

关 键 词：桥梁工程 既有铆接铁路钢桥 疲劳剩余寿命 断裂力学 探测间隔 评估 

分 类 号：U445.7[建筑科学—桥梁与隧道工程]