Development of Fatigue Check Program of Highway Bridges

公路桥梁疲劳校核程序的开发

• 批准号: 63850102
• 负责人: YAMADA Kentaro
• 金额: $ 0.96万
• 依托单位: Faculty of Engineering, Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63850102/
• 关键词: fatigue; bridge; steel bridge; welded joint; fracture mechanics; service stress; stress measurement; fatigue crack; 道路橋; 疲労照査; 鋼床版; 寿命; 耐久性

Highway bridge are subjected to heavy truck traffics, which causes some fatigue problem to the secondary member of the bridges. Both the member and the weight of the trucks increased , especially during and after the rapid economic growth in Japan in 1960's and 1970's. The highway bridges were traditional not designed for fatigue because the truck loading caused relatively small stress range to the members, compared with the railroad bridges. However, the fatigue cracking were observed recently in many highway bridges, and assessment for fatigue seems necessary.Service stress measurement were carried out on several highway bridges by histogram recorder, and fatigue damages were computed using the Miner's cumulative damage rule. The result revealed that the service stress ranges in main members of the highway bridges were relatively small and a very little chances seemed to exist. However, the service stress ranges in several details which experienced fatigue crackings showed rather high stress ranges, and hence short remaining fatigue lives.

公路桥梁承受着重载交通的作用，对桥梁次构件产生一定的疲劳问题。特别是在日本经济迅速发展的六七十年代，卡车的构件和重量都增加了。公路桥传统上不进行疲劳设计，因为与铁路桥相比，卡车荷载对构件产生的应力范围相对较小。针对近年来公路桥梁出现的疲劳开裂现象，采用直方图记录仪对几座公路桥梁进行了使用应力测试，并采用Miner累积损伤准则计算了桥梁的疲劳损伤。结果表明，公路桥梁主要构件的使用应力幅值较小，存在的可能性很小。然而，在经历疲劳裂纹的几个细节的使用应力范围显示出相当高的应力范围，因此剩余疲劳寿命短。

项目成果

K. Yamada, C. Miki: "Recent Research on Fatigue Damage of Existing Bridges" Journal of Construction Steel Research, Vol.13, 1989, pp.211-222.

K. Yamada、C. Miki：“现有桥梁疲劳损伤的最新研究”《建筑钢研究杂志》，第 13 卷，1989 年，第 211-222 页。

K.Yamada: "Field Measurement of Service Stress and Fatigue Life Evalua fion of Bridge" Proc.of IABSE Colloqnium,Lausanne. (1990)

K.Yamada：“桥梁使用应力和疲劳寿命评估的现场测量”Proc.of IABSE Colloqnium，洛桑。

K. Yamada, H. Shigetomi, S. Utsunomiya: "Fatigue Test Data Base of Steel Structural Element and Allowable S-N Diagram" Proc. of Pacific Structural Conference, 1989.

K. Yamada，H. Shigetomi，S. Utsunomiya：“钢结构元件疲劳试验数据库和许用S-N图”Proc。

K. Yamada: "Field Measurement of Service Stress and Fatigue Life Evaluation of Bridge" Proc. of IABSE Colloquium, Lausanne, 1990.

K. Yamada：“桥梁使用应力现场测量和疲劳寿命评估”Proc。

K.Yamada,S.Nagatu: "Evaluation of Scatter in Fatigue Life of Welded Ditails using Fracture Mechanics" Proc.of JSCE. (1989)

K.Yamada，S.Nagatu：“使用断裂力学评估焊接零件疲劳寿命中的分散”，JSCE 论文集。