作者机构：
[颜东煌; 王晟; 潘权] Hunan Province University Key Laboratory of Bridge Engineering, Changsha University of Science &, Technology, Changsha, Hunan, 410114, China;[母进伟] Guizhou Highway Engineering Group Co. Ltd., Guiyang, Guizhou, 550008, China;[颜东煌; 王晟; 潘权] School of Civil Engineering and Architecture, Changsha University of Science &, Technology, Changsha, Hunan, 410114, China
期刊：
International Journal of Reliability and Safety,2016年10(4):389-404 ISSN：1479-389X
通讯作者：
Luo, Yuan(luoyuanbridge@163.com)
作者机构：
[Yan, Donghuang; Yuan, Ming; Luo, Yuan] School of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha, 410114, China
通讯机构：
School of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha, China
摘要：
A realistic traffic simulation is a premise of the fatigue damage estimation. This study presents a novel computational framework for probabilistic modelling of fatigue damage accumulation in steel bridge decks under stochastic traffic load. The stochastic traffic load is simulated based on bridge weigh-in-motion measurements, and the dynamic effects are solved in a vehicle-bridge coupled vibration system. A response surface method is utilised to replace the finite-element analysis. Probability models of the fatigue stress ranges are finally used for fatigue reliability evaluation of an orthotropic steel bridge deck. Numerical results show that the stress spectrum under the actual traffic loads follows a bimodal distribution. Both the fatigue reliability index and the fatigue life decrease rapidly under a continuous traffic growth. A strict threshold overload ratio reduces the decreasing range of the reliability index caused by traffic growth.
会议论文集名称：
The 14th International Symposium on Structural Engineering(第14届结构工程国际研讨会)论文集
关键词：
concrete box girder;vehicle load spectrum;equivalent principal tensile stress amplitude;fatigue life
摘要：
Under the bending-shear condition, the diagonal crack of web will appear in concrete box-girder bridge when principal tensile stress of tensile-shear zone concrete exceeds principal stress limit value. The overall objective of this study is to develop a calculated method for the fatigue behavior of web under bending-shear of concrete box-girder bridge. First, some basic conceptions and calculation methods of concrete fatigue theory are introduced. Next, the time-history curves of bending moment, shear force and principal tensile stress in typical section have been achieved. Then the effects of vehicle speed and heavy vehicles for the equivalent principal tensile stress on web of box-girder are discussed. Finally, the reliability index is established to assess the fatigue life for existing concrete box-girder bridge. Some conclusions are drawn on the basis of the current research.
作者机构：
[董道福] Hunan Province University Key Laboratory of Bridge Engineering, Changsha Univ of Science &, Technology, Changsha, Hunan, 410114, China;[董道福; 袁明; 颜东煌; 涂光亚; 陈常松] School of Civil Engineering and Architecture, Changsha Univ of Science &, Technology, Changsha, Hunan, 410114, China
通讯机构：
School of Civil Engineering and Architecture, Changsha Univ of Science & Technology, Changsha, Hunan, China
