随机车载下钢箱梁桥疲劳损伤概率模型

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摘要 Fatigue truck models with deterministic parameters were developed int a stochastic vehicle flow model. A response surface method was used to approximate the function between vehicle axle weight and equivalent fatigue stresses with few training data to solve the time-consuming problem of bridge finite element analysis under traffic flow loads. A probabilistic fatigue damage modeling method was presented and applied to the rib-to-deck details of steel box girder bridges. Finally, the fatigue damage model was applied to the reliability assessment of steel box girder bridges, and influences of traffic flow parameters on structural fatigue reliability were studied. Numerical results indicate that the higher occupancy rate of heavy vehicle flow in a slow lane than in a fast lane mainly explains the decrease in the fatigue reliability of corresponding rib-to-deck details. The increase in vehicle axle weight causes a rapid decrease in the fatigue reliability index of steel box girders. The fatigue reliability index of rib-to-deck detail in the slow lane decreases from 3.42 to 0.72 when the annual linear growth factor ranges from 0 to 1%. The stochastic fatigue vehicle flow model and the probabilistic model for fatigue damage exhibit considerable potential in the probability assessment of bridge fatigue damage.

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	罗媛
	颜东煌
	袁明
	鲁乃唯

关键词 ： bridge engineering, fatigue reliability, response surface, steel box girder, stochastic traffic flow, rib-to-deck

Abstract：Fatigue truck models with deterministic parameters were developed int a stochastic vehicle flow model. A response surface method was used to approximate the function between vehicle axle weight and equivalent fatigue stresses with few training data to solve the time-consuming problem of bridge finite element analysis under traffic flow loads. A probabilistic fatigue damage modeling method was presented and applied to the rib-to-deck details of steel box girder bridges. Finally, the fatigue damage model was applied to the reliability assessment of steel box girder bridges, and influences of traffic flow parameters on structural fatigue reliability were studied. Numerical results indicate that the higher occupancy rate of heavy vehicle flow in a slow lane than in a fast lane mainly explains the decrease in the fatigue reliability of corresponding rib-to-deck details. The increase in vehicle axle weight causes a rapid decrease in the fatigue reliability index of steel box girders. The fatigue reliability index of rib-to-deck detail in the slow lane decreases from 3.42 to 0.72 when the annual linear growth factor ranges from 0 to 1%. The stochastic fatigue vehicle flow model and the probabilistic model for fatigue damage exhibit considerable potential in the probability assessment of bridge fatigue damage.

Key words： bridge engineering fatigue reliability response surface steel box girder stochastic traffic flow rib-to-deck

收稿日期: 2017-06-25

基金资助:Supported by the National Basic Research Program (973 program) of China (No.2015CB057705); the National Natural Science Foundation of China (No.51108046) and the Natural Science Foundation of Hunan Province (No.13JJ6049).

通讯作者: LUO Yuan E-mail: 1528958871@qq.com

引用本文:

罗媛, 颜东煌, 袁明, 鲁乃唯. 随机车载下钢箱梁桥疲劳损伤概率模型[J]. Journal of Highway and Transportation Research and Development, 2017, 11(3): 62-70.
LUO Yuan, YAN Dong-huang, YUAN Ming, LU Nai-wei. Probabilistic Modeling of Fatigue Damage in Orthotropic Steel Bridge Decks under Stochastic Traffic Loadings. Journal of Highway and Transportation Research and Development, 2017, 11(3): 62-70.

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