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Abstract
To estimate the fatigue life of long-span steel bridge more accurately, this paper proposes a method for estimating the fatigue life of long-span bridges by considering vehicle-bridge coupled vibration. Firstly, the universal equation of vehicle-bridge vibration is derived based on triaxial standard multi-scale model of fatigue vehicle and bridge, and relevant program for vehicle-bridge coupled vibration is programmed. Secondly, a method for estimating the fatigue life of long-span steel bridge is proposed based on fracture mechanics theories, and the analysis process is expounded in details. Finally, the method for estimating fatigue life proposed in this paper is verified by taking a double pylon cablestayed bridge with orthotropic steel bridge deck slab as an example.
Highlights
To cater to people’s travel demand, there are more and more long-span bridges appearing everywhere in the world
The fatigue life of the structure often consists of emerging stage and propagation stage of the fatigue crack, where crack emerging stage includes the occurrence of tiny cracks and propagation in small range; propagation stage includes stable propagation of the crack and unstable fracture
946 The Open Mechanical Engineering Journal, 2015, Volume 9 life of engineering structure and components is mainly determined by the stable propagation stage of cracks, generally, the initial length of the fatigue cracks of the components are set according to test and empirical values when estimating fatigue life
Summary
To cater to people’s travel demand, there are more and more long-span bridges appearing everywhere in the world. For long-span bridges, the impact effect of vehicles on the fatigue and sensitive parts of the bridges cannot be ignored. To learn the stress characteristics of long-span steel bridges more accurately for guiding the anti-fatigue design of bridges, this paper plans to analyze vehicle-bridge coupled vibration of long-span bridge under multi-scale model, precisely considering the impact effect of vehicles’ on the fatigue detail parts. The researchers estimate the fatigue life of the bridge by means of fracture mechanics methods, and analyze the influences of various factors on the fatigue life of the bridge They take a cable-stayed bridge with orthotropic steel bridge deck slab as an example to verify the proposed method for estimating the fatigue life of long-span bridges by considering the impact effect of vehicle-bridge coupled vibration
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