Structural Engineering and Mechanics

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Fatigue reliability assessment of a three-tower four-span suspension bridge under stochastic traffic loads

  • Cheng, Jin (State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University) ;
  • Li, Cheng (Department of Bridge Engineering, Tongji University)
  • Received : 2021.01.27
  • Accepted : 2021.08.30
  • Published : 2021.10.25
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Abstract

This paper aims to study the fatigue performance of three-tower four-span suspension bridges. For this purpose, the Oujiang River North Estuary Bridge which is a three-tower four-span suspension bridge with two main spans of 800m under construction in China is taken as an example in this study. This will be the first three-tower suspension bridge with steel truss girders in the world. This paper uses a random traffic load model to evaluate the fatigue reliability of the orthotropic steel bridge decks of three-tower four-span suspension bridges. In the study traffic load is simulated by random variables, and Monte Carlo simulation method is used to calculate the fatigue reliability index of the steel bridge deck. The parametric analysis is also carried out to clarify the influence of traffic growth rate, target reliability index and axle lateral distribution coefficient. It is found that the growth of traffic volume has the greatest impact on the evaluation results of the fatigue life, and the growth of traffic volume can result in a decrease of fatigue reliability of orthotropic steel bridge decks. The research results can provide a reference for the fatigue life and reliability assessment of three-tower four-span suspension bridge.

Keywords

Acknowledgement

This work presented herein has been supported by the National Key Research and Development Program of China under grant numbers 2018YFC0809600 and 2018YFC0809601, the Ministry of Science and Technology of China under grant number SLDRCE19-B-09. The supports are gratefully acknowledged.

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