Analysis of the influence of Chinese and foreign standard vehicle loads on the fatigue effect of orthotropic steel bridge decks

摘要

In view of the influence of Chinese and foreign standard vehicle loads on the fatigue effect of orthotropic steel bridge decks, the Chinese steel bridge specification JTG D64-2015 fatigue vehicle model III is selected and compared with Eurocode, BS5400 and AASHTO vehicle models. Ansys was used to establish a refined finite element model. Based on the analysis of fatigue stress influence surface, the effects of wheel load distribution, pavement diffusion, fatigue vehicle type and wheel track on fatigue effect were analysed, and the sensitivity of fatigue effect on different vehicle load parameters was discussed. The results show that the aspect ratio of wheel load has a significant influence on the fatigue stress influence surface. Besides, JTG D64 should introduce the wheel load distribution regulations according to the classification of vehicle. The pavement diffusion effect reference BS5400 adopts the 26.5° angular diffusion model. It was found that the orthotropic steel bridge deck designed according to AASHTO can no longer meet the current load requirements in China. The results obtained by fatigue design and evaluation according to JTG D64 vehicle model III are more accurate. The lateral probability distribution of the vehicle in JTG D64 is suitable for anti-fatigue design. Moreover, in the fatigue evaluation, the influence of the wheel track distribution on the fatigue details around the load should not be neglected.