Abstract
Bridges are vulnerable to the fatigue damage accumulation caused by traffic loading over the service period. A continuous growth in both the vehicle weight and the traffic volume may cause a safety hazard to existing bridges. This study presented a computational framework for probabilistic modeling of the fatigue damage accumulation of short to medium span bridges under actual traffic loading. Stochastic truck-load models were simulated based on site-specific weigh-in-motion measurements. A response surface method was utilized to substitute the time-consuming finite element model for an efficient computation. A case study of a simply supported bridge demonstrated the effectiveness of the computational framework. Numerical results show that the simulated fatigue stress spectrum captures the probability density functions of the heavy traffic loading. The equivalent fatigue stress range increases mostly linearly in the good road roughness condition with the growth of the gross vehicle weight. The vehicle type and the road roughness condition affect the stress range. The influence of the driving speed on the equivalent stress range is non-monotonic. The bridge fatigue reliability has a considerable increase even under a relatively high overload limit. It is anticipated that the proposed computational framework can be applied for more types of bridges.
Highlights
With the steady growth of the global economy and the intense competition of the transportation market, the traffic loading on highway bridges has increased over the last decades.[1,2] Such continuous increase in the traffic loading may pose a safety threat to the existing bridges
This study aims to present a computational framework for fatigue reliability evaluation of short to medium span bridges under stochastic truck loading
This study presented a method for evaluating fatigue reliability of short to medium span bridges based on site-specific stochastic traffic loading
Summary
With the steady growth of the global economy and the intense competition of the transportation market, the traffic loading on highway bridges has increased over the last decades.[1,2] Such continuous increase in the traffic loading may pose a safety threat to the existing bridges. Several bridges were collapsed due to couples of overloaded trucks.[3,4] Fatigue damage induced by heavy trucks is one of these failure mechanisms as summarized by Deng et al.[5] leading to the collapse of in-service bridges. For the short to medium span bridges, the applications of the high strength materials, the design theory that makes full use of strength of materials in high stress condition, and the decreasing dead-to-live-load ratio make them fatigue-sensitive to vehicle loads.[6] the trafficload-induced fatigue damage accumulation of short to medium span bridge deserves investigation
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