Topic
Vibration fatigue
About: Vibration fatigue is a research topic. Over the lifetime, 3460 publications have been published within this topic receiving 46297 citations.
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TL;DR: In this article, the authors present a comprehensive framework for fatigue reliability analysis of long-span bridges under combined dynamic loads from vehicles and wind, and the probability of failure for the fatigue damage at the end of each block of stress cycles and the cumulative probability for failure can be obtained.
Abstract: During a bridge’s life cycle, the stresses from multiple dynamic loads might be superposed and progressive fatigue damage might accumulate and induce serious fatigue damage issues. This paper presents a comprehensive framework for fatigue reliability analysis of long-span bridges under combined dynamic loads from vehicles and wind. After modeling the complicated structure details with equivalent orthotropic material, dynamic stress ranges of a long-span bridge are obtained via solving the equations of motion for the vehicle-bridge-wind dynamic system with multiple random variables considered, for instance, vehicle speed, road roughness conditions, and wind velocity and direction. After counting the number of stress cycles at different stress range levels using the rain flow counting method, fatigue damage increments are obtained using the fatigue damage accumulation rule. The probability of failure for the fatigue damage at the end of each block of stress cycles and the cumulative probability of failure can be obtained. As a result, the fatigue life and reliability for the given structure details can be obtained. Based on the results from a case study, the dynamic effects from vehicles are found to be relatively small for long-span bridges and the effects from vehicle speeds and road roughness conditions can be neglected. Nevertheless, even though the stresses from either the vehicle loads or wind loads may not be able to induce serious fatigue problems alone, the superposed dynamic stress ranges cannot be ignored for fatigue reliability assessment of long-span bridges.
43 citations
TL;DR: In this paper, a novel energy-based method is developed that takes advantage of the shakedown theory and multiscale concept to evaluate the S-N curve of fatigue resistance.
43 citations
TL;DR: In this paper, a multilayer perceptron is used to model the Weibull or lognormal conditional probability density function, which is modelled with a multi-layer perceptron for service life prediction of a structural component.
43 citations
TL;DR: In this paper, the authors presented a set of measured full-scale wave-induced stress ranges in a container ship, where the associated fatigue damage rates calculated from a combination of the rain-flow counting method and the Palmgren-Miner damage rule were compared with damage predictions obtained from a computationally much faster frequency fatigue analysis using a spectral method.
43 citations
TL;DR: In this article, a frequency-domain critical-plane criterion is reformulated in order to improve its accuracy in terms of fatigue life estimation for smooth metallic structural components under multiaxial random loading.
43 citations