Probabilistic Fatigue Life Estimation of Steel Bridges by Using a Bilinear S-N Approach

作者：Kihyon Kwon, Dan M. Frangopol, Mohamed Soliman · 发表于：Journal of Bridge Engineering · 年份：2012 · DOI：10.1061/(asce)be.1943-5592.0000225 · 被引用次数：56 · 研究领域：Fatigue and fracture mechanics、Structural Health Monitoring Techniques、Concrete Corrosion and Durability

This paper focuses on estimating the fatigue life below the constant amplitude fatigue threshold (CAFT) of steel bridges by using a probabilistic approach on the basis of a bilinear stress life (i.e., the S-N approach). The current AASHTO S-N approach uses a single S-N line for predicting the fatigue life. However, because of the variation of actual applied live-load stress cycles, this approach very often results in a severe underestimation of the useful life of structures. It implies that fatigue damage in respective structural steel details may be overestimated. To improve fatigue life estimation, a bilinear S-N approach is integrated into a probabilistic framework that can model the uncertainties associated with the fatigue deterioration process. In this approach, the equivalent stress range is computed by using two S-N slopes and several probability density functions associated with stress ranges. These probabilistic functions are determined on the basis of stress-range bin histograms from long-term monitoring. An existing bridge that is expected to experience finite fatigue life is used to illustrate the application of the proposed approach.