Probabilistic Fatigue Life Estimation of Steel Bridges by Using a Bilinear S-N Approa - Printable Version +- Civil Engineering Association (https://forum.civilea.com) +-- Forum: eBooks (https://forum.civilea.com/forum-63.html) +--- Forum: Journals, Papers and Presentations (https://forum.civilea.com/forum-74.html) +--- Thread: Probabilistic Fatigue Life Estimation of Steel Bridges by Using a Bilinear S-N Approa (/thread-42211.html) |
Probabilistic Fatigue Life Estimation of Steel Bridges by Using a Bilinear S-N Approa - asim99 - 03-18-2013 Probabilistic Fatigue Life Estimation of Steel Bridges by Using a Bilinear S-N Approach Author: Kihyon Kwon, Dan M. Frangopol and Mohamed Soliman | Size: 1.4 MB | Format: PDF | Quality: Unspecified | Publisher: ASCE | Year: 2012 | pages: 13
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. Code: *************************************** |