Application of new damage indicator-based sequential law for remaining fatigue life estimation of railway bridges

Grain-scale plasticity based fatigue model to estimate fatigue life of bridge connections

“…One of the critical connections which was found from a detailed investigation of one of the longest railway bridges in Sri Lanka [7,8] is selected for the life estimation. The selected riveted connection is shown in Fig.…”

“…The residual tensile force in the rivets occurs when the rivet gets shortened in length due to cooling after a hot rivet is inserted into the hole of plates in order to connect them, and a second head is formed from the protruding shank. Finally the clamping force generates a triaxial stress state in the connected plate [7,8]. Since this study assumes that all riveted locations have no clamping force (value of the clamping force is zero), the connected members are subjected only to the biaxial stress state [16].…”

“…In the case of high cycle fatigue, the equivalent effective stress with Miner's rule is the most popular multiaxial fatigue criterion in the service life estimation of railway bridges [1,4,5]. However under many variable amplitude loading conditions, Miner's predictions have been found to be unreliable since it does not properly take into account the loading sequence effect [5][6][7][8]. Recently, a number of damage models have been proposed to capture the loading sequence effect of variable amplitude loads more precisely.…”

“…Among these, the sequential law [6] associated material parameter determination procedure became an easy task since those are determined using the available S-N curve of the material. As a result, a sequential law associated method has been modified to apply for railway bridges [7,8]. However, previous studies by the authors have showed that even though effective stress with sequential law produces better results in multiaxial fatigue than Miner's rule; still these results exhibits much deviation from real fatigue life.…”

Improving Fatigue Evaluations of Structures Using In-Service Behavior Measurement Data

“…Several studies have validated and calibrated behavior models by comparing analytical results with field measurements in order to make fatigue assessments at other critical locations of the structure (Siriwardane et al 2008;Liu et al 2010;Guo et al 2012;Uzgider et al 1996). Generally, such assessments do not explicitly account for model and measurement uncertainties.…”