Fatigue Stress Analysis of Steel-Concrete Composite Beam Under Vehicle Load
[Purposes]With the extension of bridge service life and the increase of vehicle load,the bear-ing capacity of the structure will become weaker and weaker,and the fatigue life will continue to de-crease,which may eventually lead to low stress fatigue failure.Therefore,it is necessary to study the fa-tigue detail stress of steel-concrete composite beam of arch bridge under vehicle load.[Methods]A three-dimensional solid finite element model of three standard lengths was established by using Midas FEA NX software through numerical simulation method.The location of the key points of vulnerable fa-tigue of steel-concrete composite beams was analyzed,and the variation law of fatigue detail stress under the most unfavorable lateral loading position and longitudinal loading of vehicle load was studied.[Find-ings]The results show that there are three fatigue key points at the intersection of the upper transverse beam and the middle longitudinal beam of the composite beam.The position near the midline of the bridge is the most unfavorable transverse loading position for the fatigue of the steel beam under vehicle load.When four different standards of longitudinal vehicle are loaded,there are two stress peaks at three fatigue key points,and the maximum stress amplitude is lower than the limit value of constant amplitude fatigue strength.[Conclusions]The analysis results can provide reference for the test and related re-search of steel-concrete composite beams.
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