The combinatorial coefficient method of fatigue stress calculations for open-ribbed orthotropic anisotropic steel bridge panels of urban rail transit steel box girders
To simplify the evaluation of fatigue in urban rail transit steel box girders with open-ribbed orthotropic steel decks(OSDs),a fatigue stress calculation combinatorial coefficient method is proposed using finite element analysis.Firstly,the finite element model of the Chongqing Jiahua rail transit bridge was utilized to determine the longitudinal and lateral extent of the influence zone for vehicle fatigue loading,along with identifying the position of maximum load intensity.The influence of the damping pad and the longitudinal stringer stiffness,along with the rail sleeper form on the fatigue stress of open-ribbed OSDs was also investigated.Subsequently,based on the realities of projects,the benchmark structure of orthotropic anisotropic steel bridge panels for urban rail transit bridges and the range of variation of each design parameter were determined.Then,by using the above finite element analysis,a parameter analysis was performed according to the ranges of deck thicknesses,rib thicknesses,and spacings,as well as transverse rib thicknesses,spacings,heights,and cutout radiuses.The influence coefficients of these parameters were determined and a combinatorial coefficient method of fatigue stress calculation for open-ribbed OSDs under rail transit loads was proposed.Finally,the rationality and reliability of the method were verified through numerical examples,with calculation errors within 10%,providing a reference for fatigue design.
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