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Title:: Corrosion fatigue crack propagation life of joints of railway steel bridge

Author(s):: LIU Jia; JI Zeliang; QU Weilian; LU Jiaxing

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Abstract:: In order to evaluate the residual fatigue life of the serviced railway steel bridge after the occurrence of initial crack due to the environmental corrosion, the corrosion fatigue crack propagation life of crossbeam region on joints of steel railway bridge after the existence of corrosion fatigue crack in the environmental corrosion was studied under the train running load in this paper. Taking the Poyang Lake Railway Steel Bridge on Tongjiu (Tongling to Jiujiang) Line as a research background, the integral shell element model of steel railway bridge and the finely meshed solid model of joints with initial crack were established by using general finite element software based on the multiscale modeling method of the submodel method. The precise dynamic stress response of the joints of steel railway bridge was obtained under the train running load. The corrosion fatigue crack propagation life of steel railway bridge with four different initial crack lengths were evaluated and compared based on the four parameters Forman formula, and the crack propagation life with or without environmental corrosion of railway steel bridge was analyzed and compared. The results show that the shellsolid multiscale modeling method based on the submodel method can not only meet the computational efficiency of the largescale complex structure in the numerical calculation process, but also meet the requirements of precise dynamic response required for the calculation of fatigue life, and it can accurately evaluate corrosion fatigue crack propagation life of railway steel bridge. The corrosion fatigue crack propagation life of railway steel bridge is mainly produced in the small crack propagation stage, a 0.5 mm initial crack enlarging to 10 mm needs cycle 484 509 times, it account for 50.2% of the total propagation life. The fatigue crack propagation life of railway steel bridge is largely affected by environmental corrosion, and it is reduced by 79% compared with the fatigue crack propagation life without corrosion. The research results can provide a reference for predicting the development trend of fatigue crack, assessing the residual life of railway steel bridge and assessing the safety and operational capacity of the structure. 1 tab, 11 figs, 25 refs.

Corrosion fatigue crack propagation life of joints of railway steel bridge(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

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