The influence of construction residual stress and sextuple-line train load on the high-speed railway frame structure

Abstract

To improve traffic capacity of high-speed railway station, the sextuple-line railway frame structure without pre-stress is proposed for high-speed railway station yard. To analyze the mechanical characteristics of the frame structure, the finite element method and subroutines were adopted. Suitable shrinkage and creep constitutive models were selected and verified. Then, the influence of the train load and construction residual stress were all considered, including frame structure weight, second phase dead load (track weight and ancillary equipment), shrinkage, creep and ZK load. The results show that under the construction residual stress, the maximum tensile stress of the frame structure is found to be 1.59 MPa and is located at the middle-lower part of secondary beams. During operation, the most unfavorable train load combination is 100% double-line ZK train load, with a maximum tensile strength of 1.28 MPa and is located at the middle-lower part of secondary beams. Under the combination of construction residual stress and train load, the maximum tensile strength is located at middle-lower part of secondary beams and exceeds the tensile strength of concrete. Thus, to ensure the safety of the frame structure, more reinforcement needs to be added at middle-lower part of secondary beams.