Abstract
Due to the temperature change of bridges, there is a great additional force in continuously welded rails on continuous bridges. Laying rail expansion regulators is an effective measure to reduce the additional force. The nonlinear finite element model is presented for a continuously welded rail track with a rail expansion regulator resting on the embankment and simple and continuous beams, considering the temperature change of the bridge. Then, a method is proposed to determine the locations of the rail expansion regulator and the fixed bearing of the continuous beam, corresponding to the maximum additional forces of rail reaching minimum values. Their appropriate matching locations are recommended based on the obtained influence laws of any locations of the rail expansion regulator and the fixed bearing of the continuous beam on the maximum additional forces of rail. The results can provide the theoretical basis for the design of the rail expansion regulator and the fixed bearing of long-span continuous bridges.
Highlights
Welded rails (CWRs) have been widely used because of their low maintenance cost and good smoothness
It is and assumed that the simple and continuous beams are not influenced by the rails during the temperature change of the beams the beam, respectively, uD represents the displacement difference between uR and uB, and u and that they move freely
That the simple and continuous beams are not influenced by the rails during the temperature change u = α · ∆T · x of the beams and that they can move freely.B TheBvalue ofB uB of the simple and continuous beams where αB represents the coefficient of thermal extension of the beam, ∆T represents the temperature can be written as
Summary
Welded rails (CWRs) have been widely used because of their low maintenance cost and good smoothness. Yan et al [18] found that installing RER at the end of the bridge can effectively reduce the additional the longitudinal nonlinear stiffness characteristics and studied the influence of some factors on the expansion force of rail. Discussed the influence of a of the support of a long-span steel bridge on the additional expansion force of rail.supported beam-support arrangement on the longitudinal force.beam-support. Particular, the on matching of the RER location and location of the continuous bridge has aIn significant effect the maximum additional force of the rail.fixed. To the support location of the continuous bridge has a significant effect on the maximum additional force of authors’ knowledge, research on the appropriate matching locations of the rail expansion regulator and rail.
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