A Study Of Calculation Method Of CWR On Cable-Stayed Bridge

The bridge-rail interaction theory of CWR (continuous welded rail)on bridge has been developed and improved with the development of CWR technology, and is the important theory basis on paving trans-section CWR. As the railway transportation is developed so rapidly, technical innovation and many new rail-bridge types are arising gradually, which brings unprecedented challenges to the design of continuous welded rail track on bridge. Cable-stayed bridge is becoming one of the available railway-bridges because of its structural characteristics. Especially building high-speed railway in mountainous area requires large bridge-span and good ride comfort, which can be satisfied by cable-stayed brige. So it has important practical significance to research on CWR on cable-stayed bridge.A finite element model of the truss steel cable-stayed bridge with"5 x 32m simple beam +(36+96+228+96+36) m steel truss beam+5×32m simple beam" is set up in this paper. Bridge-rail interaction and longitudinal force-bearing mechanism of cable-stayed bridge are deeply studied with the guidness of bridge-rail interaction theory, calculation theory of CWR on bridges and finite element method; Influences of cable stay and main tower on the value and distribution regularity of longitudinal additional force of CWR on bridges are studed; Influences of the layout of braking damper fixed on semi-floating bridges on distribution regularity of longitudinal additional force are studed. Results show that distribution regularity of longitudinal additional force of CWR on cable-stayed bridges is the same as that on common bridges, and paving CWR on this type of bridge is feasible; The cable stay and main tower can limit longitudinal displacement of truss steel beam. The bigger stiffness of them is, the smaller longitudinal additional force is. But as long as the stiffness of cable stay and main tower can satisfy the construction design of bridges, the changes of stiffness have few influences on bridge-rail interaction. So the influences of stiffness changes of them need not be considered when the CWR on bridge is designed; The increasing of cable stay's temperature can increase the additional expansion and contraction forces on rails, but the increasing of main tower's can decrease it, which shows that the influences of temperature' changing should be taken into account when CWR on cable-stayed bridge is designed; By using the braking damper, the braking force and the bridge-rail relative displacement are both decreased, and the expansion regulator need not be used.Based on the results above, the CWR design of this bridge model is completed and the simplified algorithm of CWR design on this kind of bridge is set up, which provides reference for calculation of this kind of bridge and beneficially supplements the theory and code of CWR on this kind of bridge.