Dynamic Analysis and Experimental Research on Jointless Turnout on Bridge of High-Speed Railway

Aiming at dynamic interaction of vehicle, turnout and bridge in high-speed railway, it put the vehicle, turnout and bridge as a coupling system. Grounded on the vehicle dynamics, turnout dynamics and the FEM of bridge dynamic analysis, linked by the relations of wheel-rail and turnout-bridge, it established a dynamic model and its analysis theory of jointless turnout on bridge, and applied the numerical simulation method to study the dynamic characteristics of turnout and bridge structure, as well as safety and comfort of the high-speed running conditions. Integrative dynamic performance tests of jointless turnout both on bridge and on subgrade were carried out at Zhejiang-Jiangxi railway line when respectively run 200 km/h EMUs, 160 km/h passenger train and 120 km/h freight train, by contrasting the dynamic performance of turnout both on bridge and subgrade and comparing the measured results and theoretical calculations of jointless turnout on bridge, it verified the scientific significance of dynamic analysis theory of turnout on bridge.