Summarizing the literatures available and analyzing in situ experimental data, and based on the principle of interaction between beam and rail and the compatibility of deformation and boundary, the paper puts forward a new model for calculating longitudinal forces due to temperature variation in gapless track on continuous beam bridge in urban rail transit.

The calculating formula of shrinkage and tension stress of the pavement is set up on the basis of the friction between slab and base.

That was found after studying the interaction behavior between the railway bridge and CWR and the distribution rule of additional contractility.

Compare d with the conventional method, LM can overcome the accumulative errors,s o in the calculating of the additional contractility of BCWR (bridge continous w elded rail),LM method can be used on multi-span bridges, especially .

Based on the proper assumptions and approximations, the coupling mechanism of the electromagnetic acoustic transducer (EMAT) for ultrasonic generation within ferromagnetic material has been studied by analyzing the eddy current distribution, Lorentz force, magnetostriction force and magnetization force.