Vehicle-bridge interaction analysis of heavy load railway

An inter-system iteration solution for the vehicle-bridge coupling model is studied, in which the iteration within time step is avoided. The solution consists of two steps. At the first step, the bridge subsystem is assumed rigid, the vehicle motion and wheel-rail force are solved by the independent vehicle subsystem, and the bridge motion is obtained by putting the wheel-rail force to the independent bridge subsystem. At the second step, the vehicle motion and the wheel-rail force are modified by the calculated bridge motion. As a case, the calculation process and the results of 30t heavy load cargo train traversing a 70+3×120+70 m continuous frame bridge are studied, and the numerical calculation technology for solving the interacted system and its convergence characteristics is discussed.