Train Elevated Guideway Interactions

摘要

The report describes a computer program modeling the response of an elevated guideway to the passing of a high-speed train. The train is modeled by a lumped parameter dynamic system. Specifically, the model consists of a two-vehicle train, traveling at constant velocity, over a series of similar, simply-supported bridges which may have initial camber. The response of the bridge is represented as the sum of normal mode responses. These are coupled to the equations of motion governing the response of the vehicles. The resultant system of equations is numerically integrated from arbitrary initial conditions. For evenly-spaced time intervals, depending on the size of the integration step chosen, the program calculates and prints out the displacement of centers of gravity of the cars, the wheel displacements, and the displacements of the truck masses, as well as the first and second time derivatives of these motion parameters. The output also includes the wheel loads and beam deflections as functions of time. The program has a plotting capability and a restart capability. It also has several options with respect to the modeling of the vehicles. (Author)