Einfluss der Boden-Bauwerk-Interaktion auf die dynamische Charakteristik von Eisenbahnrahmenbrücken = Influence of soil-structure interaction on the dynamic characteristics of railroad frame bridges

Railroad frame bridges experience intensive dynamic stresses. Due to the massive component dimensions and the strong degrees of restraint, the dynamic system is often not clearly identifiable. In this paper, the governing factors of soil-structure interaction on the dynamic behavior of the bedded frame are identified. The vertical abutment frequency is shown to be the governing parameter for the vibrating system. In the investigations, different modeling approaches are compared. It was shown that under certain conditions, the variant of a spatial mono-frequency de-pendent substructure model provides similarly accurate results as determined by a computationally intensive hybrid FEM-BEM approach.