Numerical analysis of long-haul structure laying on nonlinear foundation subjected to moving load

Abstract

The article deals with a long structure laying on nonlinear foundation subjected to moving load. Such problems often arise due to design of an upper-track structure in railroad engineering, specifically due to design of floating slab track structures in tunnels. The design procedure aims at calculating static and dynamic parameters of a floating slab track structure, that consist of reinforced concrete track slab and a number of nonlinear-elastic elastomeric pads, that supports the track slab. In order to get detailed analysis of the floating slab track structure, the analysis is performed using FE-model in MSC Patran/Nastran software package. FE-model includes rails, railway fastenings, track slab, elastomeric pads and supports. The results of the static analysis are the deflections of the upper-track structure and stress-strain state of the floating slab. The results of the dynamic analysis include transfer-function of the floating slab and evaluation of insertion loss under excitation frequencies of moving trains over different speed.