طاها بحري دورباش

This thesis investigates damage detection in a two-dimensional dynamic interaction system of a train, track, and bridge using numerical methods. The research explores the effect of increasing the speed and mass of passing train wagons on the dynamic response of system components. Three types of damage, including bridge damage, damage to bridge supports, and damage to the rail-to-tie connection, are simulated and examined. The impact of each damage’s intensity on its detectability is assessed through an analysis of the dynamic response of the front bogie’s acceleration. Key frequencies influencing the system’s excitation forces are identified, and the effects of stiffness variations in the rail supports along the track and the spacing between the axles are analyzed concerning these frequencies. Additionally, the feasibility of damage detection using the drive-by method and the influence of damage intensity on this approach are eva‎luated. A case study is conducted in which the front bogie’s and wagon’s acceleration responses and the displacement of the mid-span of the bridge in healthy and damaged conditions are compared. The contributions of this research include presenting a method for identifying various types of damage in railway tracks and bridges by utilizing the key frequencies of the train-track-bridge dynamic interaction system. The aim of this study is to provide innovative methods for damage detection and accurate system response analysis, contributing to improving the safety and efficiency of bridges and tracks in railway systems.

آسيب پل ريلي , آسيب تكيه‌گاه پل , آسيب مسير ريلي

Railway Bridge Damage , Bridge Support Damage , Rail Track Damage

Taha Bahri

Mohammad Ali Rezvani