Investigation of changes in modal characteristics before and after damage of a railway bridge: a case study

Autor:	George Nikolakopoulos, Niklas Grip, Tarek Edrees Saaed, Jan-Erik Jonasson
Rok vydání:	2015
Předmět:	Damping ratio Damage detection Engineering Frequency response business.industry Mechanical Engineering Computational Mechanics food and beverages Structural engineering Bridge (interpersonal) Modal sense organs Ambient vibration business Civil and Structural Engineering
Zdroj:	The IES Journal Part A: Civil & Structural Engineering. 8:131-144
ISSN:	1937-3279 1937-3260
Popis:	The linear, time-invariant transfer function has been utilised for the construction of frequency response function , based on the ambient vibration measurements. The results presented here indicated the possibility to identify and localise damages in steel railway bridges from the variations in the modal characteristics of the structure. The comparison between the modal characteristics for the healthy and collapsed bridge confirmed that damage had been existed. The abnormal percentage of change in modal damping, between the healthy and any other condition for a structure, can be regarded as a serious indicator for early stages of damage, while the high percentage of change in modal damping can clearly indicate the existence of damage in that structure. The average ratio of change in the damping ratio from the healthy to the collapsed bridge was about 206% and this ratio could be regarded as an index for the existence of a serious damage in steel bridges, which needs further evaluation in other test cases.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::65aea19856a70ed3bb33529b0c48593d https://doi.org/10.1080/19373260.2015.1020889 Zobrazit plný text záznamu