eprintid: 1791
rev_number: 12
eprint_status: archive
userid: 5
dir: disk0/00/00/17/91
datestamp: 2016-07-11 12:24:58
lastmod: 2016-07-11 12:51:18
status_changed: 2016-07-11 12:24:58
type: article
metadata_visibility: show
creators_name: Nguyen, Viet Khoa
title: Dynamic analysis of a cracked beam-like bridge subjected to earthquake and moving vehicle
ispublished: pub
subjects: Mechanics
divisions: fac_fema
abstract: This paper presents the influence of a crack on the dynamic behavior of a beam-type bridge subjected to separately or simultaneously a moving vehicle and earthquake excitation. In this study, the bridge is modelled as a 3D beam by the finite element method. The stiffness matrix of a cracked beam element with rectangular section adopted from fracture mechanics is presented. The influences of crack appearance time, crack location, crack depth, and vehicle speed on the dynamic response of the bridge are investigated. When a crack is induced during external excitation the stiffness of the structure is changed leading to a change in natural frequencies during vibration. This change in the frequency is analysed by wavelet spectrum, a time-frequency analysis which can examine locally a signal in both time and frequency domains. The relationship between the crack depth and the instantaneous frequency (IF) of the structure is established which may prove useful for assessment of the crack depth. Numerical simulation results are presented to investigate the efficiency of the method.
date: 2015
date_type: published
id_number: doi: 10.1260/1369-4332.18.1.75
full_text_status: none
publication: Advances in Structural Engineering 2015, Vol 18 (1), p. 75-96
refereed: TRUE
citation:   Nguyen, Viet Khoa  (2015) Dynamic analysis of a cracked beam-like bridge subjected to earthquake and moving vehicle.  Advances in Structural Engineering 2015, Vol 18 (1), p. 75-96 .