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Online Fatigue Damage Assessment for Bridges with Structural Health Monitoring System

Li, Z.X., Ko, Jan Ming, & Chan, Tommy H.T. (2000) Online Fatigue Damage Assessment for Bridges with Structural Health Monitoring System. In Ko, J.M. & Xu, Y.L. (Eds.) Journal of Sound and Vibration, Elsevier, Hong Kong, pp. 1053-1060.

Abstract

This paper aims to develop an online assessment approach for evaluating fatigue damage and detection of fatigue critical location or large steel bridges with the long-term structural health monitoring system. The developed approach is on the basis of the real-time data on bridge loading response such as traffic loading, disaster (typhoon, traffic accident, etc) loading data and strain-time histories. Fatigue damage models used in the fatigue crack initiation stage include modified Miner's law and continuous damage model. The fatigue damage assessment by Miner's law provides a preliminary estimation of fatigue damage and consumed portion of service life in terms of the designed value since the fatigue design uses the Miner's law according the present code. For the element with initiated fatigue cracks, a fracture mechanics model is used to evaluate fatigue damage and predict residual life for the element in the fatigue crack growth stage. The detection of fatigue critical1ocatiollS for a bridge section is based on the distribution of the effective stress range for the variable-amplitude spectrum obtained from strain history data measured by strain gauges on the section. The regular applications, or just after an accident, of the developed approach are expected to provide better understanding on the status of fatigue damage in the deck sections for the bridge under monitoring. In this paper, the application of the developed approach 011 fatigue damage assessment of the Tsing Ma Bridge is at last demonstrated.

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ID Code: 12853
Item Type: Conference Paper
Additional Information: For more information, please refer to the publisher's website (see hypertext link) or contact the author.
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Keywords: Fatigue damage, online assessment, bridge decks, structural health monitoring system, traffic loads, fatigue crack initiation, fatigue crack growth, damage detection, critical locations
ISBN: 0080437923
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Structural Engineering (090506)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Urban Development
Copyright Owner: Copyright 2000 Elsevier
Deposited On: 05 Mar 2008
Last Modified: 11 Aug 2011 01:36

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