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Typhoon-induced accumulated fatigue damage evaluation using health monitoring data

Yu, Y. , Chan, Tommy H.T., & Li, Z.X. (2006) Typhoon-induced accumulated fatigue damage evaluation using health monitoring data. In 3rd International Conference on Protection of Structures Against Hazards, Sept.28-29, 2006, Venice, Italy.

Abstract

Typhoons are very common in Hong Kong during May to November each year, so within this typhoon prone regions the safeties and reliability of the large civil infrastructures such as long-span cable-supported bridges are some of the most important issues that should be considered. This paper aims to evaluate the effects of typhoons on fatigue damage accumulation in steel decks of long-span suspension bridges using Tsing Ma Bridge in Hong Kong as a case study. The strain-time histories at the identified critical locations of deck sections of the bridge during different typhoons passing the bridge area are investigated using on-line strain data acquired from the structural health monitoring system installed on the bridge. The fatigue damage models based on Miner’s Law and Continuum Damage Mechanics (CDM) with the correspondingly developed finite element model are applied to calculate the increment of fatigue damage due to the action of a typhoon. Accumulated fatigue damage during the typhoon is also calculated and compared between Miner’s Law and the CDM method. It is found that for the Tsing Ma Bridge case, the stress spectrum generated by a typhoon is significantly different from that generated by normal traffic and its histogram shapes can be described approximately as a Rayleigh distribution. The influence of typhoon loading on accumulative fatigue damage is more significant than that due to normal traffic loading. The increment of fatigue damage generated by hourly stress spectrum for the maximum typhoon loading may be much greater than those for normal traffic loading. It is, therefore, concluded that it is necessary to evaluate typhoon induced fatigue damage for the purpose of accurately evaluating accumulative fatigue damage and structural health assessment of the bridge for the bridge administration to make cost-effective decisions regarding inspection, maintenance and repair.

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ID Code: 12717
Item Type: Conference Paper
Additional Information: For more information, please refer to the conference’s website (see hypertext link) or contact the author.
Additional URLs:
Keywords: Typhoon, structural health monitoring, fatigue damage, Miner's law, continuum damaga machincs
Subjects: Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000)
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 2006 CI-PREMIER Pte Ltd
Deposited On: 28 Feb 2008
Last Modified: 11 Aug 2011 04:34

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