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    Building Damage Estimates Using Slowness Change in Propagating Waves

    Source: Journal of Structural Engineering:;2017:;Volume ( 143 ):;issue: 004
    Author:
    Mayako Yamaguchi
    ,
    Masahiro Kurata
    ,
    Masatoshi Miyazawa
    DOI: 10.1061/(ASCE)ST.1943-541X.0001683
    Publisher: American Society of Civil Engineers
    Abstract: This paper presents a damage-evaluation method that estimates the damage level of buildings using ambient vibration measurement and a seismic interferometry technique. A new index, named slowness change and which directly relates the reduction in story stiffness to the vibration signal’s travel-time delays in propagating waves, is introduced. The sensitivity of the slowness change to damage was examined through ambient vibration testing for a quarter-scale steel frame, where damage was simulated by removing steel links at member ends. The slowness changes computed from the measurement data increased significantly as the number of fractures increased and the story stiffness decreased. The results showed a strong relationship between the location and amount of simulated fractures and the slowness change. The paper also discusses the signal-processing and measurement parameters required to accurately identify the parameters of the propagating waves, error associated with signal processing and measurement, and a borderline between detectable and undetectable damage for both beam fractures and column fractures in steel frames.
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      Building Damage Estimates Using Slowness Change in Propagating Waves

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4237078
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    contributor authorMayako Yamaguchi
    contributor authorMasahiro Kurata
    contributor authorMasatoshi Miyazawa
    date accessioned2017-12-16T08:58:58Z
    date available2017-12-16T08:58:58Z
    date issued2017
    identifier other%28ASCE%29ST.1943-541X.0001683.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4237078
    description abstractThis paper presents a damage-evaluation method that estimates the damage level of buildings using ambient vibration measurement and a seismic interferometry technique. A new index, named slowness change and which directly relates the reduction in story stiffness to the vibration signal’s travel-time delays in propagating waves, is introduced. The sensitivity of the slowness change to damage was examined through ambient vibration testing for a quarter-scale steel frame, where damage was simulated by removing steel links at member ends. The slowness changes computed from the measurement data increased significantly as the number of fractures increased and the story stiffness decreased. The results showed a strong relationship between the location and amount of simulated fractures and the slowness change. The paper also discusses the signal-processing and measurement parameters required to accurately identify the parameters of the propagating waves, error associated with signal processing and measurement, and a borderline between detectable and undetectable damage for both beam fractures and column fractures in steel frames.
    publisherAmerican Society of Civil Engineers
    titleBuilding Damage Estimates Using Slowness Change in Propagating Waves
    typeJournal Paper
    journal volume143
    journal issue4
    journal titleJournal of Structural Engineering
    identifier doi10.1061/(ASCE)ST.1943-541X.0001683
    treeJournal of Structural Engineering:;2017:;Volume ( 143 ):;issue: 004
    contenttypeFulltext
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