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    Dynamic Monitoring of Steel Girder Highway Bridge

    Source: Journal of Bridge Engineering:;2002:;Volume ( 007 ):;issue: 006
    Author:
    Jun Zhao
    ,
    John T. DeWolf
    DOI: 10.1061/(ASCE)1084-0702(2002)7:6(350)
    Publisher: American Society of Civil Engineers
    Abstract: Currently there are different monitoring techniques that have been considered for use in the structural evaluation of bridges. These include approaches based on both static and dynamic behavior. The use of dynamic properties has advantages over static properties, since components of the dynamic properties are only marginally influenced by variations in the loading. When dynamic properties are used, field studies have shown that it is not always sufficient to use only natural frequencies and modal displacements. Some research for structural evaluation of bridges indicates that techniques based on use of derivatives of the natural frequencies and the modal displacements may be more effectively used to generate effective diagnostic parameters for structural identification. This paper presents the results of applying one of these methods, the modal flexibility approach, to a field study of a bridge in which the bearings were partially restrained in colder weather. While others have used impact methods with the modal flexibility method, in this study the approach is modified so that excitation is provided by vehicular traffic. The results show that the modified modal flexibility method provides a clear indication that there have been changes in the bridge’s structural behavior.
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      Dynamic Monitoring of Steel Girder Highway Bridge

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    http://yetl.yabesh.ir/yetl1/handle/yetl/50646
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    contributor authorJun Zhao
    contributor authorJohn T. DeWolf
    date accessioned2017-05-08T21:25:03Z
    date available2017-05-08T21:25:03Z
    date copyrightNovember 2002
    date issued2002
    identifier other%28asce%291084-0702%282002%297%3A6%28350%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/50646
    description abstractCurrently there are different monitoring techniques that have been considered for use in the structural evaluation of bridges. These include approaches based on both static and dynamic behavior. The use of dynamic properties has advantages over static properties, since components of the dynamic properties are only marginally influenced by variations in the loading. When dynamic properties are used, field studies have shown that it is not always sufficient to use only natural frequencies and modal displacements. Some research for structural evaluation of bridges indicates that techniques based on use of derivatives of the natural frequencies and the modal displacements may be more effectively used to generate effective diagnostic parameters for structural identification. This paper presents the results of applying one of these methods, the modal flexibility approach, to a field study of a bridge in which the bearings were partially restrained in colder weather. While others have used impact methods with the modal flexibility method, in this study the approach is modified so that excitation is provided by vehicular traffic. The results show that the modified modal flexibility method provides a clear indication that there have been changes in the bridge’s structural behavior.
    publisherAmerican Society of Civil Engineers
    titleDynamic Monitoring of Steel Girder Highway Bridge
    typeJournal Paper
    journal volume7
    journal issue6
    journal titleJournal of Bridge Engineering
    identifier doi10.1061/(ASCE)1084-0702(2002)7:6(350)
    treeJournal of Bridge Engineering:;2002:;Volume ( 007 ):;issue: 006
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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