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    Effective Energy Criterion for Collapse of Deteriorating Structural Systems

    Source: Journal of Engineering Mechanics:;2017:;Volume ( 143 ):;issue: 012
    Author:
    Hao Zhou
    ,
    Jie Li
    DOI: 10.1061/(ASCE)EM.1943-7889.0001356
    Publisher: American Society of Civil Engineers
    Abstract: The collapse of building structures during earthquakes has drawn much attention to the safety assessment and seismic design of structures to prevent their collapse. From the perspective of the energy flow during a dynamic event, an energy criterion for the dynamic instability of hardening structures under arbitrary excitations was previously developed. In this paper, the criterion is modified for the collapse identification of deteriorating structures, using an effective form of internal and external work applied to the structures. To account for the dynamic stability of a structural system at different damage stages, two time-varying energy indexes are introduced: one for the description of the structural properties, i.e., the effective intrinsic energy; and the other for the measurement of external work, i.e., the valid input energy. The first passage of the structural effective intrinsic energy over the valid input energy is shown to be an important indicator of the system instability that leads to the collapse of the structure. If the effective intrinsic energy is always less than the valid input energy during a dynamic process, the structure will survive. Collapse assessments are carried out with regard to the validity of the criterion as applied to three different deteriorating structures. The results show that the proposed criterion is able to depict the dynamic stability state and to predict the specific time of the collapse occurrence for deteriorating structural systems.
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      Effective Energy Criterion for Collapse of Deteriorating Structural Systems

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4240432
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    contributor authorHao Zhou
    contributor authorJie Li
    date accessioned2017-12-16T09:14:48Z
    date available2017-12-16T09:14:48Z
    date issued2017
    identifier other%28ASCE%29EM.1943-7889.0001356.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4240432
    description abstractThe collapse of building structures during earthquakes has drawn much attention to the safety assessment and seismic design of structures to prevent their collapse. From the perspective of the energy flow during a dynamic event, an energy criterion for the dynamic instability of hardening structures under arbitrary excitations was previously developed. In this paper, the criterion is modified for the collapse identification of deteriorating structures, using an effective form of internal and external work applied to the structures. To account for the dynamic stability of a structural system at different damage stages, two time-varying energy indexes are introduced: one for the description of the structural properties, i.e., the effective intrinsic energy; and the other for the measurement of external work, i.e., the valid input energy. The first passage of the structural effective intrinsic energy over the valid input energy is shown to be an important indicator of the system instability that leads to the collapse of the structure. If the effective intrinsic energy is always less than the valid input energy during a dynamic process, the structure will survive. Collapse assessments are carried out with regard to the validity of the criterion as applied to three different deteriorating structures. The results show that the proposed criterion is able to depict the dynamic stability state and to predict the specific time of the collapse occurrence for deteriorating structural systems.
    publisherAmerican Society of Civil Engineers
    titleEffective Energy Criterion for Collapse of Deteriorating Structural Systems
    typeJournal Paper
    journal volume143
    journal issue12
    journal titleJournal of Engineering Mechanics
    identifier doi10.1061/(ASCE)EM.1943-7889.0001356
    treeJournal of Engineering Mechanics:;2017:;Volume ( 143 ):;issue: 012
    contenttypeFulltext
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