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      저자 : Tsutomu Yoshioka (검색결과 2 건)
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        Effects of local structural damage in a steel truss bridge on internal dynamic coupling and modal damping

        Hiroki Yamaguchi,Yasunao Matsumoto,Tsutomu Yoshioka 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.15 No.3

        Structural health monitoring of steel truss bridge based on changes in modal properties wasinvestigated in this study. Vibration measurements with five sensors were conducted at an existing Warrentruss bridge with partial fractures in diagonal members before and after an emergency repair work. Modalproperties identified by the Eigensystem Realization Algorithm showed evidences of increases in modaldamping due to the damage in diagonal member. In order to understand the dynamic behavior of the bridgeand possible mechanism of those increases in modal damping, theoretical modal analysis was conductedwith three dimensional frame models. It was found that vibrations of the main truss could be coupledinternally with local vibrations of diagonal members and the degree of coupling could change with structuralchanges in diagonal members. Additional vibration measurements with fifteen sensors were then conductedso as to understand the consistency of those theoretical findings with the actual dynamic behavior. Modalproperties experimentally identified showed that the damping change caused by the damage in diagonalmember described above could have occurred in a diagonal-coupled mode. The results in this study implythat damages in diagonal members could be detected from changes in modal damping of diagonal-coupledmodes.

      • SCIESCOPUS

        Effects of local structural damage in a steel truss bridge on internal dynamic coupling and modal damping

        Yamaguchi, Hiroki,Matsumoto, Yasunao,Yoshioka, Tsutomu Techno-Press 2015 Smart Structures and Systems, An International Jou Vol.15 No.3

        Structural health monitoring of steel truss bridge based on changes in modal properties was investigated in this study. Vibration measurements with five sensors were conducted at an existing Warren truss bridge with partial fractures in diagonal members before and after an emergency repair work. Modal properties identified by the Eigensystem Realization Algorithm showed evidences of increases in modal damping due to the damage in diagonal member. In order to understand the dynamic behavior of the bridge and possible mechanism of those increases in modal damping, theoretical modal analysis was conducted with three dimensional frame models. It was found that vibrations of the main truss could be coupled internally with local vibrations of diagonal members and the degree of coupling could change with structural changes in diagonal members. Additional vibration measurements with fifteen sensors were then conducted so as to understand the consistency of those theoretical findings with the actual dynamic behavior. Modal properties experimentally identified showed that the damping change caused by the damage in diagonal member described above could have occurred in a diagonal-coupled mode. The results in this study imply that damages in diagonal members could be detected from changes in modal damping of diagonal-coupled modes.

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