2003 Fiscal Year Final Research Report Summary
Detection of damage and loading on the bridge and its service structure by raser doppler vibrometers
| Project/Area Number |
14350238
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
構造工学・地震工学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
FUJINO Yozo The University of Tokyo, Graduate School of Engineering, Professor, 大学院・工学系研究科, 教授 (20111560)
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| Co-Investigator(Kenkyū-buntansha) |
ABE Masato The University of Tokyo, Graduate School of Engineering, Associate Professor, 大学院・工学系研究科, 助教授 (60272358)
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| Project Period (FY) |
2002 – 2003
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| Keywords | scanning laser / dynamic load detection / inverse analysis / modal analysis / laser doppler vibrometer / higher modes identification / ERA method |
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| Research Abstract |
Identification of external forces applied on a structure during its operational life is of practical importance for structural design and maintenance. Especially, identification using dynamic measurement has attracted much research interest because of its relative advantage in measurement. In this study, forces in 3 different types are identified experimentally, i.e, impact-force, inertia force and sound pressure using Laser Doppler Vibrometers. Identification methods employed are : pseudo-inverse method and regularization method. Error obtained from each identification method and each experimental case is evaluated and the proposed method is shown to have wide applicability to various loading cases.
Damage identification of bolted joints by Laser Doppler Vibrometers is also studied experimentally. It was confirmed that detection of loosened bolts can be made from the change of the modal property measured carefully by LDV.
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Research Products
(12 results)
