| Project/Area Number |
14350244
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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 | Kobe University |
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Principal Investigator |
KAWATANI Mitsuo Kobe University, Faculty of Engineering, Professor, 工学部, 教授 (00029357)
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| Co-Investigator(Kenkyū-buntansha) |
KOBAYASHI Yoshikazu NICHIZO TECH INC., Structure & Bridge Department, Manager, 技術コンサルティング本部・第1技術部, 部長(研究職)
NOMURA Yasutoshi Kobe University, 自然科学研究科, 助手 (20372667)
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| Project Period (FY) |
2002 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥9,100,000 (Direct Cost: ¥9,100,000)
Fiscal Year 2004: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2003: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2002: ¥5,100,000 (Direct Cost: ¥5,100,000)
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| Keywords | Traffic-induced Vibration / Active Control / H-infinity Control / Footbridge / Vibration Serviceability / End-cross bracing reinforcement / アクティプ制御 |
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| Research Abstract |
This study attempted to apply two active control theories by introducing output feedback control and H-infinity control to traffic-induced vibration of bridge models. The efficiency and accuracy of the active controls were confirmed through model experiments. Furthermore, in order to clarify the control effect for the actual bridges, a theoretical analysis of the active controls were carried out based on the data of a response of Umeda Entrance Bridge of Hanshin Expressway due to a large dump truck. The applicability and accuracy of two active controls were discussed with a comparison of control results. From the results of output feedback control and H-infinity control, it was found that H-infinity control could reduce the bending vibration and coupled vibration of bending and torsion more effective than output feedback control.
Another attempt was made to confirm the effectiveness of the active control for the vibration of a footbridge induced by pedestrian loads. The observation foot
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bridge with span length of 30.1m and width of 3.4m often occurs complaints about an uncomfortable vibration. The bridge is located in front of a big event hall, in which many pedestrians use the footbridge during events. To solve this problem, first, the actual vibration range was examined from questionnaire results of feeling vibration in the field experiment. Second, the appropriate walking force model that matches the field experimental result was investigated among several walking force models. Finally, control analyses were carried out by applying tuned mass damper (TMD), output feedback control, H-infinity control and Fuzzy control. From the results, it was found that the TMD could not reduce the vibration induced by crowd walking. It was also clarified that all active controls could reduce effectively the vibration that was not reduced by TMD. In addition, it was understood that H-infinity control could reduce the vibration with less power in comparison with the other control methods. Less
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