| Project/Area Number |
10650475
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | SETSUNAN UNIVERSITY |
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Principal Investigator |
ZUI Hiroshi SETSUNAN UNIVERSITY, FACULTY OF ENGINEERING, PROFESSOR, 工学部・土木工学科, 教授 (30236062)
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| Co-Investigator(Kenkyū-buntansha) |
HASHIMOTO Masaharu SETSUNAN UNIVERSITY,FACULTY OF ENGINEERING,PROFESSOR, 工学部・機械工学科, 助教授 (60180840)
NAMITA Yoshio SETSUNAN UNIVERSITY,FACULTY OF ENGINEERING,PROFESSOR, 工学部・土木工学科, 教授 (30198379)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1999: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | identification / flexual rigidity / axial forces / vibration method / extended kalman filter / cable structures / impact hammer / cable tension adjustment / truss members |
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| Research Abstract |
The vibration method is usually utilized on the measurement of cable tension during construction of cable bridges such as Nielsen bridges or cable stayed bridges. Practical formula for the vibration method previously proposed by authors is often used where bending rigidity is taken into account. The flexual rigidity of cable is assumed to be clear in this formula. Its values, however, change for various cable types and cable tension, and estimation of the values are difficult. In this paper, extended kalman filter is applied to the simultaneous identification of flexual rigidity and axial forces of cables and truss members. The multi-degree of freedom model reduced to some of lower order natural frequency mode is used as the mathematical model of axial members on the extended kalman filter in order to apply impact hammer because it is convenient as excitation method for field tests.
First, experiments are done using small steel bars and wires as cable and truss specimens and the effects of the method are confirmed. Next, steel bars in which we can get the exact flexural rigidity and cables are tested, and the effects of the method are examined. It is confirmed that tension and compression forces and bending rigidities of cables and truss members are estimated by the proposed method.
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