| Project/Area Number |
10650584
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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 |
Building structures/materials
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| Research Institution | Nara National Research Institute for Cultural Properties |
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Principal Investigator |
UCHIDA Akito NARA NATIONAL CULTURAL PROPERTIES RESEARCH INSTITUTE, CENTRE FOR ARCHAEOLOGICAL OPERATIONS, HEAD OF CONSERVATION TECHNIQUE SECTION, 埋蔵文化財センター・研究指導部, 室長 (90142017)
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| Co-Investigator(Kenkyū-buntansha) |
KAWAI Naohito BUILDING RESEARCH INSTITUTE, MINISTRY OF CONSTRUCTION CODES AND EVALUATION RESEARCH CENTER, HEAD OF EVALUATION SYSTEM DIVISION, 基準認証研究センター, 室長
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 1999: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1998: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | MICRO TREMOR MEASUREMENT / NATURAL FREQUENCY / DIAGNOSIS METHOD FOR SESMIC PERFORMANCE / VIBRATION MODE / DAMPING FACTOR |
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| Research Abstract |
As the traditional timber buildinds are generally valuable cultural properties, we usually have to employ the non destructive examination philosophy to understand their dynamic characteristics. Micro tremor measurement is a method of measuring the continuous micro vibration of the buildings whose amplitude is from 1/1000 mm to 1/100 mm with high sensitive sensors. This method is satisfactorily applicable as it is not to damage or swing the buildings and it is easy to place the sensors on the beam or floor during the measurement.
To clarify the dynamic characteristics of Japanese traditional timber buildings, micro tremor measurement were performed on nine buildings. By FFT analysis on the record of micro tremor, we obtained natural frequencies , damping factors and vibration modes of each building. Next, the lateral load- displacement relationships of five buildings among them were estimated, considering column rocking resistance and the effect of clay walls. And the values of natural frequency for parallel mode vibration were obtained using calculated values of initial stiffness and the estimated values of mass. Finally , the calculated values of natural frequency were compared with those observed in micro tremor measurements. The comparison showed an adequate correlation between the calculated values and the observed values of natural frequency, though the absolute values by calculation were lower than those observed. Therefore, micro tremor measurement seems to be applicable as one method in non-destructive diagnosis for seismic performance of.Japanese traditional timber buildings.
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