| Project/Area Number |
11650595
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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 | Meiji University |
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Principal Investigator |
ARAKAWA Toshiharu Meiji University, School of Scienc and Technology, Associate Professor, 理工学部, 助教授 (80159491)
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| Co-Investigator(Kenkyū-buntansha) |
KOH Tadaki Meiji University, School of Scienc and Technology, Professor, 理工学部, 教授 (10061904)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2000: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1999: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | Reinforced Concrete / Stack / Structure Design / Damping Ratio / Natural Frequency / Vibration Measurement / Microtremor / Man-power Excitation / 振幅依存性 |
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| Research Abstract |
The purposes of this study are to evaluate the vibration characteristics and to clarify the structure design method for high rise reinforced concrete stacks. The contents of this study are divided into following each subjects :
1. The damping ratios are estimated from the amplitude of free vibration waves which are theoretically made using ramdom decrement technique, and damping ratios of first mode were evaluated belower than 1.0 %.
2. The natural frequencies are estimated from fourier spectrum of measuring waves or eigenvalue analyses. The design values of the frequencies could be accurately estimated.
3. It is to investigate on the amplitude dependence of the vibration characteri stics which are the damping ratio and the natural frequency. The damping ratios for microtremors were smaller than the damping ratios for the man-power excitation. And the natural frequencies were scarcely influenced by the amplitude dependence.
4. It is discussed the method for reducing of the earthquake response of those stacks using several type dampers. The type of dampers is viscous type, stiffness type, or mass type.
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