| Project/Area Number |
10450204
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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 |
Building structures/materials
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
NAKASHIMA Masayoshi Disaster Prevention Research Institute, Kyoto University, Assoc. Prof., 防災研究所, 助教授 (00207771)
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| Co-Investigator(Kenkyū-buntansha) |
SUITA Keiichiro Graduate School of Engineering, Kyoto University, Research Associate, 大学院・工学研究科, 助手 (70206374)
TTUJI Bunzo Graduate School of Engineering, Kyoto University, Prof., 大学院・工学研究科, 教授 (70031101)
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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 |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1999: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Steel Frame / Hysteretic Damper / Deformation Control / Optimum Stiffness |
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| Research Abstract |
This study is toward the establishment of seismic design of steel moment frames incorporated with hysteretic dampers. To this end, the following three subjects were examined : (1)modeling of hysteretic behavior of dampers made of low-yield steel; (2) dynamic test applied to frame subassemblies combined with hysteretic dampers; and (3)prediction of dissipated energy and maximum story drift of steel moment frames with those dampers.
Major findings obtained from this study are summarized as follows : (1)A mathematical model in which conspicuous strain hardening characteristic of the hysteretic dampers made of low-yield steel is explicitly allowed for was developed. A systematic procedure to determine the associated variables included in this model was also proposed. (2)Dynamic loading test indicated that among various effects associated with loading rate the increase in the resistance (strength) is most notable. (3)Extensive numerical analyses lead the following observations. (a) The most notable parameter that controls the distribution of dissipated energy and maximum story drift along the stories is the strength of the main frame, and the distribution remains relatively uniform as long as the main frame behaves only elastically. (b)When the main frame responds beyond its elastic limit the story drift tends to be concentrated at the story that experiences the first yield excursion. (c)The observation in (b)suggests that the uniformity of the dissipated energy and story drift along the stories is impaired with the increase of ground motion amplitudes.
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