| Project/Area Number |
02402043
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Building structures/materials
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| Research Institution | Kyoto University |
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Principal Investigator |
MUGURUMA Hiroshi Department of Architectural Engineering, Faculty of Engineering, Kyoto University, Professor, 工学部, 教授 (30025829)
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| Co-Investigator(Kenkyū-buntansha) |
KATO Hiroto Large Scale Structure Testing Division, Production Department, Building Research, 建築研究所・企画部企画調査課, 企画係長
NISHIYAMA Minehiro Department of Architectural Engineering, Faculty of Engineering, Kyoto Universit, 工学部, 助手 (50183900)
WATANABE Fumio Department of Architectural Engineering, Faculty of Engineering, Kyoto Universit, 工学部, 助教授 (50026267)
田中 仁史 京都大学, 工学部, 助手 (20132623)
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| Project Period (FY) |
1990 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥14,600,000 (Direct Cost: ¥14,600,000)
Fiscal Year 1991: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1990: ¥12,900,000 (Direct Cost: ¥12,900,000)
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| Keywords | Concrete / Prestress / Reinforced concrete / Joint / Prestessed concrete / Earthquake / Analysis / Experiment |
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| Research Abstract |
The objectives of this study are ; (1) to compare the load - deflection hysteresis loops of prestressed and reinforced concrete beam - column joint assembles under reversed cyclic loading, and to study their joint shear behavior, (2) to idealize prestressed, partially prestressed and reinforced concrete, moment - curvature relationships, (3) to scrutinize seismic response of prestressed concrete building frames, (4) to study how to improve their seismic performance, and finally, (5) to suggest an appropriate design philosophy of them.
The tests were conducted on four prestressed and two reinforced concrete, beam - extemal column assemblages. The test results obtained revealed that prestressing tendon in the beam and passing through the joint core improved not only the shear behavior but also energy absorption capacity of the beam-column joint assemblage.
In another trust program, one reinforced and three prestressed concrete beam - extemal column joint assemblages were tested. For the re
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inforced concrete assemblage, the subsequent reduction in stiffness and strength was observed due to yield penetration of beam longitudinal reinforcement followed by development of full depth cracks, while the test unit with a prestressing force of 0.06 fc-Ag was able to be loaded to beyond a beam rotation angle of 1/15 with little reduction in sniffness and strength. However, too much prestress resulted in less ductility in the prestressed concrete beams.
An idealization of prestressed, partially prestressed and reinforced concrete moment - curvature relationships was proposed on the basis of the experimental work and analytical work described above.
Two-dimensional dynamic response analyses conducted on prestressed and reinforced concrete frames using the above idealization revealed that the interstory drift responses of prestressed concrete frames were 10% in average larger than those of equivalent reinforced concrete ones. The responses of partially prestressed concrete frames are as large as those of equivalent reinforced concrete ones. However, it was verified that the results of the dynamic response analyses depended very much on the structural configuration and the selected ground acceleration record. Less
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