Design of Reinforced Concrete External Beam to Column Joints Subjected to Earthquake Loading
| Project/Area Number |
60460174
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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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 |
MORITA Shiro Professor, Faculty of Engineering, Kyoto University, 工学部, 教授 (30025902)
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| Co-Investigator(Kenkyū-buntansha) |
KAKU Tetsuzo Associate Professor, The University of Technology Toyohashi, 建設系, 助教授 (40026092)
FUJII Shigeru Research Associate, Faculty of Engineering, Kyoto University, 工学部, 助手 (70144334)
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| Project Period (FY) |
1985 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥7,300,000 (Direct Cost: ¥7,300,000)
Fiscal Year 1986: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1985: ¥4,300,000 (Direct Cost: ¥4,300,000)
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| Keywords | Beam-Column Joints / Bi-directional Loading / Two-Way Frame / Seismic Design, Developement Length / 曲げ下げ定着 / 接合部補強 / スラブ効果 |
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| Research Abstract |
The aim of the project is to provide a proposal for seismic design of external beam-column joints in reinforced concrete two-way framed structures. Tests were performed on bare beam-column assemblages having one-way or two-way beams and slab-beam-column assemblages of two-way frames.
From the test results, following remarks were derived;
1. In external joints, joint shear is transferred mainly by the diagonal compression strut mechanism rather than the truss mechanism. Therefore, horizontal joint hoops are effective to confining concrete struts.
2. Downward bending of bottom beam bars, the standard details of Japanese practice, accelerates the deterioration of joint shear capacity and rigidity.
3. Column axial force improves joint crack capacity and deterioration rate of shear rigidity.
4. Though the unloaded transverse beams are effective to improve the behavior in the direction of the main beam, this effect is cleary lost after the excursion of transverse beams into the plastic deformation range. Simultaneous bi-direction loading of slab-beam-column assemblages increases the energy dissipation capacity in comparison with alternative uni-directional loading.
5. Based on the test results, a seismic design method for external beam-column joints was proposed.
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Report
(1 results)
Research Products
(13 results)
