| Project/Area Number |
63550415
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Building structures/materials
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| Research Institution | Kyushu University |
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Principal Investigator |
MAKINO Minoru Kyushu Univ., Faculty of E., Professor, 工学部, 教授 (80037978)
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| Co-Investigator(Kenkyū-buntansha) |
KAWANO Akio Miyakonojo National College of Tech., Architectural Dept., Associate Professor, 助教授 (50038105)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1989: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1988: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Beam to column connection of wide flanges / Out of plane beams / Yield ratio of panel to member / Max. shear strength / Energy absorption capacity / Width thickness ratio of member / 柱はり接合部 / 最大せん断耐力解析 / 部分骨組実験 |
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| Research Abstract |
In a steel frame of wide flange members beam to column connections have a great deal of shear deformation capacity which is essential in earthquake resistant design of steel frames. An experimental study on the load carrying capacity of these connections stiffened by out of plane beams are carried out. The experimental parameters in this test are the yield ratio of a connection and connected members, alpha , and width thickness ratios of column flanges.
Obtained results are as follows : (1) Elasto-plastic deformation behavior of frames subjected to horizontal shear forces changed at the yield ratio, alpha , of about 0.4. (2) In the frame with the yield ratio, alpha , exceeding 0.4, the maximum shear strength of the connection increased a little in the presence of the out of plane beams. (3) And the energy absorption of connections from beginning to maximum strength was not gained by the presence of the out of plane beams. (4) The width thickness ratio of column flanges gives no remarkable difference in the maximum shearing strength and the energy absorption capacity of the connection. However, deterioration of shearing strength after maximum is greater in the width thickness ratio of 15 than in that of 10. (5) In the case of alpha less than 0.4 , the maximum shear strength of the connection increased remarkably in the presence of out of plane beams and the lower alpha the more remarkable. (6) The energy absorption capacity up to the maximum strength is also remarkable in the case of alpha less than 0.4 . (7) The out of plane beams give the stiffness to the connection web irrespective of width thickness ratio of flanges in members. The stiffened connection web shows a great deal of energy absorption capacity and stable restoring force characteristics of the frame.
Thus the yield ratio of 0.4 in a connection and members is preferable in actual spatial frames in a view point of earthquake resistant design.
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