Fracture research on Welded Beam-Column Connection under Cyclic Loading
| Project/Area Number |
13650640
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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 | Tokyo Denki University |
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Principal Investigator |
MIMURA Hiroaki Tokyo Denki Univ., College of Science Eng, Prof., 理工学部, 教授 (00057233)
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| Project Period (FY) |
2001 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2002: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2001: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | steel structure / welding / beam-column connection / crack propagation / fracture mechanics |
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| Research Abstract |
The fracture process composed of ductile crack initiation followed by stable crack growth and finally explosive failure in the welded beam-to-column connections we investigated experimentally.
Tested specimens were T-type connections consisted of the perimeter column and beam. The column was a rectangular hollow section (□-250x250x9), and the beam was H-section (BH-300x150x6x12). The test parameters were 1) welded access hole-in or out of existence of scallop 2) controlled displacement amplitude-1.0△_p to 2.5△_p.
The results of fracture test of welded beam-column connections under cyclic loading were as follows ;
1. Fracture of specimens were the fell wide failure of beam flange by the crack propagation from (1) the groove weld between the diaphragm and the beam flange in non-scallop type, (2) the bottom of scallop when the displacement-amplitude was over 1.5△_p, in scallop type.
2. The beam strength fell to 80% of full-plastic-moment of beam when the crack length grew up to 20% to 40% of flange width.
3. In the crack propagation rate relation dN/da = C(△J)^m, test results were m = 1.15 to 1.44 for non-scallop type, and m = 1.34 to 1.61 for scallop type.
4. The fatigue life of the non-scallop type were about two times of one of scallop type, so it made clear that non the scallop type was available structural detail under the disastrous earthquake motion.
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Report
(3 results)
Research Products
(21 results)
