| Project/Area Number |
07555643
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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 | 試験 |
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| Research Field |
Building structures/materials
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
WADA Akira Tokyo Institute of Technology, Materials and Structures Laboratory, Professor, 応用セラミックス研究所, 教授 (90158684)
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| Co-Investigator(Kenkyū-buntansha) |
IWATA Mamoru Nippon Steel Corporation, Steel Structures Department, Managing Director, 研究職, 部長
YAMADA Takahiro Tokyo Institute of Technology, Materials and Structures Laboratory, Research Ass, 応用セラミックス研究所, 助手 (40240022)
YI HUA Huang Tokyo Institute of Technology, Materials and Structures Laboratory, Research Ass, 応用セラミックス研究所, 助手 (50262324)
SHINOHARA Yasuji Tokyo Institute of Technology, Materials and Structures Laboratory, Associate Pr, 応用セラミックス研究所, 助教授 (50196408)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1996: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | Steel Structures / Seismic Design / Structural Design / Stress / Strain / Plastic Deformation |
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| Research Abstract |
This paper is aimed to study the cyclic behavours of high strength steels with weld connection. Many fractures in or near the welds of bottom flange of beams connected to the columns had been observed in the investigations after Northridge Earthquake of USA (1994) and Hyogoken-Nanbu Earthquake of Japan (1995). Although in principle the high strength steels are assumed to be used below the yield point (within elastic range) in the damage tolerant structures, it is still necessary that the inelastic cyclic behaviors of high strength steels should be studied experimentally in case of extreme large earthquake. The most critical reason to result in the fracture at beam ends is the concentration of inelastic strain which is greatly influenced by the welding defective, heat affect and stress gradient. In this experimental study, a large number of test specimens with weld connection using 4 kinds of high strength steels and 2 kinds of plain strength steels had been manufactured. Tension and compression cyclic loading was carried out controlled by the measured displacement. It was found that the inelastic deformation capacity of high strength steels was dramatically reduced due to the influence of weld connection. Unfortunately, some of specimens were broken in brittle during the cyclic loading experiments. Although it is no problem for high strength steels with weld connection to be used in the elastic range, further detailed researches and advanced technologies should be necessary before the high strength steels could be put into the use of seismic structures if the plastic deformation of high strength steel is expected.
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