1987 Fiscal Year Final Research Report Summary
Deformation Characteristics of Beams and Beam-Columns Subjected to Nonstationary Loading History at Strain Hardening Region.
| Project/Area Number |
61460157
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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 |
土木構造
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| Research Institution | Musashi Institute of Technology |
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Principal Investigator |
NISHIWAKI Takeo Musashi Institute of Technology, 工学部, 教授 (60061462)
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| Co-Investigator(Kenkyū-buntansha) |
MINAGAWA Masaru Musashi Institute of Technology, 工学部, 助手 (50147899)
MASUDA Nobutoshi Musashi Institute of Technology, 工学部, 助教授 (00016700)
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| Project Period (FY) |
1986 – 1987
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| Keywords | Beam / Beam-Column / Elasto-Plastic Analysis / Cyclic Loading / Loading History / Strain Hardening / ひずみ硬化 / 接線剛性法 |
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| Research Abstract |
In this study, a cyclic plasticity model for elasto-plastic hysteretic behaviors of structural steel is employed. The model is constructed by the refinements of a multi surface plasticity model introduced by Petersson and Popov. This model is applied to mild steel and high strength steel. Using material property functions obtained, elasto-plastic finite element analyses are carried out for round-bar specimens subjected to repetitive tension- compression loading under controlled strain. By comparing the results with those of corresponding experiments, it is confirmed that the accuracy of the stress-strain relations calculated by means of the proposed model is good gnough from the engineering standpoint. In order to calculate M-<PHI> relations of beams and beam-columns by means of the proposed stress-strain odel, the tangent stiffness method introduced by Chen and Atsuta is employed with some amendments. JIS(Japanese Industrial Standards)-5 typespecimens were shaped from a H-shaped beam specimen. Material property functions were determined by a combination of tension tests and tension-compression tests. Distribution of residual stress was analyzed by the drilling method and a simple type distribution was assumed. The calculated M-<PHI> relations are compared with those obtained by experiments which the author has carried out and it is confirmed that the accuracy of the hysteretic M-<PHI> relations calculated by means of the proposed model is good enough from the engineering standpoint.
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