1992 Fiscal Year Final Research Report Summary
Strength and collapse behaviors of stiffened patch-loaded web plates
| Project/Area Number |
03805038
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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 |
土木構造
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| Research Institution | Shinshu University |
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Principal Investigator |
SHIMIZU Shigeru Shinshu Univ., Dept of Civil Engrg., Associate Professor, 工学部, 助教授 (90126681)
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| Co-Investigator(Kenkyū-buntansha) |
MIKI Toshihiro Daido Institute of Technology Associate Professor, 工学部, 助教授 (90137175)
OHKAMI Toshiyuki Shinshu Univ., Computer Center Associate Professor, 総合情報処理センター, 助教授 (80152057)
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| Project Period (FY) |
1991 – 1992
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| Keywords | Web plate / patch loading / load carrying capacity / collapse mechanism / stiffener effect |
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| Research Abstract |
This study deals with patch loaded web plates, modeling themselves upon girders erected with launching method. To stiffen such web plates, a horizontal stiffener is generally used because a load bearing stiffener cannot be arranged to such web plates. However, a horizontal stiffener is originaly aimed to restrain not the buckling due to the patch load but the buckling due to in-plane bending. Thus discussion on the effectiveness of a stiffener is required.
In this study, an elasto-plastic large deflection FEM program is used for the analysis, and existence, location and stiffness of a horizontal stiffener, magnitude of in-plane bending moment and so on are adopted as parameters.
Through the analysis, followings are found;
1. Strength of patch loaded web plates are reduced considerably by in-plane bending moment.
2. On a case of no or small in-plane moment, the ultimate strength of web plates with a horizontal stiffener is sometimes smaller than the strength of those with no stiffener.
3. Even on above case, a horizontal stiffener increases buckling strength of web plates.
4. The collapse mode of web plates are classified into following four types according to the parameters; (1) Collapse by the mechanism having two yield lines. (2) Collapse by yield lines and in-plane compression yielding at the bottom of the web plate. (3) Collapse by the in-plane compression at the bottom of the web plate. (4) Collapse by yielding of the upper and lower flanges due to the girder bending.
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