| 研究課題/領域番号 |
15K18108
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| 研究機関 | 早稲田大学 |
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研究代表者 |
林 偉偉 早稲田大学, 理工学術院, 准教授 (60623585)
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| 研究期間 (年度) |
2015-04-01 – 2018-03-31
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| キーワード | Composite beam / Hogging bending / Torsional moment / Experimental study / Numerical Analysis |
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| 研究実績の概要 |
In 2015, the applicant finished the literature review, and two steel-concrete composite beams were designed and built. The loading tests on two specimens were performed in January 2016, and different load eccentricities were used to apply the different negative bending / torsion ratios. Test results, including the applied load-displacement curves, strain development and distribution in different structural members, the crack formation and development process, and slip on the steel-concrete interface etc., were recorded. The failure modes, including the through crack of the concrete slab and the local deformation on the steel flange were also confirmed in the tests. On the basis of the test results, the mechanical behavior of steel-concrete composite beams under combined negative bending and torsion was tested, and the interaction relationship between negative bending and torsional moments was investigated. In addition, a paper entitled “Steel-Concrete Composite Beams Subjected to Combined Hogging Bending and Torsion” is under review for possible publication in the Eighth International Conference on Steel and Aluminum Structures to be held in Hong Kong.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The following tasks were finished by the applicant in 2015: (1) Literature review about the current research situation of mechanical behavior of steel-concrete composite beams were performed, and the results were used to make a detailed research plan; (2) Two steel-concrete specimens were prepared at the end of 2015, and different sensors were installed in the specimen during the construction. The specimen was 4600mm in length, and the concrete slab thickness was 250mm with a width of 800mm; (3) The loading tests were performed in January, 2016, and the effects of torsion moments in composite beams under negative bending moments were confirmed. The data obtained from the loading tests will be used to confirm the mechanical behavior of steel-concrete composite beams under combined negative bending and torsional moments, and those data will also be used for the numerical analysis to be performed in 2016 and 2017, and (4) A conference paper was prepared and is currently under review for possible publication in the Eighth International Conference on Steel and Aluminum Structures to be held in Hong Kong.
Therefore, up to now this research progress smoothly.
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| 今後の研究の推進方策 |
In 2016 and 2017, the numerical simulation of the loading tests will be performed. By using the test results, a FE model that capable of simulating the composite beams subjected to combined torsion and negative bending moment can be developed. The purpose is to propose a suitable numerical modeling method for such structures. The test results, including the load-displacement response, the strain development and distribution, as well as the slip on the interface etc. will be used to verify the numerical results.
Thereafter, the performed studies can be promoted into composite beams with various parameters by using numerical methods. Parametric analyses will be performed to investigate the effects of negative bending / torsion ratios on the mechanical performance of such beams. The results obtained from parametric study can be used for understanding the mechanical behavior of the composite beams under combined torsion and negative bending moments, and design guidelines for improving structural performance of such structures can be proposed.
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| 次年度使用額が生じた理由 |
In this year, research results obtained from the loading tests and the numerical analysis will be published in academic journals and international conferences, the page cost and the costs for travel expense are necessary. In addition, the devices for numerical analysis (hard disk etc.) as well as the design code (book) are also needed.
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| 次年度使用額の使用計画 |
The research results will be published in academic journals and international conferences, the cost for (international and domestic) Travel Expenses will be around 300 thousands JPY. The cost for large-volume hard drives and computation devices will be 150 thousands JPY. The cost for books will be around 50 thousands JPY. In addition, the indirect cost will be around 150 thousands JPY according to the University policy.
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