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An Investigation on Structural Design of Reinforced Concrete Slabs with Steps : 단차가 있는 철근콘크리트 슬래브의 구조설계에 관한 연구
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- Authors
- Advisor
- 강현구
- Major
- 공과대학 건축학과
- Issue Date
- 2014-02
- Publisher
- 서울대학교 대학원
- Keywords
- Step ; Flat plate ; Additional bar ; Modification factor ; Effective beam width
- Description
- 학위논문 (석사)-- 서울대학교 대학원 : 건축학과, 2014. 2. 강현구.
- Abstract
- Reinforced concrete slabs with steps were experimentally studied to analyze their structural performance and to suggest reinforcing details of the step. Because the stepped slabs may behave very poorly in terms of bending strength, stiffness, deflection, cracking, etc., the study is aimed at suggesting proper reinforcing details so that the same bending strength as that without steps can be obtained. The bending strengths of 12 test specimens with a variety of different reinforcing detail types or other parameters were compared with one another. The specimen without any additional reinforcement in the step exhibited a very low bending strength and significant damage, and the specimens with diagonal reinforcements in the step manifested substantial early cracks and hinging of the step as well as a substantial loss of the bending strength. On the contrary, the specimens with a combination of U-bars, revU-bars, L-bars, and revL-bars performed very well and reached up to 100 % of the slab bending strength. U-bars and revU-bars were effective in controling diagonal cracks, while L-bars and revL-bars were effective in preventing the yielding of slab reinforcement near the step.
The second purpose of the analysis of this study was to propose a modification factor to reflect the stiffness modification of a step in flat plates. Reinforced concrete slabs with steps exhibit distinct structural characteristics that are determined by a series of structural experiment and nonlinear analysis. The corner of the step was weak and flexible, and thus the rotational stiffness at the corner of the step was investigated through the analyses with 6 types of models using a nonlinear finite element program. Then, a systematic analysis on the stiffness change was performed using a linear finite element procedure along with rotational springs. The stiffness of reinforced concrete flat plates with steps was mainly affected by the step length, location, thickness and height. First, a single modification factor for each of these variables was obtained, while other variables were constrained. When the influence of multiple variables were simultaneously considered, the single modification factor was multiplied by one another. This method was verified by a comparative analysis, and, finally, it was found that the complex modification factor as suggested in this study could be used together with the existing effective beam width model.
- Language
- English
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