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Title |
Jacking Force and Camber for Precast Concrete Slab Reinforcing
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DOI |
https://doi.org/10.11112/jksmi.2021.25.2.43 |
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Keywords |
프리캐스트 콘크리트 슬래브; 처짐; 균열; 캠버; 잭킹력 Precast concrete slab; Deflection; Crack; Camber; Jacking force |
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Abstract |
Precast concrete can be used to reduce construction period and enhance construct ability. However structural problems could be occurred due to the wrong application of boundary condition and misunderstanding of structural behavior in the process of segmentation of original structure system. I experienced a serious deflections and cracks due to the increase of bending moment and creep after the construction of precast concrete slab, and we learned that this is from the misunderstanding of support conditions and structure behaviors of precast slab panel. Two support columns under the precast slab are inserted to reduce the bending moment, and the camber according to jacking force should be estimated for the structural safety during the reinforcing work. A proper support condition and the flexural stiffness of precast concrete slab were applied to check the deflection and crack for existing structure by inverse analysis, and we can estimate the camber according to jacking force of the precast concrete slab, and suggest a method to make safe structure.
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