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Title |
Parametric Study on Long-Term Deflections of Flat Plates Considering Effects of Construction Loads and Cracking
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Keywords |
플랫 플레이트 ; 장기처짐 ; 시공하중 ; 균열 ; 철근콘크리트 Flat Plate ; Long-Term deflection ; Construction load ; Crack ; Reinforced concrete |
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Abstract |
The structural designs of RC flat plates that have no flexural stiffness by boundary beams may be governed not by strength conditions but by serviceabilities. Specially, since over-loading and tensile cracking in early-aged slabs significantly increase the immediate and long-term deflections of a flat plate system, a construction sequence and its impact on the slab deflections may be decisive factors in designs of flat plate systems. In this study, the procedure of calculating slab deflections with considering construction sequences, concrete cracking, and long-term effects is proposed. Using the proposed method, the parametric study for deflections of flat plates is performed. With various conditions for slab construction cycle, the number of shored floors, tensile or compressive reinforcement ratio, compressive strength of concrete, construction live load, and slab thickness, the immediate deflection during construction and long-term deflections after completion are analyzed. The calculated results are compared with the serviceability limits offered by the structural design code.
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