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元勝奎,朴福萬,劉承圭 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-
Slab design procedures are presented in detail in the Structural Standard Criteria. These are the Direct Design Method, the Equivalent Frame Design Method, and the Factored Method, is allowed under an appendix II in the Structural Standard Criteria. Slabs are frequently built with beams spanning from column to column around the perimeter of the building. These beams act to stiffen the edge of the slab and help to reduce the deflection of exterior panels of the slab. The distribution of the moment in slabs differ according to the flexural stiffness ratio of the beam to the flexural stiffness of a width of slab bounded laterally by the centerlines of the adjacent panels on each side of the beam Later a study of the relation between the distribution of the moment and the aspecft ratio of the slab, ι_(2)/ι_(1), and the relative stiffness, α, the slab with spans of 7.5m x 5.5m has been analyzed by each slabs design method A comparison of the slab moment from the Finite Element Method analysis, the Direct Design Method, the Equivalent Frame Method, and the Factored Method show for here are 1. If the relative stiffness of the beam by the aspect ratio of the slab will be more than 1, distribution of moment assigned to the column strip is strongly affected by the aspect ratio of the slab than the relative stiffness of the beam in the Direct Design Method and the Equivalent Frame Method. Since the aspect ratio of the squar slabs like model 1-1,1-2,1-3, equal to 1, the distribution in slab isn't sensitively affected by the relative stiffness of the beam 2. For a long span/short span(λ) equal to 1.36:1, Model 2-1,2-2,2-3 which computed by the Direct Design Method and the Equivalent Frame Method shows similar stress distribution or lager one compare with the Finite Element Analysis. On the other hand, the Factored Method underestimates the stress in long span direction and overestimates the moment in short direction. As the beam size become big, the variation of stress distribution decrease, only the positive moment which computed by the Direct Design Method and the Equivalent Frame Method in the middle strip in short directon underestimates compare with the Finite Element Method Analysis. As the beam size become big, the variation of stress distribution increase.
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