flat plate slab design (10.01.03.052)

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  • 1.PRESTRESS CONCRETE DESIGN SESSIONAL (CE-416) WELCOME TO THE PRESENTATION ON FLAT PLATE (SLAB DESIGN)YEASIR MASUD ID NO: 10.01.03.052

2. What Is FLATE PLATES FLATE PLATES: Flat Plates are concrete slabs which are carried directly by columns, without the use of beams or girders..Uses : Commonly used where spans are not large (20 to 25 ft). & also loads not particularly heavy (60 to 100 Psf) 3. DIFFERENCE BETWEEN TWO WAY & FLAT PLATE TWO WAY SLAB: Slabs are resting on T-Beams. Slab load transfer to the beams and then in to the columns.FLAT PLATE SLAB : load is directly transferred to the columns the shear is very critical at the area of connection of slab with column (called punching shear). 4. LITTLE CONFUSION REGARDING FLAT PLATE & FLAT SLAB!!!!!!!!!!!!! The flat plat is a slab of uniform thickness while in flat slab there is thickened slab region in the vicinity of the column that includes either drop panel or column capitals.Figure: Drop Panel & Column Head 5. ENSURE THAT: Reinforcement bars should be properly detailed between the columns and slabs. Punching shear checks are critical & vertical shear reinforcement should be detailed accordingly. 6. Analysis (Moment Determination): 1.A method of frame analysis such as moment distribution, or stiffness method or a Computer.2. A simplified method using themoment & shear co-efficient Table. 7. STEPS OF FLAT PLATE SLAB DESIGN DETERMINE THICKNESSDEAD & LIVE LOAD CALCULATIONMOMENT CALCULATION BY USING TABLS & CO-EFFICIENTSREINFORCEMENT DESIGNSHEAR CHECK 8. Figure: Design Moment & Shears for flat plate floor interior Panel C. (a): Moments (b): Shears 9. Another Important Aspect regarding flat plate design is punching shear at the columns which require supplementary shear reinforcement, & transfer of unbalanced moments to the column which may require additional flexural bars in the negative bending region of the column strip 10. ADVANTAGES:The simplified Formwork. Reducing the Story Height which makes it Economical. There are no beams to obstruct light & circulation of air. Less danger of concrete spalling & exposing reinforcement.LIMITATIONS: Loads due to higher thickness of plate elements as required to control deflection Stiffness & weight consideration in earthquake areas

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