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Flat plate slab design (10.01.03.052)

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Yeasir Gerrard
Yeasir Gerrard

This document discusses the design of flat plate slabs. Flat plates are concrete slabs that are carried directly by columns without beams or girders. They are commonly used for spans up to 25 feet and loads up to 100 pounds per square foot. The load is directly transferred to the columns, making punching shear at the column connections critical. Proper reinforcement detailing is required between the slab and columns. Moment determination and shear design are important steps in the flat plate slab design process. Advantages include simplified formwork and reduced story height, while limitations include increased thickness and weight.

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PRESTRESS CONCRETE DESIGN SESSIONAL (CE-416) WELCOME TO THE PRESENTATION ON FLAT PLATE (SLAB DESIGN)…… YEASIR MASUD ID NO: 10.01.03.052
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)
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).
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
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.
Analysis (Moment Determination): 1. A method of frame analysis such as moment distribution, or stiffness method or a Computer. 2. A simplified method using the moment & shear co-efficient Table.
STEPS OF FLAT PLATE SLAB DESIGN DETERMINE THICKNESS DEAD & LIVE LOAD CALCULATION MOMENT CALCULATION BY USING TABLS & CO-EFFICIENTS REINFORCEMENT DESIGN SHEAR CHECK
Figure: Design Moment & Shears for flat plate floor interior Panel C. (a): Moments (b): Shears
 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
 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
Flat plate slab design (10.01.03.052)

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Flat plate slab design (10.01.03.052)

  • 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 the moment & shear co-efficient Table.
  • 7. STEPS OF FLAT PLATE SLAB DESIGN DETERMINE THICKNESS DEAD & LIVE LOAD CALCULATION MOMENT CALCULATION BY USING TABLS & CO-EFFICIENTS REINFORCEMENT DESIGN SHEAR CHECK
  • 8.
  • 9.
  • 10. Figure: Design Moment & Shears for flat plate floor interior Panel C. (a): Moments (b): Shears
  • 11.  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
  • 12.
  • 13.  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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