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SLAB DESIGN - ONE WAY
CE- 416
Pre-stressed Concrete Lab Sessional
Presented By:
Md. Abu Raihan

Id No:10.01.03.049
Course ...
PRESENTATION OUTLINE
 Definition Of Slab
 Definition Of One-Way Slab
 Deflection
 Design Concept
 Minimum Thickness O...
DEFINITION OF SLAB
Layer of reinforce-concrete with uniform/variable
thickness supported by restraints
 Figure:

11/25/2...
DEFINITION OF ONE WAY SLAB
 The ratio of the longer to the shorter side (L/B) of the slab
is at least equal to 2.0
 Supp...
PICTURE OF ONE WAY SLAB
PICTURE OF ONE WAY SLAB

11/25/2013

6
PICTURE OF ONE WAY SLAB

11/25/2013

7
DEFLECTION

11/25/2013

8
DEFLECTION

11/25/2013

9
DESIGN CONCEPT
 For the purpose of analysis and design, a unit strip of a
slab is cut out at right to the supported beams...
MINIMUM THICKNESS OF SLAB
 To control deflection, ACI Code 9.5.2.1 specifies
minimum thickness values for one-way solid s...
LOAD ASSIGNED OF SLAB

11/25/2013

12
LOAD ASSIGNED OF SLAB

11/25/2013

13
LOAD ASSIGNED OF SLAB

14
TEMPERATURE AND
SHRINKAGE REINFORCEMENT
 Concrete gets shrinks and results cracking
 Cracks known as Hairline cracks.
 ...
TEMPERATURE AND SHRINKAGE
REINFORCEMENT RATIO
Based on the Gross Concrete Area
Slabs with 40 or 50 grade reinforcement-0....
DESIGN PROCEDURE
Step-1: From given panel find out the Tmin.
Step-2: Find out the Factored Load.(Wu = 1.2*DL + 1.6*LL)
Ste...
REINFORCEMENT DETAILING

18
REINFORCEMENT DETAILING

11/18/2013

19
THANK YOU

11/25/2013

20
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Transcript of "10.01.03.049-One Way Slab"

  1. 1. SLAB DESIGN - ONE WAY CE- 416 Pre-stressed Concrete Lab Sessional Presented By: Md. Abu Raihan Id No:10.01.03.049 Course teachers: Munshi Galib Muktadir Sabreena Nasrin Department Of Civil Engineering Ahsanullah University of Science & Technology 11/25/2013 1
  2. 2. PRESENTATION OUTLINE  Definition Of Slab  Definition Of One-Way Slab  Deflection  Design Concept  Minimum Thickness Of One-Way Slab  Load Assigned To Slabs  Temperature And Shrinkage Reinforcement  Temperature And Shrinkage Reinforcement Ratio  Design Procedure 11/25/2013 2
  3. 3. DEFINITION OF SLAB Layer of reinforce-concrete with uniform/variable thickness supported by restraints  Figure: 11/25/2013 3
  4. 4. DEFINITION OF ONE WAY SLAB  The ratio of the longer to the shorter side (L/B) of the slab is at least equal to 2.0  Support conditions is an important impact.  Deflection is another important factor  Load is distributed to the direction perpendicular of the supporting restraints. 11/25/2013 4
  5. 5. PICTURE OF ONE WAY SLAB
  6. 6. PICTURE OF ONE WAY SLAB 11/25/2013 6
  7. 7. PICTURE OF ONE WAY SLAB 11/25/2013 7
  8. 8. DEFLECTION 11/25/2013 8
  9. 9. DEFLECTION 11/25/2013 9
  10. 10. DESIGN CONCEPT  For the purpose of analysis and design, a unit strip of a slab is cut out at right to the supported beams.  The method here is used for rectangular beams.  Figure 11/25/2013 10
  11. 11. MINIMUM THICKNESS OF SLAB  To control deflection, ACI Code 9.5.2.1 specifies minimum thickness values for one-way solid slabs, shown in Table. Element Simply Supported One-End Continuous Both-End Continuous Cantilever One-way Slab L/20 L/24 L/28 L/10 L is the span length direction of bending. If Wc ≈ 90 – 120 psf factor will be applied by ( 1.65-0.005Wc) If Fy ≠ 60 ksi factor will be ( 0.4 + Fy/100000) 11/25/2013 11
  12. 12. LOAD ASSIGNED OF SLAB 11/25/2013 12
  13. 13. LOAD ASSIGNED OF SLAB 11/25/2013 13
  14. 14. LOAD ASSIGNED OF SLAB 14
  15. 15. TEMPERATURE AND SHRINKAGE REINFORCEMENT  Concrete gets shrinks and results cracking  Cracks known as Hairline cracks.  provide special reinforcement for shrinkage and temperature contraction in the direction perpendicular to the main reinforcement.  Maximum lateral spacing 5h or 8″ 11/25/2013 15
  16. 16. TEMPERATURE AND SHRINKAGE REINFORCEMENT RATIO Based on the Gross Concrete Area Slabs with 40 or 50 grade reinforcement-0.002 Slabs with 60 grade reinforcement-0.0018  Slabs where reinforcement with yield stress exceeding 60 KSI at 35% yield-(0.0018*60000)/Fy 11/25/2013 16
  17. 17. DESIGN PROCEDURE Step-1: From given panel find out the Tmin. Step-2: Find out the Factored Load.(Wu = 1.2*DL + 1.6*LL) Step-3: Find out Moments of the panel. (M = Moment Coefficients*Wu*L²) Step-4: Find out maximum steel ratio (ρmax = 0.85*β1*(f´c/fy)*(εu/ εu + 0.004) Step-5: Find dreq. ( ) Step-6: As and a. ( ) Step-7: Temperature and shrinkage reinforcement Step-7: Reinforcement Detailing. 11/25/2013 17
  18. 18. REINFORCEMENT DETAILING 18
  19. 19. REINFORCEMENT DETAILING 11/18/2013 19
  20. 20. THANK YOU 11/25/2013 20
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