Upcoming SlideShare
×

# 10.01.03.049-One Way Slab

8,223 views

Published on

10 Likes
Statistics
Notes
• Full Name
Comment goes here.

Are you sure you want to Yes No
• Be the first to comment

Views
Total views
8,223
On SlideShare
0
From Embeds
0
Number of Embeds
11
Actions
Shares
0
562
0
Likes
10
Embeds 0
No embeds

No notes for slide

### 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