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10.01.03.049-One Way Slab
 

10.01.03.049-One Way Slab

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    10.01.03.049-One Way Slab 10.01.03.049-One Way Slab Presentation Transcript

    • 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
    • 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
    • DEFINITION OF SLAB Layer of reinforce-concrete with uniform/variable thickness supported by restraints  Figure: 11/25/2013 3
    • 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
    • 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.  The method here is used for rectangular beams.  Figure 11/25/2013 10
    • 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
    • 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.  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
    • 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
    • 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
    • REINFORCEMENT DETAILING 18
    • REINFORCEMENT DETAILING 11/18/2013 19
    • THANK YOU 11/25/2013 20