RCC One Way Slab Design: WSD Method

In the case of RCC One Way Slab Design, the width of the slab is considered as a span and a 1 meter strip with width is designed like a beam.



RCC One Way Slab
fig-1: RCC One Way Slab

RCC One Way Slab Design:

  • Step 1: RCC One Way Slab Design load

Slab weight: Determining the depth of the rcc one way slab, the weight of the slab per square meter is determined by the weight of the unit. Note that the minimum thickness or depth of the_slab should be considered correct by the bending moment.

  • The number of live loads and other dead loads per square in the_slab.
  • Total spacious load on the span.

W= {(Slab weight + live load and other loads) × Span length} kg

  • Step 2: Maximum Shear





The highest vertical shear ‘V’ is determined based on the edge of the_slab, like the beam design.

1. In the case of a fixed / continuous_slab, the maximum share

RCC One Way Slab Design

2. In the case of partial continuous rcc slab.

a. Shear force at an isolated edge, V=0.4W

b. Shear force at the breaking end, V=0.6W

  • Step 3: Maximum Bending Moment

The maximum bending moment (M) is determined by the beam design, depending on the prevailing conditions.

i. When the beam is generally installed,




ii. If completely uninterrupted,


iii. If partially uninterrupted,

 

  • Step 4: Depth of RCC One Way Slab,

Effective depth of one way slab,


Here,




      M = maximum bending moment.

      b = Considered strip width =1m=100cm

     

     


Total Depth, t = Functional Depth + (Rod Dia. / 2) + Free Covering.

Slab free covering covering 2 cm and cover center from the center of the rod is 2.5 cm.

[Note: The total depth value will not be more than the approved depth in step-1.]

  • Step 5: Area of Tensile Reinforcement

Reinforcement amount for one meter strip,




Distance from the center of the rod to the center,

,

Where b = 100 cm.

Here, as= the area of a rod of fixed size will not be more than 3 multiply or 45cm thick in the maximum width of the main rod.

 

One Way Slab Design
fig-2: RCC One Way_Slab Reinforcement Detailing




  • Step 6: Shear Stress

i. Support is the maximum shear oppression 

[Here, V= Support Shearer Force ]

ii. Shear Stress from D distance at support,

Concrete receptive shear stress

  • Step 7: Bond Stress

The value of bond stress, 

   [Here, V = Max Share Force]

 
∑o  = The sum of the main rod ranges used in every meter.

= NπD   [N=, the number of main rods]

Approval able bond oppression:

i. Top bar case,

and Maximum 24.6 kg/cm2

ii. For other times except the top bar,

and Maximum 35.2 kg/cm2

[Here, D= the main rod diameter]

The amount of bond stress in the plain bar will be half of the deform bar.

  • Step-8: Area of Shrinkage Temperature Steel
  1. For Deformed Bar, A’s= 0.002 bt
  2. For Plain Bar, A’s= 0.0025 bt

Here, b = 1m = 100 cm

t = Total Thickness of_Slab

Distance of Temperature Bar,







Here, as = The Area of the cross section of a temperature bar, According to the ACI code, maximum distance of temperature bar is 5 multiple by_slab thickness or not more than 45 cm.

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