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Design of One Way slab Part-1: Determining Effective Depth in One-Way Slab

 To design a one way slab first of all we need to check whether it’s supported on all sides and second whether it’s aspect ratio is more than two or not. So, if any slab is not supported on all sides then we don’t need to check for the second condition. It is simply  a one way slab. But if it is supported on all sides then we need to check what is it’s aspect ratio. Now the major question is, what is the aspect ratio. 

Aspect ratio= Longer Span/Shorter Span .

If the aspect ratio is greater than two then it is a one-way slab, otherwise it’s a two way slab. 

Now our next step will be calculating the effective depth. Then again we need to know what is effective depth. 

So, Effective depth= Overall depth - half of diameter of main reinforcement - clear cover. 

 To calculate the effective depth we have a formula.

l/d < k1.k2.k3.k4 X Basic value

Now the question is what are these values!

So here,

l denotes the length of shorter span  

K1 = depends on whether span is above 10 m or not.

K2 = depends on % of tension steel 

K3 = depends on % of compression steel

K4 = depends on ratio of web width and flange width

Basic Value = depends on type of support

To know the values of all these you can refer Clause 23.2.1 of IS 456


Once you have all these values you can assume the value of effective and overall depth.


To have a deeper understanding of this concept you can visit : https://youtu.be/Q5ROilapCls 







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