Difference between singly and doubly reinforced beam

1 When Mu < Mu lim, the beam is designed as singly R.C. beam 2 When Mu > Mu lim, the beam is designed as doubly R.C. beam 3 It’s M.R. is less 4...

Singly Reinforced vs Doubly Reinforced Beam

Singly R.C. beam

Doubly R.C. beam


Singly R.C. beam

Doubly R.C. beam
Ast = Area of steel in tension zone
Asc = Area of steel in compression zone

In the tension zone, Ast is provided

In the tension zone, Ast is provided

 

In the compression zone, Acs is provided

In the compression zone, 2 – 10 Φ anchor bars are provided. The anchor bars are not designed to carry any compressive force

In the compression zone, Asc is provided to resist compressive force

When Mu < Mu lim, the beam is designed as singly R.C. beam

When Mu > Mu lim, the beam is designed as doubly R.C. beam

It’s M.R. is less

It’s M.R. is more

Ductility is less

Ductility is more due to Asc in the compression zone

Not suitable where there are chances of a reversal of stresses

Suitable where there are chances of a reversal of stress ( for example During earth quack )


For the what is a beam, reinforced beam, Doubly beam and Necessity of Doubly Reinforced Section 
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