# Type of Problems in Doubly R.C. Beam | Civil Experience

In Doubly R.C. Beam Section There are two types of problem 1. Analysis of section 2. Design of section Derivation Formula

In Doubly R.C. Beam Section There are two types of problem

1. Analysis of section
2. Design of section

## Derivation of problem solving Formula

### 1. Analysis of section

Suppose
Cross-section of beam and steel are given
Depth of N.A. ( Xu ) and Mu are to be calculated

#### To find Xu

 Stress Dia of Doubly R.C. BeamFig. from Atul Prakashan book
b = width of beam
d = effective depth
d' = eff. cover to compression steel
D = overall depth
Xu = depth of N.A. ( natural axis )
Ast1 = Area of tension reinforcement required for balanced singly R.C. beam
Ast2 = Area of additional tension reinforcement
Ast = Ast1 + Ast2
= Area of total compression reinforcement
fsc = stress in compression reinforcement
fcc = comp. stress in concrete at the level of comp. steel

 To find XuFig. from Atul Prakashan book

#### To find Mu

 To find MuFig. from Atul Prakashan book

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