# Reinforced Concrete Beam Module - Calculation of Beam Size Calculation of Beam Size

## How do you calculate beam size?

2. Open this sheet in MS Excel software.
3. Insert design data, beam data and reinforcement data.
4. Then click 'RUN ANALYSIS" and see the beam size result.

#### Default Design Data:

Design Moment, M = 18 KN-m
Design Shear at Support (for stirrups calculation), V = 87 KN.
Effective Length of Beam (for stirrups calculation), L = 5 m.
Reinforcing Bar Yield Strength, fy = 275 MPa.
Concrete Compressive Strength, fc' = 20.7 MPa.

#### Beam Data:

Depth of Beam, h = 250 mm
Width of Beam, b = 200 mm
Clear Covering, c = 38 mm

#### Steel Reinforcement data:

Number of layers for tensile bars (max=2 layers) NLay = 1 layer(s).

• First layer bars
Number of Reinforce Bars (1) N = 2 pc(s).
Bar (1) Size dia = 16 mm.
The number of Reinforce Bars (2) N = 0 number error.
Bar (2) Size dia = 0 number error.

• Second layer bars
The number of Reinforce Bars N = 0 number error.
Bar Size dia = 0 number error.

• Compressive bars
The number of Reinforce Bars(one layer only) 2 pc(s).
Bar size dia = 16 mm.
Stirrup Bar Diameter dia = 10 mm. Result of Beam Design Beam Design in Excel Spreadsheet

### DESIGN NOTES:

• Minimum Cover for cast in place concrete as recommended by ACI
• Beams/Columns - 40 mm
• Slab/Wall/Joist - 20 mm-40mm (depending on bars sizes)
• If exposed to weather, Beams/Columns - 40mm-50mm
• Slab with beams on four edges - 90mm
Download free excel spreadsheet here: Calculation of Beam Size Excel Spreadsheet. You can also free download Foundation Desing Excel Sheet on this website. For any question, white in the comment box, Thank you.