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Flexural Design of a Singly Reinforced Concrete Beam

Estimate b and h

h = 8% to 10% of beam span

b = 0.5h

Check for minimum thickness

using CSA A23.3 Table 9.2

Calculate beam weight

Calculate

Estimate d

Calculate As and select rebars

Method 1: Exact solution Method 2: CSA A23.3 Tables

Select using Table 2.1

Method 3: Iterative solution

Continue until the difference between two

consecutive As becomes less than 5%.

Calculate the actual effective depth, d

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Flexural Design of a Singly Reinforced Concrete Beam

Check #1:

If fs = fy?

CSA A23.3 Cl. 10.5.2

The steel does not yield.

Either increase the sectional dimensions

or use stronger materials.

if not possible, the section should be

designed as a doubly reinforced beam.

Yes

No

Check #2:

Minimum steel requirement.

or

Yes No

YesNo

Check #3:

Spacing check.

CSA A23.3 - 05

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Flexural Design of a Singly Reinforced Concrete Beam

Check #5:

Skin Reinforcement check. CSA A23.3 05 - Table 2-8.

Check #4:

Crack Control Parameter. CSA A23.3 05, Table 2-7.

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Flexural Design of a Singly Reinforced Concrete Beam

Check #6:

Strength requirement.

Yes

Design OK.

Design should be revised.

Sketch the beam.