Studying standard beam reinforcement drawings

In this exclusive civil?engineering?video tutorial, you will learn how to read different types of standard reinforcement drawings for?beam.

Reinforcement detailing in beams

1. Beam?bears transverse exterior loads that produce bending moment, shear forces and in some cases torsion
2. Concrete?has good strength in compression and poor strength against tension.
3. Steel reinforcement resist tensile stresses in reinforced?concrete?beams.
4. Mild steel bars or Deformed or High yield strength deformed bars (HYSD) are normally used.
5. HYSD bars contains ribs on the surface and it raises the bond strength minimum 40%.

Given below, some vital notes for studying beam reinforcement drawing :-

Properly, study the general notes sheet of structural drawing. The data given below, should be acquired from general notes about?beam?reinforcement.

• Lap length
• Bend length
• Clear cover

Lap length

Beam mainly contains two types of longitudinal reinforcing bars like top longitudinal bar and bottom longitudinal bar.

When the length of a longitudinal bar surpasses the full length of reinforcing bar then another reinforcing bar is arranged by overlaying with existing one. The length of overlapping is known as lap length. The lap length for several diameter bar is demonstrated in the general notes sheet of structural drawing.

The lap length varied for top and bottom longitudinal bar of beam.

Obtain lap length details for several diameter of top and bottom longitudinal bar of the beam.

Bend Length

It is known that all longitudinal bars of beam are bent at the end of the bar. The length of bend is decided by the suggestions of structural engineer in the general note sheet of structural drawing.

Verify if any instruction exists in the general note sheet about the bend length.

If there is no instruction, a general formula can be applied for 90° bend with adherence to ACI code i.e 12db. Here "db" means the diameter of bar.

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