What Is Singly Beam?
A singly beam is the beam which is provided with longitudinal reinforcement in the tension zone. Compressive forces are handled by the concrete section in the beam.
What Is Doubly Beam?
The beams reinforced with steel in compression and tension zones are known as doubly reinforced beams. This kind of beam will be found essential when headroom consideration or architectural concern the depth of the beam is restricted.
The beam with its restricted depth, if reinforced provided on the tension side only, it may not have sufficient moment of resistance to resist the bending moment.
By raising the quantity of steel in the tension zone, the moment of resistance cannot be increased indefinitely. Generally, the moment of resistance can be increased by not more than 25% beyond the balance moment of resistance by making the beam reinforced on the tension face.
Hence, to additional increase, the moment of resistance of a beam section of unlimited dimensions, a doubly reinforced beam is provided.
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