Difference Between Single and Doubly Reinforced Beam
For a beam, it is necessary to provide reinforcement (steel bars) in the compression and tension zone.
In a beam, if the reinforcement is only in the stress zone, it will be called the Singly Reinforcement Beam, and if the reinforcement is in the Tension and Compression zone, it will be called the Doubly Reinforced Beam.
In both cases, there will be a rod in the tension and compression zone. This is because it is not possible to form a beam structure without stirrups.
To keep the stirrups in a standing position, it is necessary to place two reinforcements in the compression zone of the reinforced beam singly.
However, these two never carry or carry loads on your body, and it is only fictional.
In a beam, the upper section is called the compression zone, and the lower section is called the stress zone.
It is used when the section has to resist moment Rbd2. While it is used when the section has to resist a moment greater than the Rbd2.