Under which one of the following condition the doubly reinforced beam are recommended?

Explanation: Doubly Reinforced Beam Section: (i) Doubly reinforced beam sections are usually provided where there are restrictions in the beam depth and breadth due to architectural consideration or other restrictions like availability of headroom etc.

When can we design a beam as doubly reinforced?

Doubly reinforced beams are designed if such beams of restricted depth are required to resist moment more that its Mu, lim. Q. 2: Name three situations other than doubly reinforced beams, where the compression reinforcement is provided.

How do you know if a beam is doubly reinforced?

In a beam, If the reinforcement is only in tension zone then it is called Singly Reinforcement Beam and if the reinforcement is both at Tension and Compression zone then it is called Doubly reinforced Beam. In both case, there will be rod in tension and compression zone.

In which situation doubly reinforced beam is used?

Doubly reinforced sections are used in the following conditions: When the dimensions (b x d) of the beam are restricted due to any constraints like availability of head room, architectural or space considerations and the moment of resistance of singly reinforced section is less than the external moment.

Why do we go for doubly reinforced beam?

Doubly reinforced beam is provided to increase the moment of resistance of a beam having limited dimensions. Minimum compression reinforcement is provided to hold the Shear Reinforcement (stirrups) in position and for increasing the ductility of beam.

What is doubly reinforced section?

The additional moment of resistance is carried by providing compression reinforcement and additional reinforcement in tension zone. Therefore the section which is reinforced with longitudinal reinforcement in both tension and compression zone is known as doubly reinforced section.

What is a doubly reinforced beam on what factors Its design will depend?

Beams reinforced with steel in compression and tension zones are called doubly reinforced beams. This type of beam will be found necessary when due to head room consideration or architectural consideration the depth of the beam is restricted.

What is singly reinforced beam and doubly reinforced beam when we use doubly reinforced beam?

A Singly reinforced beam holds a steel bar in the tension zone, but in doubly reinforced beams, steel bars are given in both zones, tension, and compression. In singly reinforced beam compression, stress resists by the concrete, while in doubly reinforced beam compression steel, counters the compression stress.

Why doubly reinforced beam is preferred over singly reinforced beam?

If a beam with limited depth is reinforced only on the tension side, it may not be strong enough to withstand the bending moment. In order to increase the load capacity of the section moment. A doubly reinforced beam is provided to increase the strength of a beam with limited dimensions.

Why is doubly reinforced beam less economical than singly reinforced beam?

A doubdly reinforced beam is considered less economical than a singly reinforced beam because. tensile steel required is more than that for a balanced section.

Why doubly reinforced beam are preferred over singly reinforced beam?

Advantages of Doubly Reinforced Beam. Compression steel helps in reducing the beam’s long-term deflection. The doubly reinforced beam is economical as contrasted to singly reinforced beams. The doubly reinforced beam has steel in tension and compression zone to reduce the section’s deflection.