Q) Differentiate between singly reinforced beam and doubly reinforced beam.

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Q) Differentiate between singly reinforced beam and doubly 

reinforced beam




Aspect

Singly Reinforced Section

Doubly Reinforced Section

Definition

Has reinforcement only in the tension zone.

Has reinforcement in both tension and compression zones.

Moment Resistance

Designed to resist only the moment that tension steel can handle.

Designed to resist higher moments than singly reinforced can bear.

Usage

Used when the section depth is sufficient and moment demand is moderate.

Used when section depth is restricted or higher moment capacity is needed.

Steel Placement

Tension steel only (at the bottom in beams).

Tension steel at bottom and compression steel at top.

Ductility

Less ductile.

More ductile due to compression reinforcement.

Cost

Economical.

Costlier due to extra steel.

Common Application

Simple beams and slabs.

Columns, heavily loaded beams, or architectural constraints.


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