Why must compression reinforcement in a doubly reinforced beam be enclosed by stirrups?
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A.
To reduce the amount of steel required in compression
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B.
To increase the slenderness ratio of the beam
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C.
To prevent buckling and improve ductility by confining the concrete
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D.
To provide additional strength to the tension reinforcement
Correct Answer:
C. To prevent buckling and improve ductility by confining the concrete
Explanation:
The correct answer is to prevent buckling and improve ductility by confining the concrete.
In a doubly reinforced beam, the compression reinforcement is susceptible to buckling under high stress because of its slender nature. By enclosing these bars with stirrups or lateral ties, the beam provides essential lateral support that prevents the steel from bowing outward. Furthermore, this confinement enhances the ductility of the concrete in the compression zone, allowing the beam to undergo larger deformations before failure and improving its overall structural integrity.
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