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Question
A doubly reinforced beam is considered less economical than a singly reinforced beam because
A doubly reinforced beam is considered less economical than a singly reinforced beam because
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Solution
The correct option is D compressive steel is under-stressed
(d)
The doubly reinforced beam section is needed
(i) when depth of the section is restricted and the strength available from a singly reinforced section is inadequate
(ii) at support of a continuous beam or slab where bending moment changes sign.
(iii) when members are subjected to alternate external loads and the bending moment in the sections reverses such as in concrete piles etc.
(iv) when the members are subjected to loading eccentric to either side of the axis, such as in columns subjected to wind loads.
(v) when the members are subjected to accidental lateral loads, shock or impact.
(d)
The doubly reinforced beam section is needed
(i) when depth of the section is restricted and the strength available from a singly reinforced section is inadequate
(ii) at support of a continuous beam or slab where bending moment changes sign.
(iii) when members are subjected to alternate external loads and the bending moment in the sections reverses such as in concrete piles etc.
(iv) when the members are subjected to loading eccentric to either side of the axis, such as in columns subjected to wind loads.
(v) when the members are subjected to accidental lateral loads, shock or impact.
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