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Structural Design Specifications

Q1: If the ratio of effective span to overall depth of a simply supported beam is equal or greater than 1 but less than or equal to 2, the lever arm, is

A 0.2 (l + 2D)

B 0.3 (l + 3D)

C 0.2 (l + 3D)

D 0.3 (l + 2D)

ANS:A - 0.2 (l + 2D)

For deep beams;

In case of simply supported beam;

Lever arm=0.2(1+2D) for 1<l/d <2.
0.61 for l/d<1.

In case of continuous beam;

Lever arm = 0.2(1+1.5D) for 1 < l/d <2.5.
0.51 for l/d <1.



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