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Question
According to IS 456, simply supported beam of effective depth, d and breadth, b shall be so proportioned that the clear distance between the lateral restraints does not exceed
A.
60b or 250b2/d which is less
B.
25b or 100b2/d which is less
C.
60b or 100b2/d  which is less
D.
25b or 250b2/d  which is less
Answer ( Option A)

60b or 250b2/d which is less

Solution

According to the IS code 456 : 2000 clause 23.3. A simply supported or continuous beam

shall be so proportioned that clear distance between the lateral restraints does not

exceed

60 b or 250 b2/d whichever is less

Where, d= effective depth of the beam

b= breath of the compression face midway between the lateral restraints.

For cantilever beam; Clear distance between the free end of cantilever and lateral restrain

shall not exceed. 

25 b or 100b2/d whichever is less.

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