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Question

For the section of the beam shown in the given
figure, span of the beam = 6.0 m, concrete = M 20, steel = Fe 415.



If the section is checked for serviceability limit state
of deflection, then it wiil be found that

A
the section is unsafe
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B
the section needs revision
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C
the section is safe
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D
it cannot be judged from the given data
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Solution

The correct option is D it cannot be judged from the given data
The final deflection is limited to span/250 or 20 mm whichever is less.
So limiting deflection = 17 .1 mm
Dead load of beam
=(0.15×1.25+0.25×0.2)×25=5.94kN/m
The live load is also needed to calculate short term deflection. Therefore it can not be judged from the given data.

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