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why is the deflection of concrete beams determined for total service load and live loads?

why is the deflection of concrete beams determined for total service load and live loads?
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*design of beam is complex as its has to carry the load safely which is coming over it. it also includes the self weight of the beam apart from service load and live loads.

If the beam deflects in excess this causes visual distress to the users and it damages the other parts of the building.

we cannot compromise the load coming on the beam. Beam need to be designed for all the possible load that might act on it.

if the load considered is less for the design than the actual design, if excess load acts on it than it could cause delection of the beam and leads to failure.

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