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Question
Partial safety factors of _____ are used to check limit state of serviceability. 
A.
0.8 for both dead and live loads
B.
1.0 for dead load and 0.8 for live load
C.
0.8 for dead load and 1.0 for live load
D.
1.0 for both dead and live loads
Answer ( Option D)

1.0 for both dead and live loads

Solution

Partial safety factors : (ϒf)
Combination Limit state of serviceability
DL LL WL/EL
DL + LL 1 1 -
DL+LL+WL/EL 1 0.8 0.8
DL+WL/EL 1 - 1
 
Combination Limit state of strength
DL LL WL/EL
DL + LL 1.5 1.5 -
DL+LL+WL/EL 1.2 1.2 1.2
DL+WL/EL 1.5(0.9)* - 1.5
*  This value is to be considered when stability against overturning or stress reversal is critical.
 

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