Question

What is the partial safety factor for dead load when it contributes to the stability of the structure against overturning?
1. 1
2. 1.5
3. 1.2
4. 0.9

Answer 1

Correct Answer - Option 4 : 0.9

Concept: -

As per IS 456:2000, Table 18 – Values of partial factor of safety for loads –

Load Combination	Limit State of collapse			Limit state of serviceability
	DL	LL	WL / EL	DL	LL	WL / EL
DL + LL	1.5	1.5	-	1.0	1.0	-
DL + WL / EL	1.5 or 0.9*	-	1.5	1.0	-	1.0
DL + LL + WL / EL	1.2	1.2	1.2	1.0	0.8	0.8

* This value is to be considered when stability against overturning or stress reversal is critical.

Hence,

The value of partial factor of safety for dead load when stability against overturning = 0.90.