Question

The factored loads at the limit state of collapse for DL + LL + WL combinations, according to IS : 456 - 1978 are respectively.

• A. 1.5 DL + 1.5 LL, 1.2 DL + 1.2 WL, 1.5 DL + 1.5 LL + 1.5 WL
• B. (0.9 or 1.5) DL + 1.5 LL, 1.5 DL + 1.5 WL, 1.2 DL + 1.2 LL + 1.2 WL
• C. 1.2 DL + 1.2 LL, 1.5 DL + 1.5 WL, 1.5 DL + 1.5 LL + 1.5 WL
• D. 1.5 DL + 1.5 LL, (0.9 or 1.5) DL + 1.5 WL, 1.2 DL + 1.2 LL + 1.2 WL

Answer 1

The correct option is D 1.5 DL + 1.5 LL, (0.9 or 1.5) DL + 1.5 WL, 1.2 DL + 1.2 LL + 1.2 WL

S.No	Description	Collapse	Serviceability
1	D.L + L.L	1.5	1
2	D.L + (W.L) or (E.L) combination
	(i) For normal case D.L + W.L (or E.L)	1.5	1
	(ii) For checking stability against overturning/stress reversal D.L + W.L (or E.L)	0.9	1
3	(D.L) + L.L + W.L (or E.L)combination
	D.L	1.2	1
	L.L	1.2	0.8
	W.L (or E.L)	1.2	0.8