Question

For avoiding the limit state of collapse, the safety of RC structures is checked for appropriate combination of Dead Load(DL), Imposed Load or Live Load (LL), Wind Load(WL) and Earthquake Load(EL). Which of the following load combinations is not considered?

• A. 0.9 DL + 1.5 WL
• B. 1.5 DL + 1.5 WL
• C. 1.5 DL + 1.5 WL+1.5 EL
• D. 1.2 DL + 1.2 LL +1.2 WL

Answer 1

The correct option is C 1.5 DL + 1.5 WL+1.5 EL

Various load combinations according to IS : 456 - 2000 are

1. 1.5 DL + 1.5 LL
2. (a) 1.5 DL + 1.5 (WL or EL)

(b) 0.9 DL+ 1.5(WL or EL) - when stability against overturning is critical
(c) 1.2 DL + 1.2 LL + 1.2 WL/EL