Discussion
Which of the following is a load combination IS 1893 requires for limit state design with earthquake?
Answer: A
The set required is \( 1.5(DL + IL) \), \( 1.2(DL + IL \pm EL) \), \( 1.5(DL \pm EL) \) and \( 0.9DL \pm 1.5EL \). The reduced factor on gravity in the combinations with earthquake acknowledges that the two are unlikely to peak together, and the last case covers uplift where dead load relieves rather than adds.
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