question- studying for str i pe exam
 

question- studying for str i pe exam
i'm going to take the structural i exam in for the pe license. right know i'm starting to do the sample problems of the "ncees str i sample questions & solutions". in the solution to problem 105 i got stuck in the dlrm calculation. what is the basis?, what does dlrm mean and the 2/3 factor (where it came from?).
if anyone can help me, thank you in advance.
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most of us probably don't have the book - can you better describe the problem and what it asks?
my guess- dlrm is dead load resisting moment, and the 2/3 is reduction of dead load to get the f.s.=1.5 against overturn.