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NCEES 2008 problem #501


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#1 PEin2010

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Posted 27 October 2010 - 09:24 PM

Why is the answer 63 kips (ASD) / 94 (LRFD) and not 125 kips (ASD) / 187 (LRFD)???

When to use the maximum uniform load given by the table and when to use the Vn/ factor of safety (the value given at the bottom of the column on pg. 3-74 / AISC manual)???

Thank you!

#2 MTeeden

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Posted 27 October 2010 - 10:15 PM

QUOTE (PEin2010 @ Oct 27 2010, 05:24 PM) <{POST_SNAPBACK}>
Why is the answer 63 kips (ASD) / 94 (LRFD) and not 125 kips (ASD) / 187 (LRFD)???

When to use the maximum uniform load given by the table and when to use the Vn/ factor of safety (the value given at the bottom of the column on pg. 3-74 / AISC manual)???

Thank you!



Don't have the question in front of me, but I'm pretty sure that shear failure governs in that case. Max shear is 94 kips

#3 dastuff

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Posted 28 October 2010 - 04:55 PM

I bet this ties into your other question and you should be dividing by two wink.gif

#4 wow

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Posted 26 October 2011 - 01:54 PM

If the load were fixed at the center, then you would multiply the allowable shear load by 2. But this is a MOVING load, so if the load were placed nearest to one of the ends, then shear governs (62.5 k) as the allowable shear force would equal the applied load.



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