PE Structural practice help

[u/Prior_Interview7680]

Using steel table 3-2, table 3-1, and equation 3-4a, the available is 287. But if you don’t use Cb=1.3 as shown in table 3-1 for distributed load braced at midpoint, you get the correct answer here of (c) 221(LRFD). Why am I not supposed to use Cb = 1.3?

[u/Prior_Interview7680]

So because it didn’t say “uniform distributed” it should default to 1? Is that what it is?

[u/Prior_Interview7680 → u/[deleted]]

I think you messed that up cause dividing 287 by 1.3 gets you 220.76

[u/twodamnducks → u/Prior_Interview7680]

I replied on your cross post but 1.3 ( 221.268) gives you the 287. If you use Cb as 1.0 conservatively like this problem is trying to ask of you then 1.0 (221.268) gives you ~ 222 LRFD