How to use AISC Table 3-6? Why the unit is Kips for Uniform Load?

[Cary Yue]

Hi,

I am paparing for the exam. How to use AISC Table 3-6? Why the unit is Kips for Uniform Load? If I known the beam span and size, can I use table 3-6 to know the Maximum uniform live can resist by the beam?

Thanks,

 

[drawoh]

A kip is one thousand pounds. This is a convenient way to express loads in English units.

--
JHG

 

[BrianE22]

I'd think "uniform" would be loads/distance (like kips per foot)

 

[BulbTheBuilder]

Note this, AISC table 3-6 is maximum total uniform (kips) load for a braced (Lb=<Lp) simply-supported spans bent about the strong axis (Ix).

To get the kip/ft you have to divide the load maximum total uniform(kips) by the span of your beam (span,ft). The moment capacity (plastics) are also at the bottom of your table --> beam properties

Example, assume W44x355. If you beam is braced(Lp) at 12.3ft or less you can proceed to use this table. For a 21ft span, my beam can support = 2310/21=110kip/ft(LRFD) [1540/21=73.333kip/ft (ASD)]
For a 32ft span, my beam can support = 1520/32=47.5kip/ft(LRFD) [1010/32=31.5625kip/ft (ASD)].

Both beams have the same moment capacity per the table.

For 21' ---> wl^2/8 = 110*21^2/8=6063.75kip-ft
For 32' ---> wl^2/8 = 47.5*32^2/8=6068kip-ft

 

[dik]

Something like:

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/raw/upload/v1706654868/tips/Maximum_Reactions_AISC_tegp4a.xlsm[/url]

Copy and past lines 25 to 70 and rename beam number...

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[Cary Yue]

Thank you all, I got it！

 

[BulbTheBuilder]

You're welcome! All the best with your exams