BEAM CAPACITIES for A36 (13th AISC)

[bong1969]

Hello,

i just browsed a 13th edition AISC manual. it seemed that there were no values for A36 on beam allowable loads. Thanks for the reply.

 

[BAretired]

Is anyone using A36 nowadays? Even if you are, do not the principles set out in the code provide sufficient guidance to determine the capacity of a beam?

BA

 

[frv]

135 k-ft.

 

[BAretired]

That sounds like an answer... whether or not it is a good answer reamains to be seen.

BA

 

[msquared48]

I thought the answer was A: 36 KFT.

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[WillisV]

Beams are generally no longer produced to A36. In many instances there is actually an upcharge to do so. A992 GR50 is the standard for rolled beams.

 

[ToadJones]

just another reason AISC should have never moved past the Green Book....

 

[Den32]

Agreed - it appears that AISC 13th Edition no longer has 36 ksi values in Allowable Load Tables or Beam Charts. Yes, new W-shape beam should be spec'd as 50 ksi steel since that is what is available.

If you need to check for 36 ksi, you can use the formulae in AISC Spec to determine capacities, or if you are checking an existing beam, go back to the Green book (for ASD) or Silver/Blue book (for LRFD).

 

[bong1969]

thanks

 

[IFRs]

Some codes require the use of A36. AWWA D-100 (water tanks) latest edition is on example: "Roof rafters designed using a live load of 50 psf or less must be designed using allowable stress for A36 material, regardless of the material used." So, don't throw away your old editions!