Tapered Section Capacity Check (AISC Code)

[Anonymous]

Good evening. I'm currently designing an industrial warehouse using Moment Resisting Frames with columns and beams that haver Tapered Sections (I/E variable web height). When i try to execute the capacity check for the members the following message pops up:

I know the AISC code pretty well and I do believe there is no such thing as an Appendix F3, nor any A-F3-1. Could someone tell me where can i find this requirement?

[Artur.Kosakowski · Accepted solution]

The reference is to LRFD 2000 from 27 Dec 1999

My understanding is that ANSI?AISC does not provide any guidance for capacity of tapered sections against bending. In such situation Robot uses the provisions from LRDF instead.

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[Anonymous]

Right... You do realize that code is from 14 years ago and is no longer valid. The AISC does provide some guidance to design such members on their Design Guide # 25, I thought that was the refference the program took to evaluate the capacity.

I really think Robot must get updated to the latest specifications, its really annoying that you have to calculate member capacities by hand or via a spreadsheet when the program should calculate them. You guys should consider these issues on future versions of Robot or on a service pack update.

Anyways thank you for your assistance, you solved my questioning.

Regards,

Ivan Franco