the applicable scope of AISC DG04 and DG16 3

[TTTKAO]

Hello

May i ask some advices or previous project experiences regarding to the difference of AISC DG04 extended end-plate moment connections and DG16 flush and extended multiple-row moment end -plate connections?

1. what's the scope of these two design guide? seems DG04 is for high seismic load design connection. if there is structure with R=2.5 following AISC 341, Can I follow DG16 ?
2. if i am using DG16 to perform the design. do I need follow welding procedure shown on DG04 chapter 2.4 as this is recommended for low seismic and wind controlled applications in this chapter ?

Thank you for sharing what you practiced in your project in advance.

 

[JoshPlumSE]

Some background:

1) The first addition of DG04 used a totally different design procedure for their bolted end plate connections. While this was pre-Northridge, it was intended for wind and seismic connections. I used it all the time in the late 1990's for petrochemical work. Construction sites so contaminated that even the ground is flammable (maybe a slight exaggeration). Regardless, for those sites (and the petrochem industry) there is ZERO field welding allowed.

2) DG 16 came out more geared towards the metal building industry. It was great in that it covered all kinds of flush end plates and such that were not previously covered. And, the yield line theory made for more efficient connections. It was something of a game changer, but they had not done sufficient research on SEISMIC issues to justify it's use. Therefore, we had two different connection methods for some of the same connections depending on how they were used (seismic vs non-seismic).

3) Eventually, a 2nd edition of DG4 was released that updated the methods of DG16 to be applicable to the high seismic connections of DG4.


Sorry for the info dump. But, I feel like it's important to understand why AISC now has two design guides that essentially cover the same kind of connection.


To answer your question, if you are using a seismic connection that complies with AISC 341 as a Special or Intermediate Moment Frame connection, then it needs to follow the procedures of DG04. And, probably the additional details of the connection AISC 358.

If it's an Ordinary Moment frame, I'd have to think about it. I'd prefer to stick with the DG04 stuff. But, off the top of my head, I'm not sure it's explicitly required.

For a R = 2.5 connection, I don't think you're relying on almost any ductility, so you could probably ignore DG 4 in it's entirety.

 

[TTTKAO]

Hi JoshPlumSE,

Thank you for such a clear explanation specially for me who started to use US code recently. Appreciate it so much!

Regards!