Seated Connection Design

[ooox]

I am designing a seated connection plate to support a contunuous beam that will experience a large bending moments over the width of the support. Does anyone have any examples of the required checks for this type of support or provide any advice?

Cheers,
999

 

[ooox]

With attachment...

 

[dhengr]

I’d check the C for web crippling, applying about 60 - 70% of the total reaction (you pick), a function of unbalanced loading potential, C rotation over the reaction, etc., apply this over one of the vert. stiffeners you show. I trust you are going to bolt the C web to the col. flgs. Then ask yourself how the reaction load is really transmitted from the C to your seat connection. And, then maybe you replace your expensive seat detail with a 3/4 or 1" x (col. flg. width, less 2") x however high piece of pl. so you can get two vert welds to carry the reactions. Don’t forget to brace that torsionally unstable C section.

 

[rowingengineer]

agree with dhengr, the two stifffners are a was of time and would require the flange of the UB to be braced, if the load are high.


An expert is a man who has made all the mistakes which can be made in a very narrow field

 

[dhengr]

999>> Can I please steal your thread for a moment?

rowing>> Did you just have a thread, on Pat’s Pub, vaporized by the powers-that-be, about a week ago? You wondered (as I recall) if anyone had any ideas for improving the functioning and improving the interaction btwn. participants on any given thread. Since you and I don’t manage or have any control over this forum, I assumed you were not talking about this forum, but I thought you had started a thread that could have benefitted all, and I was sorry to see it disappear so quickly.

 

[rowingengineer]

Dhengr,
Yes I did have a thread, and yes it was vaporized, however the ideas with-in were received by the powers. They seemed to take them on board.

An expert is a man who has made all the mistakes which can be made in a very narrow field

 

[dhengr]

Rowning>> Did they indicate that they would entertain any other ideas, or do they tend to resist that kind of rebellious activity? And, thus vaporize it quickly. And, should I cease and desist before I get vaporized too. I think I remember your first item, ‘new members should wait a few days and see how things work here, before posting the first time. I remember that there were a few more posts, and I thought it had the potential of being a meaningful thread. I started my list, and when I went back it was gone. Did you actually have some favorable communication with them and/or do they frown on these types of suggestions?

I’m fairly new at this forum thing, although much less new at engineering, since I have been running my own consulting engineering firm since 1977; and 10 years before that I left Grad School and had two jobs in the interim. I find this forum, the whole gamut, quite interesting: many times enlightening because of the range of questions and of how others look at the same issues; sometimes frustrating for the poorly thought out questions and lack of info. which might lead to a meaningful discussion; many times fairly time consuming because I just don’t have many quick answers (glib or quick & dirty) to complex problems. I think I could really enjoy picking a few young people here and mentoring them or working with them on a closer level, on their questions and problems. That would be far more meaningful to me than a hundred questions, all kinda quick and dirty, and then another question, and you never really hear about the final results or outcome.

 

[DaveAtkins]

nineninenine,

Why are you trying to transfer the moment into the column? Can't the moments on each side of the column be balanced?

DaveAtkins

 

[hokie66]

I don't understand what you mean by "there is a large bending moment over the width of the support". As the channel web is against the beam flange, why not just bolt them together?

 

[ash060]

I like hokie66's idea, the moment is in the channel not the column.

 

[asixth]

Are you trying to transfer moment into the column for lateral stability (i.e. creating a framed structure).

To transfer moment into the column you need to engage the flanges of the channel. A seated connection detailed the way you have it will not transfer moment into to the column.

When I first started out, I detailed seated connections because I felt it was a more positive bearing-type connections. For your design, I would detail 4-bolts thru the web of the channel fixing to the flange of the column and would not try transfer moment from the channel to the column.