Column Strengthening for canopy structure

[civeng80]

I need to cantilever a canopy about 4m long from the end of a portal frame building and this would then be off a column (460UB 57) in the weak axis direction. Anyone have any ideas how to strengthen the column to take the moment due to the cantilever?

Thanks!

 

[Lion06]

Is there a frame in the weak direction or the strong direction only?
You could weld a plate from flange to flange on both sides creating a box shape.

 

[parrot77]

or you could place a beam behind the cantilever beam spanning across the end bay between the end and second from end portal columns. Considering the lack of stiffness of the portal about its weak axis, most of the moment would be transfered into this member.

 

[apsix]

I would explore parrot77's idea.
Perhaps a big channel fixed to the outside flange of the 2 last portal columns.

 

[civeng80]

Thanks parrot77 and apsix thats what I have in mind doing. Just one little problem though, there is a stiffener between the flanges on the column where the main rafter joins on the column so Im wondering how I can pass the beam thru the stiffener or maybe cut the stiffener off then trim it around the welded beam. I know its a minor detail but its annoying me.

Thanks!

 

[civeng80]

Thanks all

Just remove stiffener and reweld a trimmed atiffener would do it.

 

[csd72]

Why not just us a channel either side bolted to the faces of the columns following parrot77s idea. Minimum site work.

Another idea is to use an L shaped frame which would resolve the reaction into a horizontal push and pull which is easier to handle.

 

[civeng80]

csd72

Not really following your idea! Could you elaborate more. I will post a drawing of the situation if you like>

 

[civeng80]

csd72

A hit and run case.

 

[apsix]

My interpretation of CSD's 2 options attached

 

[civeng80]

Many thanks apsix

Yes may work, I was thinking in tunnel vision just about strengthening column.