existing steel beam stiffener but no field welding

[AskTooMuch]

I have an existing W10 beam and will be bolting a new W steel column on top flange. I need to put stiffener on the existing W10 beam, what is a good detail if I can't field weld.

 

[msquared48]

Treat as a bearing stiffener with no weld to the bottom flange.

Mike McCann, PE, SE (WA)

 

[BridgeSmith]

If you can't weld it, bolt it. Plate bolted to an angle that is bolted to the web, or just an angle trimmed to fit and bolted to the web. Easy Peasy.

 

[AskTooMuch]

Web crippling and yielding is passing but I'm failing in web sideway buckling without stiffener. I can't picture in my head how stiffener helps with that. Beam length (Lb) is 20'. How is stiffener helping prevent the sideway buckling of 20' length web.

 

[Ron247]

When you said stiffener, I assumed Web stiffener. Sounds like you need something like a plate or cap channel type solution for the length of the beam. Can you bolt a plate or cap channel on the flange? Is only the top flange in compression or do you have buckling issues with the bottom flange also.

 

[AskTooMuch]

Yes, I meant web stiffener. Local web yielding, web crippling and sidesway web buckling.

 

[dauwerda]

Sidesway web buckling can happen if the compression flange is laterally braced and the tension flange is not (see image below). It cannot occur if the compression flange is restrained from rotating. Bolting (sufficient sized) angles on each side of the web as suggested above will prevent this. The installation relies on bearing between the angle legs and the flange, so they would need to be installed with a snug fit to ensure rotation is prevented.

 

[dauwerda]

If your top compression flange is not braced, you probably have a lateral torsional buckling issue, not a sidesway web buckling issue. In which case a web stiffener will not help.

 

[KootK]

Is the column web parallel to the beam web or perpendicular to it?

 

[KootK]

And what size and weight are both of your members?