Hollow-Core Plank - Welding Along Length
Hollow-Core Plank - Welding Along Length
(OP)
I have a project with hollow-core planks bearing on structural steel framing. 8" hollow-core with 2" normal weight topping. I have specified the planks must be supplied with embedded plates to allow for welding to the top flange of the steel beams. I'm requiring this where the planks bear on the steel and also when the plank is parallel to the beam span. The plank manufacturer is stating they "do not recommend welding along the length of the plank because it does not allow for vertical movement due to volumetric changes, and may result in cracking."
I have not seen this in the past. Does anyone have experience with this condition? I need the planks to brace the top flange, and I thought this was the standard method.
I have not seen this in the past. Does anyone have experience with this condition? I need the planks to brace the top flange, and I thought this was the standard method.






RE: Hollow-Core Plank - Welding Along Length
2) For planks running parallel to your beam, the trick is probably to decouple axial movement in the plank from axial restraint provided by the beam. For beam bracing, perhaps you could used pairs of clip angle guides along the beam that are welded to the precast but not attached positively to the beam. That'll give you some beam bracing without the plank restraint.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Hollow-Core Plank - Welding Along Length
RE: Hollow-Core Plank - Welding Along Length
I specified that shim plates be added as needed to fill the gap due to camber.
KootK: The angles are a good idea. I'm not sure I'm comfortable with there not being a connection between the beam flange and angles. I suppose it still provides the bracing as long as the angles are installed directly against the flange on each side.
RE: Hollow-Core Plank - Welding Along Length
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Hollow-Core Plank - Welding Along Length
Another question for this condition: I have an interior braced frame that is parallel to the plank span. I planned on transferring the diaphragm forces with the embedded plates (4' o.c.). If I eliminate the embedded plates, I'm thinking my only option would be to have the hollow-core manufacturer leave a gap between planks at the steel beam so I could use welded studs. They would then obviously grout to fill the gap. Anyone have any alternatives to this?
RE: Hollow-Core Plank - Welding Along Length