Design of Concrete Encased Beams
Design of Concrete Encased Beams
(OP)
I am about to begin a project on which the owner wants to encase existing steel W shape roof beams in concrete. Does anybody know a good reference for this type of member. I have a copy of AISC design guide 6 but is seems to be discuss only composite column design. I have not done any calculations yet but I'm assuming the existing beams can cary the weight of wet concrete, or roof live load, but not both. Therefore, the concrete encasing the beam will need to act compositely with the beam (shear transfer via welded studs) I've done lots of beams composite with slabs, but never an encased beam. Any help is greatly appreciated.
RE: Design of Concrete Encased Beams
I don't know what type of coating is on the existing beams but I doubt that paint is a good thing. Does DG6 address the required coating, or lack thereof, for composite columns? It seems like the same standard should be applied here.
I think that encased beams are fully composite without shear studs, but check the Manual to make sure. I think it specifically says this. Even so, I'd feel better about it if I added some shear studs. I'd also add corner bars and stirrups at some kind of a wide spacing just for overall integrity.
It's been a while since your original post, so I'd be interested to know how this turns(ed) out.
DBD
RE: Design of Concrete Encased Beams