Effects of welding to RC structures, Cracks
Effects of welding to RC structures, Cracks
(OP)
Any thoughts?
Just today I found a crack line located at the mid-span of my 6-m (500mm x 700mm) RC girder. The girder was designed to be connected with a wide flange steel beam at the mid-point of it.
The connection used was a 10mm thick plate anchor bolted to the RC girder with 6pcs M20 chemical bolts.
The steel beam was then full welded to the plate.
What do you think? does the increase of temperature during welding caused the RC girder to crack? or please share if you also have the same experiences...
Just today I found a crack line located at the mid-span of my 6-m (500mm x 700mm) RC girder. The girder was designed to be connected with a wide flange steel beam at the mid-point of it.
The connection used was a 10mm thick plate anchor bolted to the RC girder with 6pcs M20 chemical bolts.
The steel beam was then full welded to the plate.
What do you think? does the increase of temperature during welding caused the RC girder to crack? or please share if you also have the same experiences...






RE: Effects of welding to RC structures, Cracks
RE: Effects of welding to RC structures, Cracks
RE: Effects of welding to RC structures, Cracks
RE: Effects of welding to RC structures, Cracks
Why was the connection made in this manner? More standard practice would be to bolt a tee to the concrete, and in turn bolt the steel beam to the tee.
RE: Effects of welding to RC structures, Cracks
the crack is parallel to the girder... the cracks (one at the top surface of the beam and one at the bottom/soffit of the beam) are 3 times the plates width long and the cracks width is approximately 1-3mm.
My initial assessment on this is that the welding process really caused the cracks. It suddenly appeared during the welding process... we all know that of about 500-600 deg F can really weaken the concrete.
Any thoughts of any solution to this?
Thanks to all your replies.
RE: Effects of welding to RC structures, Cracks
It would then seem to me that the RC would be heavily reinforced at midspan. I would suggest that the heat generated by the welding may have expanded the chemset anchors and this may have caused the crack in the concrete.