Welding HS bolt to plate
Welding HS bolt to plate
(OP)
A contractor has proposed an alternate connection to a piece of cast-in-place concrete. Rather than cast HS bolts into the concrete with the bolts projecting upwards, he proposes to cast a steel plate with rebar projecting into the concrete welded to the bottom of the plate and HS studs welded to the top and projecting upwards.
The entire assembly will be hot dip galvanized. What questions would you have for the contractor?
I am concerned about fatigue performance of the weld to the studs. I am concerned about the effect of HDGalvanizing on the rebar. I asked him if he had specified A706 resteel instead of A615. Anything else?
The entire assembly will be hot dip galvanized. What questions would you have for the contractor?
I am concerned about fatigue performance of the weld to the studs. I am concerned about the effect of HDGalvanizing on the rebar. I asked him if he had specified A706 resteel instead of A615. Anything else?
RE: Welding HS bolt to plate
Last, but probably most important, welding of fasteners is typically not good engineering practice. The heat from welding will adversely affect the strength properties of the fastener.
RE: Welding HS bolt to plate
RE: Welding HS bolt to plate
Points above regarding welding are good and should be considered. No reason to do this alternate unless there is absolutely no way the bolts can be cast into the concrete.
RE: Welding HS bolt to plate
The contractor is proposing this so he can slip-form a concrete parapet on a bridge. Many around here would rather he simply cast the parapet without slip forming, but with one set of a-bolts every eight feet or so, that is a lot of parapet to hand form.
Dinosaur