HSS through bolt capacity
HSS through bolt capacity
(OP)
I am designing a HSS through bolt connection only subject to shear.
AISC eq. 7-15 and spec. J7 give the equation to predict the bearing strength of HSS through bolt holes. Does anyone know if the bearing capacity given by 1.8FyApb or 1.8nFydt refer to only one side of HSS wall? In another words, the total shear force can be resist by one through bolt is twice of that equation predicts because the through bolt is bearing on two side walls.
AISC eq. 7-15 and spec. J7 give the equation to predict the bearing strength of HSS through bolt holes. Does anyone know if the bearing capacity given by 1.8FyApb or 1.8nFydt refer to only one side of HSS wall? In another words, the total shear force can be resist by one through bolt is twice of that equation predicts because the through bolt is bearing on two side walls.






RE: HSS through bolt capacity
Mike McCann, PE, SE (WA)
RE: HSS through bolt capacity
No I am not referring single shear vs. double shear of bolt. I am talking about the bearing capacity predicted by 1.8FyApb. Does that only refer to bearing capacity of one side of HSS wall?
RE: HSS through bolt capacity
RE: HSS through bolt capacity
RE: HSS through bolt capacity
RE: HSS through bolt capacity
I'm thinking about a truss-type connection though. If you had a through bolt passing through an HSS sandwiched between two gusset plates, where the load was applied evenly to the gussets, that would load the sides equally.
RE: HSS through bolt capacity
RE: HSS through bolt capacity
Structural bolts As described in AISC 360 and RCSC, require a steel fill between head and nut. Not a hollow section. Your condition may result in bending stress within the length of the bolt. Not a good idea.
"Hollo bolts" or "blind bolts" are allowed in AISC. However these are proprietary and specifics are provided by the manufacturer. And these are not continuous "through bolts".
Bearing capacity of the wall thickness is one limit state that should be considered.
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RE: HSS through bolt capacity