HSFG bolts in shear
HSFG bolts in shear
(OP)
The number of High Strength Friction Grip bolts required to satisfy shear stress requirements through the tensile stress area is much less than the number of bolts required to prevent slip (using BS5950). These bolts are supposed to work by passing the load through the frictional forces between the two connections and not through the bolts. Does it matter if the surfaces slip?
corus





RE: HSFG bolts in shear
Dik
RE: HSFG bolts in shear
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: HSFG bolts in shear
One problem with friction grip bolts, especially a close bolt group, is getting enough torque on all the bolts to ensure the connection works. What can sometimes happen is as you torque up one bolt to the required rating, it loosens the already tightened adjacent bolt. You end up going round in circles trying to get all the bolts properly tightened.
RE: HSFG bolts in shear
As a further basic question: Why would slip be critical? If it was a bridge that was bolted together for example, why would slip be critical as eventually the bolt must make contact with the clearance hole for shear to occur in the bolt. The paint might crack but if the slip occurred for some worst case scenario rather than normal operating conditions then would it be a problem? Are there any examples of when slip would be considered critical or even not desirable?
corus
RE: HSFG bolts in shear
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: HSFG bolts in shear
corus
RE: HSFG bolts in shear