AISC bolt pretension
AISC bolt pretension
(OP)
Hi
I'am reading the AISC 'specification for steel structural buildings 2010' (ASD), and find chapter J.3 a bit confusing when it comes to bolt pretension and tensile strength.
So my question is:
Why is the minimum bolt pretension set to 0.7*Fu according to table J3.1 and allowable tensile strength set to Fu/omega = 0.5*Fu as in equation J3-1? It seems like the bolt pretension force is higher than the allowable tensile force. But that doesn't make sense, so I hope that someone at this forum can help me understand.
Thanks
I'am reading the AISC 'specification for steel structural buildings 2010' (ASD), and find chapter J.3 a bit confusing when it comes to bolt pretension and tensile strength.
So my question is:
Why is the minimum bolt pretension set to 0.7*Fu according to table J3.1 and allowable tensile strength set to Fu/omega = 0.5*Fu as in equation J3-1? It seems like the bolt pretension force is higher than the allowable tensile force. But that doesn't make sense, so I hope that someone at this forum can help me understand.
Thanks





RE: AISC bolt pretension
RE: AISC bolt pretension
Check out Eng-Tips Forum's Policies here:
FAQ731-376: Eng-Tips.com Forum Policies
RE: AISC bolt pretension
Some of the bolted connections I'am working with is analysed in ANSYS, which include bolt pretension. So my bolt force will never get below the initial pretension.
But I guess the tensile strength for the bolts should be checked without pretension included.