Bolt Direct Tensioning
Bolt Direct Tensioning
(OP)
Hi all,
When it is specified that a bolt is to be direct tensioned to 70% of capacity, would it mean that I can obtain that direct tension force by multiplying the bolt area by its ultimate strength and then by 0.70, or are there additional factors that I have to take in consideration? A prompt response would be appreciated!
When it is specified that a bolt is to be direct tensioned to 70% of capacity, would it mean that I can obtain that direct tension force by multiplying the bolt area by its ultimate strength and then by 0.70, or are there additional factors that I have to take in consideration? A prompt response would be appreciated!






RE: Bolt Direct Tensioning
RE: Bolt Direct Tensioning
there are "standard" tables for preload in "typical" (shear)applications, depending on the size. a rule of thumb is T = P*D/5 (T=torque, P-=preload, D = diameter).
the high value of preload you've quoted (70% fty) is usually applicable to bolts with tension loads applied; in order that the joint doesn't gap inservice.
RE: Bolt Direct Tensioning