Fy for Structural Fasteners
Fy for Structural Fasteners
(OP)
Can someone advise as to why the AISC (13th Edition) does not list the Yield Stress for a majority of it's fasteners? Table J3.2 lists the nominal stress of fasteners and threaded parts as the Nominal Tensile Stress and Nominal Shear Stress, where it appears as though these values are derived from the Ultimate Tensile Stress for the material. However, when designing tensile members per AISC Section D, there are design checks for both the Yield and Ultimate values. Here I find that the nominal tensile yield strength typically governs.
I've always used these equations (corresponding to Section J) with no problem. However, I'm wondering why there isn't a relation to yield values for these fasteners (ASTM A325 for example).
Thanks!
I've always used these equations (corresponding to Section J) with no problem. However, I'm wondering why there isn't a relation to yield values for these fasteners (ASTM A325 for example).
Thanks!






RE: Fy for Structural Fasteners
So the yield strength isn't applicable. They use such parameters as "stress at 2% deformation" to define a pseudo yield point.
RE: Fy for Structural Fasteners
RE: Fy for Structural Fasteners
Badger, yeah I realized that note is there... I'm stuck on WHY it does that. Would you attribute that to what Jed said about high strength bolts not having a clearly defined yield point? I'm trying to put together why I should be concerned about Fy for some tensile applications and why Fu is the only value that matters in other applications.