Ultimate Shear Stress
Ultimate Shear Stress
(OP)
Hi all.
When designing carbon steel structures for railcars,
I've often used 0.75 x (ultimate tensile strength) to calculate the ultimate shear stress.
Many peple would suggest using 0.58 x ultimate tensile strength.
What do most of you use? Can you suggest a reference?
The steel types are commonly A588, A572, A710.
Thanks in advance,
tg
When designing carbon steel structures for railcars,
I've often used 0.75 x (ultimate tensile strength) to calculate the ultimate shear stress.
Many peple would suggest using 0.58 x ultimate tensile strength.
What do most of you use? Can you suggest a reference?
The steel types are commonly A588, A572, A710.
Thanks in advance,
tg






RE: Ultimate Shear Stress
This information is in the commentary section F4 of the ASD manual, 9th edition.
I hope this is of help to you.
RE: Ultimate Shear Stress
This is a function of h/w and 0.58 is for short and stubby. You will need to reduce this as h/w and spacing of transverse shear stiffeners change. 0.75 is too high a number by any means. Check the AISC LRFD Steel Handbook, or AREMA under Steel Structures.
Regards
VOD
RE: Ultimate Shear Stress
I think 0.75Fy is not the proper value because steel will shear well below that.
Regards
RE: Ultimate Shear Stress
In the railway industry, when desiging to YIELD in shear, we use Fsy = 0.58 x Fy (yield stress)
When designing for ULTIMATE shear strength, the value of 0.75 x Ftu (ultimate tensile strength) is commonly accepted. I've now found the reference - it's the AAR (Association of American Railroads) Manual of Standards.
Cheers,
tg