Allowable bending stress in AREMA manual

[gre2408]

Can anyone tell me what is the allowable bending stress in AREMA design manual? I just ordered the manual online, but have to wait for 3 to 4 days to receive it. I don't want to sit and waste my time and hopefully want to do some prelimnary calcs between now and then (I heard somebody saying it is different from AISC (66% of Fy). Thanks!

 

[jdonville]

AISC is no longer "66% of Fy". AISC is dependent on compactness, symmetry, and shape. For yielding, you will ususally relate maximum capacity to Fy*Z or Fy*1.5*S. The factor used will also depend on whether you are using nominal loads (ASD) or ultimate loads (LRFD).

Jeff

 

[PEinc]

Arema has different allowable bending stresses for different structures. The maximum stress for a bridge may be 0.55Fy while for steel sheet piling it may be 2/3Fy. You need to read AREMA to get the answer. Unfortunately, AREMA is expensive.

 

[PEinc]

Also, the specific railroad you are working on may have its own maximum allowable stress. Check the railroad's specs also.