allowable fatigue stress
allowable fatigue stress
(OP)
Suppose I have a beam in which actual bending stresses are 33 ksi. It is grade 50, compact, braced @ < Lc, hence it is OK. What will be allowable fatigue stress in it. Let load cycle be > 2,000,000






RE: allowable fatigue stress
Per Table A-K4.2 you'd find you have stress category A.
For 2,000,000 cycles you have Loading Condition 4 found in table A-K4.1.
For Loading Condition 4 you have a max. stress range = 24 ksi per Table A-K4.3.
RE: allowable fatigue stress
RE: allowable fatigue stress
I recently performed some fatigue design checks. The connection material checks were by far the most time consuming. You need to figure your actual stress ranges and then check each component for each applicable portion of the table in the fatigue section of the AISC specification.
RE: allowable fatigue stress