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Fatigue Question - AASHTO LRFD

Fatigue Question - AASHTO LRFD

Fatigue Question - AASHTO LRFD

(OP)
Looking in the 4th Edition AASHTO LRFD - Under 5.5.3.2, trying to figure out how to apply this. The way I interpret it is to calculate the stress in the reinforcing steel resulting from the fatigue load specified in 3.6.1.4 @ 1/3 of the span from the maximum moment and compare to the applicable equation listed in this section. Is this right? Also, seems that this same stress is part of fmin (combined with other stress as indicated). Thanks for the help!

RE: Fatigue Question - AASHTO LRFD

I understand it to mean that the equations given in 5.5.3.2 are valid for all straight reinforcement and for welded wire that does not have a cross weld in the high stress region defined by 1/3 of the span on each side of the point of maximum moment. Equation 5.5.3.1-1 must be satisfied for the entire length of the member. Fatigue I [1.5(LL+IM)] is the fatigue load and it is also combined with other loads to find the CAFT - so it does plug into both sides of equation 5.5.3.1-1.

RE: Fatigue Question - AASHTO LRFD

(OP)
Thanks!

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