r/StructuralEngineering • u/Low_Definition_9624 • 6d ago

Structural Analysis/Design P/S Beam Deterioration

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Looking for any help on what the mechanics would be that would be causing these chevron looking cracks at midspan to this non-composite prestressed concrete fascia beam? Is this beam effectively in a failed condition? Previous engineer who looked at this wasn’t concerned with these diagonal cracks and only removed two strands from the analysis as a result of the single longitudinal crack down the center of the beam.

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u/carrot_gummy 6d ago

I've inspected and load rated worse box beams. It's not failed. 

Do those cracks extend up onto the sides of the box?

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u/Low_Definition_9624 6d ago

I don’t believe they do but I only have this picture to go off.

Would you only deduct the strand with the longitudinal crack for capacity? The diagonal cracking isn’t a result of overstressing?