Prestressing Abutment Capacity Evaluation

[StrEngr2021]

Hi
For prestressing abutment shown in attachment, the capacity is listed as 6,000 kips (26689.3296 KN). However, no back-up calculations are available for review. Appreciate tip/guidance on how to analyse this using RISA, or another method, to verify the listed capacity.

 

[Ingenuity]

I think you need to get some specific information before you go to any computer analysis:

What is the eccentricity of the prestressing force above the top of abutment/bed?

What is the factor of safety applied to the 6,000 kips capacity?

What are the geotechnical parameters of the supporting ground?​

How wide is this abutment/bed - cause that is a bunch of prestressing force - like 150+ strands depending if 0.5" or 0.6" dia strand.

 

[StrEngr2021]

Thanks and you’re correct that this translates into 134 strands, 0.6” in diameter.
FS is stated to be 1.5; abutment is about 30ft wide (plan dimension); and eccentric is fairly large—-36 inches.