I can help.
Do you have a cross section or any pictures you can share?
These are tied arches, not beams. There is a very big difference in behavior. Using these as roof joists or something similar would result is a greatly reduced span.
What spacing of beams?
How would you even attempt to straighten the curves beams?
Can you find a stamp anywhere on them that will give you the stress grading?
I've done a lot of research on this and I can't find anything with respect to those numbers