I am designing an octagonal tapered tubular pole which requires the use of the ASCE solver. Staad gives a utilization ratio/unity check result but it does not change when the yield strength of the material is changed - for example I get the same result using steel with yield strengths of 36ksi and 50ksi. I'd expect the results to differ when using a higher yield strength steel. Also no load case is specified in the results as the critical case. The output file lists only a ratio and a "pass" or "fail" for the prismatic members. What is the ratio calculation based on when using this solver?
Thanks for any insight.