Based on your post, I am now understanding that this warning "The number of iterations exceeded 500" does not mean that member has failed. It means member has passed but capacity ratio parameter IR could not be calculated accurately for the same.
Please confirm this is correct.
Also, I notice your posts indicate you are part of Bentley's Select Support staff. Hence, this would be equivalent to official confirmation from Bentley on the same. Hope I am correct
Sorry for any inconvenience but reason I am asking for this is that this warning is present in my STAAD output which I need to submit for cross-verification and an official explanation for this warning could not be found earlier to my satisfaction.