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Thank you for logging this idea. The values of C1, C2 and C3 are for use with the Dutch NA. This gives values for a range of sample loading situations, but left to the engineer to determine values to use when the member is under some other loading situation. The flexibility of a STAAD model is such that the member could have any manner of loading applied point loads, patch and distributed loads etc and as such what values should be provided? Unless a reasonable logic can be suggested this should remain the responsibility of the engineer.