Current Revision posted to RAM | STAAD Wiki by Sye on 8/19/2016 10:26:52 PM
| Applies To | |||
| Product(s): | STAAD.Pro | ||
| Version(s): | All | ||
| Environment: | N/A | ||
| Area: | Design | ||
| Subarea: | American Steel Design | ||
| Original Author: | Bentley Technical Support Group | ||
I am using STAAD to perform steel design on a member per the AISC ASD code. I want the column to be designed based on an unbraced length of 20 ft. I have set the UNT and UNB values to 20 ft, but STAAD appears to consider only a 10 feet length in its KL/r calculations. How do I correct this problem?
The parameters UNT and UNB are for specifying the unsupported length of the compression flange for the purpose of computing allowable stresses in bending compression.
If you want to specify the unbraced length for the purpose of computing allowable stresses inaxial compression, use the parameters LY and LZ. See Table 2.1 of the STAAD.Pro Technical Reference Manual for details.
Tags: column unbraced length, bending compression, LRFD, AISC ASD, UNT, UNB, AISC 360