In our last version of Staad V8i, serie 6, version 20.07.11.82, we can't make a checkcode for back-to-back channel section. In older version, we used to make checkcode for these section without any problem.
Do you have any solutions about that?
Thanks in advance
Which design code are you trying to use?
I'm trying to use AISC LRFD (or LRFD shortly) to check. I tried one more time with AISC 360-05 with Method LRFD but it did not work either.
The design of back to back channels is not supported in the AISC LRD design code. The design of such sections is available in STAAD.Pro as per AISC ASD (9th edition) and AISC Unified (360-05 and 360-10) design codes (both methods - ASD and LRFD).
Please attach the model where the design of back to back channel is not working for AISC 360-05 LRFD code.
Infact, the LRFD checkcode can work with this version : Series 5 - 20.07.10.41.
Frame_check_AISC_360-05-LRFD--SS6.rarFrame_check_AISC_360-05-LRFD-SS5.rar
But I'm worry about the ratio of resistance checkcode:
- The resistance ratio in Serie 5 - version 20.07.10.41, is 0,81 follow AISC-360-05-LRFD.
- The resistance ratio in Serie 6 - version 20.07.11.82, is 1,31 follow AISC-360-05-LRFD.
The checkcode LRFD in Serie 5 was correct or not?
I do think that there is a problem in Serie 6, version 20.07.11.82 in checkcode AISC-360-05-LRFD. Please investigate two files bellow : Same structure(same load+frame), same checkcode, but different ratio between serie 5 and serie 6.