We investigated the issue and found that the design of double channels ( front to front ) is not working in the version 20.07.11.70 of STAAD.Pro SS6. The sections can be designed in earlier versions like 20.07.11.33, 20.07.10.65 etc. This will be addressed in SS6 SP3 release planned for Q2 of 2016. The issue id# is 447990. Design of Back to back channel is working fine.
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