I want to discuss about the two options in staad pro, 1) assigning truss specs to members 2) assigning pb brace command in parameters to top and bottom chord. i want to ask whats the difference between these two? if i use truss command what effect it will have on the truss and whether i have to assign restraints that is pbrace command if i have assigned truss specs to members or not?pbrace command is use to apply top restraint and bottom same as unt and unb but at specific points.?
i have these two models in which i have used pbrace command and truss command .. the model with truss command is passing the truss but in pbrace command and releases the model is not passing.
TEST .STD2308164-KON .STD
When you use a TRUSS specification, you tell the prohram that these members are capable of carrying only axial forces. Usually this command is assigned to the bracing members or web elements of the truss.
The PBRACE parameter is used to specify the restraint condition along the top and bottom flange of a PMEMBER. This design parameter is specific to the Australian and New Zealand steel design codes and it does not have any relation with the TRUSS specification as both are used for different purpose.
Thanks for the clarification.
can you tell me in this model why the top chord are behaving irregularly, as some chord members are giving values 94, 36 11, and some are passing , can you help me how can i pass the chords
3058.2308164-KON .STD
It seems to me that the members sizes are too small and that's why they are failing. In addition, you are using a cold formed sections and trying to design as per Australian AS4100 design code, which is meant for the hot rolled steel section design. I don't think that this is appropriate.
so if there is an option of using cold form members in staad pro, then why not there is the specific code for to design them.
There are some cold formed steel design codes (i.e. American, Indian) implemented in STAAD.Pro, but not Australian. You can perform the analysis of the cold formed sections, but would need to design it manually.