How to Design Steel Roof Truss in STAAD Pro??

Hello everyone,

I'm new to structural analysis and design using STAAD Pro. I've been using staad for last 6 months or so. So much to learn eh! I'm somewhat okay with concrete but know nothing about steel, I mean in staad.

I'm trying to analyse and design this long span (30 metres) steel roof truss using staad. Managed to get zero errors and warnings in the analysis report but when it comes to CODE CHECK, members fail! I'm pretty sure that I've done something really wrong (the way members are connected, material choice etc).

I've attached .std file with this post. It's an open structure. Can someone please have a look and guide me to get the perfect analysis and design pointing out the mistakes I've done in staad model.

I'd also like to know how I can add vertical and diagnol members to an arch (staad wouldn't allow)

Thanks in advance :)

Roof Truss Trial 3.std
  • You may proceed as under:

    In the input file, change staad space to staad plane in the first line.

    Delete the two load cases for  the wind load in X direction because your truss is in YZ plane and that there is no restraint in X direction.

    Assign beta angle to the few bracings which are still failing as 45 degree. All the members will pass except for two small members which are marginally failing and those may be accepted.

    Please respond if you do not get the desired output.