Best Approach to Model and Design a Simple Four Sided Moment Frame Building in RAM SS

I was wondering if there is any literature on the best way to approach the design of a simple four sided moment frame building using RAM Structural System?

Thanks,

Scott

Parents
  • Right, when the design is controlled by something in the Frame module (e.g. drift or steel provisions) then the user has to manually change the size (using View/Update or Assign – Size) until everything works. “Optimizing” lateral members is tricky for a number of reasons. Take a simple moment frame example. Given a certain size for the beam and columns you get a certain distribution of forces. If you then select a member size that has the strength to resist those forces then you change the force distribution, not to mention the self-weight, so another analysis is required and another optimization and so forth.

    We could add an iterative member optimizer to handle such a thing, and we probably should (I’m sure that’s already on the enhancement list somewhere), but when you add optimization for drift, seismic provisions, and joint checks that could get overwhelming.



Reply
  • Right, when the design is controlled by something in the Frame module (e.g. drift or steel provisions) then the user has to manually change the size (using View/Update or Assign – Size) until everything works. “Optimizing” lateral members is tricky for a number of reasons. Take a simple moment frame example. Given a certain size for the beam and columns you get a certain distribution of forces. If you then select a member size that has the strength to resist those forces then you change the force distribution, not to mention the self-weight, so another analysis is required and another optimization and so forth.

    We could add an iterative member optimizer to handle such a thing, and we probably should (I’m sure that’s already on the enhancement list somewhere), but when you add optimization for drift, seismic provisions, and joint checks that could get overwhelming.



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