Ram Elements Single Angle AISC 360-10

Does Ram Elements properly apply the AISC 360-10 single angle requirements for bending, compression and combined stress for equal and unequal leg single angles?

Is deflection given for the geometric or principal axes?

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  • Local member deflections are associated with the principal axis. The exception is when the "Laterally Restrained for Torsion" option is checked for use in the section properties. In that case, the local member deflections are associated with the geometric axis.

    The design checks should be correct. The program does use a conservative approach when checking lateral-torsional buckling (AISC F4.2). AISC permits equal leg angles to be designed with respect to the principal axis or the geometric axis. RAM Elements checks both. There is a logged enhancement request (Enhancement #277754) to add a user option to select one or the other for design. Some engineers choose to design equal leg angles with respect to the geometric axis only.



  • For bending does RAM look at all 4 possible configurations for an unequal leg angle, LLV toe up, LLV toe down, LLH toe up and LLH toe down?

    Can I assume that the loads are still applied using the geometric axes and not the W and Z principal axes?
  • RAM Elements only considers the member with the orientation defined in the Orientation of Local Axes worksheet (Members tab - Local Axes button). If you want to consider multiple orientations, you will need to manually change the orientation.

    Member loads can be defined with respect to the global axis or the local axis. If they are defined with respect to the local 1, 2, or 3 axis, then they are referenced to the geometric axis and not the principal axis.



    Answer Verified By: SVGregory 

Reply
  • RAM Elements only considers the member with the orientation defined in the Orientation of Local Axes worksheet (Members tab - Local Axes button). If you want to consider multiple orientations, you will need to manually change the orientation.

    Member loads can be defined with respect to the global axis or the local axis. If they are defined with respect to the local 1, 2, or 3 axis, then they are referenced to the geometric axis and not the principal axis.



    Answer Verified By: SVGregory 

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