Load combination also seems reasonable because nonlinear links are dependent upon displacements, and therefore, perhaps factors should be applied after the analysis is run.Īnswer: Nonlinear response is dependent upon the sequence in which loads are applied.Load case seems reasonable because combined loads may affect the links differently from when loads are applied separately and then summed.
To run a steel LRFD check, should I factor and combine load patterns by using a load case, or a by using a load combination? The system is subjected to static loading. How should I define load combinations for several nonlinear load cases?Įxtended Question: I have a 3D SAP2000 model with nonlinear gap and hook links located at restraint supports. How is loading applied at an angle relative to principal axes?Īnswer: To apply loading along a user-defined orientation, use statics to resolve X and Y force components, then combine these contributions within a load combination.Īs an alternative, the model may be rotated such that the direction of interest aligns with an orthogonal axis. I would like to apply an auto seismic load both parallel and perpendicular to this orientation. How is loading applied in an arbitrary direction?Įxtended Question: I am working on a building which has a wing non-orthogonal to X and Y.
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