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  • Understanding Drift Results

    Hello, I am trying to understand drift results for my structure using RAM SS. We have semi-rigid diaphragms modeled and are trying to use the drift at control points to check the drift ratios. We have chosen select frame nodes coordinates as our control…

  • Seismic and Wind Drift Calculations

    When analyzing a structure in RAM Frame, do the drift results calculated use the ultimate or the service wind load? Also in RAM Frame, do the seismic drift results calculated use an elastic analysis or is the design ratio calculated by multiplying by…

  • RAM Frame Total Displacement & Story Drifts Output

    I am running into a weird output from Ram Structural System's, RAM Frame module regarding total displacement/drift. From my understanding, the Total Displacement at the roof level should equal the sum of the displacements of both the roof and second…

  • RAM Frame - Story Drift at Control Points

    Applies to Product: RAM Frame Version(s): Any Area: Results Values for the report. Displacement: Total displacement at that coordinate Story Drift: Displacement relative to the floor below. Drift ratio: (Story…

  • Drift

    What is the best way to look at building drift when your floor plan changes up the building? I am looking for the drift between floors but my building floor area steps in above L2 through to the Roof, but the facade is sloped and reaches out from the…

  • RE: RAM Frame Drift Control Module: Question about Virtual Loads and Load Pairs

    I have only used virtual load cases with lateral force on a single diaphragm. The program allows you to enter other loads, but I've never had a good reason to do so. I ran a simple test here and I don't think the scale for the load pair actually does…

  • RE: Drift ratio in RAM Structural System - Story offsets/multiple stories?

    The program checks the same plan location for each story and identifies if there is a diaphragm at the adjacent story or not before calculating the story displacement in the drift report. I also like to double check this using nodal displacements when…

  • RE: Story Drift Results Interpretation

    I'm not sure what program you are using or what kind of output, so I'll try to answer in general terms. For any finite element analysis application that uses a rigid diaphragm assumption, the horizontal displacement of the diaphragm can be given at…
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