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  • Controlling Fundamental Building Period

    I am running the seismic analysis for a 3 story structure and have questions about how to determine the appropriate building period to use for the seismic analysis. Gravity system is typical steel frame, with composite slab/framing at 2nd and 3rd Floors…

  • RAM Frame Dynamic Analysis Criteria

    When performing a dynamic analysis for Response Spectrum in Ram Frame, is it correct to check the reduced stiffness for steel members in the criteria? I have a situation where I need to scale up my dynamic loads to achieve the 0.85*ELF forces. The question…

  • RAM Mass Participation with Ritz Vectors

    Hello, I have been trying to use the Ritz vector solution to get 90% mass participation in my model. I have noticed something I find odd, but perhaps this there is a rational explanation for this. Running 30 eigenvalue modes the mass participation in…

  • RAM SS Merging Nodal Loads

    Hello, I have a three story building with a rigid diaphragm on levels 2 and 3 (level 1 is ground). My roof is a metal deck and I want to analyze it as flexible. I created my Nodal load cases labeled Roof-X and Roof-Y, both Seismic Load type. I need…

  • RE: Determine Building Period with Ram Elements and/or Ram Structural System

    Both programs do it. Our Dynamic analysis FAQs should get you started: RAM Elements Dynamic Modal Analysis FAQ RAM Frame - Dynamic Modal Analysis FAQ

  • RE: RAM SS - Response Spectrum Analysis according to AS1170.4

    Regarding the scale factor, what we usually tell people to do is scale the dynamic load by Ie/ R, then check the base shear and compare to the lower bound limit of .85* ELF approach, and re-scale if the dyn result is too low. communities.bentley.com…

  • Bentley Success Factors Webinar: A Practical Approach to Using the Response Spectra Analysis Method

    A Practical Approach to Using the Response Spectra Analysis Method Webinar Q & A Webinar Date: June 2015. Repeated September 2016. A recording of the Bentley Success Factors webinar titled A Practical Approach to Using the Response Spectra Analysis…

  • RAM Frame - Eigenvalue Error [TN]

    Applies To Product(s): RAM Structural System; Ram Frame Version(s): Any Area: Analysis Eigen Value Error Messages The Eigen Value (eigenvalue) error message is given when the program cannot calculate all…

  • RAM Frame - Dynamic Analysis FAQ

    Product(s): RAM Structural System (Ram Elements or STAAD.pro) Version(s): Any Area: Analysis; Dynamic Analysis How does a dynamic analysis using response spectra for seismic loads differ from a static analysis using…
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