Seismic Deformation Compatibility Design

Hey, Does RAM check gravity columns for deformation compatibility for seismic design categories D through F per ASCE 7-10 12.12.5 ?  Also, I read something about ASCE 7 Stability coefficients from RAM 15 release notes ( pic below) what is this about? 

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  • Our approach is that the gravity columns are assumed pinned and they lean upon the lateral frames so the lateral frames are designed for the full P-Delta effect of the entire set of gravity loads.

    For gravity concrete members we do implement ACI 318 21.11.  

    8.29 ASCE 7 Stability Coefficients
    The ASCE 7 Stability Coefficients report list calculated stability coefficients according to Eq. 12.8-16 in ASCE 7-05, ASCE 7-10, and ASCE 7-16. These coefficients are only reported for ASCE 7 seismic load cases. Note that gravity load cases must be also analyzed in order to calculate the stability coefficients. The report contains two sections for each seismic load case analyzed: the first section reports diaphragm shears, drifts and vertical loads;
    the second section shows calculated stability coefficients and also it reports max. permitted limits according to ASCE 7-05, ASCE 7-10, and ASCE 7-16. Note that calculated vertical loads include dead, live, roof and snow loads (live loads are reduced with live load reduction factors).



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  • Our approach is that the gravity columns are assumed pinned and they lean upon the lateral frames so the lateral frames are designed for the full P-Delta effect of the entire set of gravity loads.

    For gravity concrete members we do implement ACI 318 21.11.  

    8.29 ASCE 7 Stability Coefficients
    The ASCE 7 Stability Coefficients report list calculated stability coefficients according to Eq. 12.8-16 in ASCE 7-05, ASCE 7-10, and ASCE 7-16. These coefficients are only reported for ASCE 7 seismic load cases. Note that gravity load cases must be also analyzed in order to calculate the stability coefficients. The report contains two sections for each seismic load case analyzed: the first section reports diaphragm shears, drifts and vertical loads;
    the second section shows calculated stability coefficients and also it reports max. permitted limits according to ASCE 7-05, ASCE 7-10, and ASCE 7-16. Note that calculated vertical loads include dead, live, roof and snow loads (live loads are reduced with live load reduction factors).



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