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How can I account for 100/30 orthogonal load effects when using dynamic load cases?

April 26, 2017account cases Dynamic load orthogonal

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How can I account for 100/30 orthogonal load effects when using dynamic load cases?

1 Answer

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Experts have recommended using a SRSS combination of two orthogonal response spectra analyses to determine the critical forces in a dynamic analysis (see reference below). This method is not implemented in the current version of RAM Structural System. You will need to use load combinations to account for this code requirement. “A Clarification of the Orthogonal Effects in a Three-Dimensional Seismic Analysis,” E.L. Wilson, I. Suharwardy, and A. Habibullah, EERI Earthquake Spectra, Vol. 11, No. 4, Nov. 1995.