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h2. How do I run a pseudo-static lateral analysis? *Extended Question:* I need to run a pseudo-static lateral analysis in which structural inertia represents the earthquake load. I would like to apply a seismic coefficient to inertia such that lateral force is a fraction of _g_, and not an acceleration function similar to [response spectra|kb:Response-spectrum analysis] or [time history|kb:Time-history analysis]. How is this done? *Answer:* Pseudo-static seismic load may be assigned by applying a gravity load in the lateral direction. This is done as follows: # Define a separate [load pattern|kb:Load pattern], perhaps named Inertia. \\ \\ # Select Assign > Frame Loads _or_ Area Loads _or_ Solid Loads > Gravity, then assign the load pattern with gravity multipliers in the Global X or Y direction. \\ \\ # Specify a [self-weight multiplier|kb:Self-weight multiplier] of 0 such that the self-weight of the structure is not included in thethis [load case|kb:Load case]pattern. You may always check base reactions in the output tables for a given case or combination to ensure that self-weight is applied correctly. \\ An alternative is to use the seismic [auto lateral load|kb:Auto lateral load] pattern to calculate and assign the load according to specific requirements. This procedure is documented in the Lateral Loads Manual, available in the Manuals directory of the software installation directory. {hidden-content} *Related Incident:* * {incident:no=48096|comment=How to Define Inertia Load} {hidden-content} |
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