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The mass distribution directly determines story shears and the total base shear ( V ), which is the total horizontal force the earthquake exerts on the structure. The base shear is a function of the effective seismic weight, W (the total mass from your Mass Summary by Story , converted to weight). You can find this in the program's printed summary.

: For seismic design, understanding the mass distribution is key. The mass of a structure directly influences its seismic response. A well-distributed mass can lead to a more stable structure under earthquake loads. etabs mass summary by story better

An error in mass modeling—such as double-counting live loads or missing self-weight—will lead to incorrect design forces. The Best Way to Check Mass: Mass Summary by Story The mass distribution directly determines story shears and