Ok .
What i understand is that ag = Ground acceleration * Importance factor . Am i true ?
.
Another question please , can you show me what factor Beta is ? I opened the help but i am still confused .
I am grateful , Rafal .
β is the lower bound factor for the horizontal design spectrum.
NOTE The value to be ascribed to β for use in a country can be found in its National Annex. The recommended value for β is 0,2.
3.2.2.5 EN 1998-1:2004