Importance factor for EN 1998-1:2004

[Mohammed_Ata]

How can i add importance factor for this code ? 

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[Rafal.Gaweda · Accepted solution]

design ground acceleration on type A ground ag is equal to agR times the importance factor
3.2.1.(3) EN 1998-1:2004

[Mohammed_Ata]

Ok . 

What i understand is that  ag = Ground acceleration * Importance factor . Am i true ? 

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Another question please , can you show me what factor Beta is ?  I opened the help but i am still confused . 

I am grateful , Rafal . 

[Rafal.Gaweda]

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