Horizontal components of seismic action shall be taken as acting simultaneously.This can be made by a)EEh"+"0.,30EE (4.18) b)0,30EE"+"EE动 (4.19) where implies "to be combined with"; hehosaihoiSnlarroteontmancaiaofthecimieacioualoag ats the ac effects due to the a of the same seismic action If vertical ground acceleration is higher than 0,25g,then vertical component has to be combined with horizontal components as following: a)EE"+"0.30EE"+"0,30EE (4.20) b)0,30EEk"+"E"+"0.30EEd (4.21) c)0.30EE"+"0,30EE"+"EE 4.22) where "implies"to be combined with" Egds and Egdy are as in 4.3.3.5.1(3): EEdz represents the action effects due to the application of the vertical component of the design seismic action as defined in 3.2.2.5(5)and (6).Horizontal components of seismic action shall be taken as acting simultaneously. This can be made by If vertical ground acceleration is higher than 0,25g, then vertical component has to be combined with horizontal components as following: