Dear many specialists.

I'm doing piping stress analysis for a power plant then based on EN1998-4_Part.4 : Silos, tanks and Pipelines
I used to apply static seismic analysis based on coefficient calculated UBC or ASCE..
But EN1998-4 is the first time to use.
EN1998-4 probably suggests the calculation method as response spectrum analysis but also they indicates to allow "lateral force method" of (linear-elastic) analysis.

anyone knows or has experience to use static analysis based on EN1998-4?
I wonder if the acceleration value should be calculated by nonstructural element formula (4.3.5.2 Verification_EN1998-1).