Static earthquake in piping system 1

[kurtz]

If I want to take into account 'static earthquake' for piping system and peak ground acceleration = 0,3g, what value should I take for the calculation?
PGA=0,3g or Peak ground spectral acceleration = approx. 0,3g x 2,5 = 0,75g ? (skipping soil type and importance factor).
In the first case will be too liberal in the secound case will be too conservative

I know it's best to do dynamic analysis, but I'm asking about the simplify static equivalent of earthquake.

 

[HTURKAK]

I will suggest you to look 18.5 PIPING SYSTEM SEISMIC DESIGN and worked examples.

https://www.fema.gov/media-library-...c7a1d1a3b864648554198526d671f/FEMA_P-1051.pdf

If you give more info regarding the piping, service, joint type, supporting cond's , on the rack etc.. you may get more specific responds.

 

[KevinNZ]

Kurtz- you have not said what seismic code and piping code you are designing to.

 

[kurtz]

It's general question. Code EN 13480. Seismic code whatever you want. It should be correct with engineering point of view.
I think it will be better assume PGA. Peak ground spectral acceleration will be too far... in general, static equivalent is a big simplification

 

[kurtz]

I found in the EN13480, it should be PGA * 1,5

 

[XL83NL]

Where in EN 13480?

Huub

 

[HTURKAK]

The subject code, Eurocode 8: Design of structures for earthquake resistance —
Part 4: Silos, tanks and pipelines 5.4.2 of item 3 is below:


Peak of spectrum is not PGA. Peak of specktrum = 2.5 S η

This value is used for the design of support connection.