PSA 9.3 — Seismic Response Spectrum Analysis: When 0.15 g Becomes 0.5 g
Lesson 3.4 ran a static seismic case on a 12″ water-filled rack line. The project criteria handed over a flat 0.15 g horizontal coefficient — the ASCE 7 lower bound, which is what almost always governs for welded steel pipe — and the occasional stress check came back at 14 % of allowable.
Now the criteria are revised. The line runs 12 m between lateral guides, the site spectrum is S_DS = 0.5 g / S_D1 = 0.25 g, and a response spectrum analysis is required.
Commit to an answer before reading on: will the answer change much?
The line's…
🔒 Members only
The rest of this lesson is in the members' libraryThe full text, the 3D model, the worked example and the quiz.
Join to read it →A members' lesson from EPiC Circle
This one is part of the members' library — the full lesson, its 3D model, the worked example and the quiz open with membership. Dozens of lessons across every EPC discipline are free to read without an account.
See what's free →Educational teaching material — simplified and illustrative. Not for engineering
design use.
© EPiC Circle · provided by PipeAxis