Seismic load definition

Question

Seismic load definition

Bozo_Sam (Aerospace)

(OP)

9 Jun 21 07:04

Hi there. I am trying to define the seismic load using the ASCE 7. I have some troubles defining the "Ss" and "S1" parameters for my location (London)

Many thanks for help,

Uroš

EireChch (Geotechnical) · Answer 1 · 2021-06-09 12:15:45

What are you designing? I have never seen a structure in the UK designed to consider seismic forces. You wont find any maps for London.

If you have a project in the UK that needs to consider seismic then you need a probabilistic seismic hazard assessment(PSHA)

JedClampett (Structural) · Answer 2 · 2021-06-09 14:38:45

You should delete this post and re-post in https://www.eng-tips.com/threadminder.cfm?pid=507.
All structural, all the time and plenty of English blokes will read it.

Lomarandil (Structural) · Answer 3 · 2021-06-17 04:12:10

I agree with the above posts.

However, UFC 3-301-01 lists S1=4%g and Ss=13%g (PGA = 5%) for site class B in London

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just call me Lo.

EireChch (Geotechnical) · Answer 4 · 2021-06-17 05:11:57

Lo - where in this document does it provide site class for London. Did a quick text search and couldnt find.

CarlB (Civil/Environmental) · Answer 5 · 2021-06-17 21:51:44

The current UFC no longer includes load data, it refers to a website instead:
https://www.wbdg.org/additional-resources/tools/uf...

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Seismic load definition