- Back of the Envelope
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- Envelope #1: Site walls and earthquake
Envelope #1: Site walls and earthquake

This is the first issue of “Back of the Envelope.” Ok, that’s quite a mouthful. Maybe we'll just call it the Envelope.
Yeah that’s better – Welcome to Envelope #1.
(FYI, sidenote: I am writing this as if I am talking to someone who has at least 'some' knowledge of structural engineering and/or has been practicing for a few years. So if there are details I skipped that make no sense to you, just let me know and I can potentially dive in further in a separate email or post. Or I can record a Tiktok/Instagram video to explain it. Jk?)
Anyways, with that said, let’s dive in.
Today I am going to talk about:
Seismic load on a site (or yard) wall
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