Re: Seismic Joint at foundation[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Seismic Joint at foundation
- From: Jnapd(--nospam--at)aol.com
- Date: Thu, 7 Apr 2005 21:17:06 EDT
We did a lot of earthquake damage assessment, design, upgrades, and repair after the Northridge earthquake. We worked for several years on structural damage. I did not see any evidence of foundations slipping on top of the dirt.
I did see several houses, mainly newer ones with damage from the slab sliding relative to the footings. This occurred on almost all houses where the contractor decided to use a two pour system for the slab and foundation. The contractor installed 1/2" anchor bolts stabbed into the first pour (foundation) and then later placed the slab. Therefore; 1/2" anchor bolts are used for shear transfer to the footings. But ..........the inspector said it was OK was the typical response. Hilti sold a lot of Cy-150 adhesive.
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