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[SEAOC] [SEAOC] 9" Anchor Bolt Embedment -Reply[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: LBRUGGER(--nospam--at)BAS.CI.LA.CA.US, seaoc(--nospam--at)power.net
- Subject: [SEAOC] [SEAOC] 9" Anchor Bolt Embedment -Reply
- From: Nick Delli Quadri <NDELLIQU(--nospam--at)BAS.CI.LA.CA.US>
- Date: Mon, 09 Sep 1996 16:26:15 -0700
The anchor bolt length was increased in response to the common problems observed after the Northridge Earthquake. An unfortunate, but very common construction sequence used by builders of residential buildings constructed on slab foundations is to use a two pour sequence. The footings are poured first, causing a horizontal construction joint to be formed at the slab to footing interface. This joint must be clean and free of sand and debris before the slab concrete is poured if good shear transfer is occur. This does not happen as building inspection can not assure this without being at the site during the pour. Sliding of slabs and sand pockets were observed in many instances. The additional length of the anchor bolts as well as the decrease in spacing to four feet is expected to provide significant enough doweling action to prevent slip from occurring, and prevent concrete pop outs at the footing edge due to shallow embedment (approx 1 inch) into the footing at the construction joint. ...
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