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Re: Tilt-up wall Anchorage: 97 UBC[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Tilt-up wall Anchorage: 97 UBC
- From: "Bill Sherman" <SHERMANWC(--nospam--at)cdm.com>
- Date: 28 Jul 98 10:22:27 -0400
>The following questions have come up. 1. Is Fp in equation 32-1 and 32-2 a strength load or service load? When we do the design of the individual elements do we divide by 1.4 or not? 2. The value of Rp is in question for drilled and epoxied anchors. We typically use 5/8" diameter threaded rods embedded at least 5" into the concrete. We use Hilti HY 150, Simpson SET or Covert type epoxy adhesive. In UBC section 1632.2, paragraph 3, it indicates that shallow "chemical" anchors are to be designed for an Rp of 1.5. The last part of the same paragraph indicates that Rp for adhesive type connections are to be 1.0. What is the difference between a chemical anchor and a adhesive anchor? < My understanding is that all seismic loads in the 1997 UBC are strength level loads, so "yes", I would divide Fp by 1.4 for service level loads. Regarding anchors, the Rp of 1.0 refers to anchorage "by use of adhesive" - I believe this does not mean "adhesive anchor bolts" but rather connecting something directly using an adhesive applied to the surface. I would interpret an adhesive anchor bolt similarly to a chemical anchor bolt.
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