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[SEAOC] Re: [SEAOC] Re: [SEAOC] Fwd: Conventional construction provisions[Subject Prev][Subject Next][Thread Prev][Thread Next]
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- Subject: [SEAOC] Re: [SEAOC] Re: [SEAOC] Fwd: Conventional construction provisions
- From: David Owens <dtowens(--nospam--at)cogent.net>
- Date: Fri, 7 Jun 1996 21:39:29 -0700 (PDT)
At 11:02 AM 5/23/96 -0700, Wish wrote: >BTW, in addition to my comments to Ray's message I would like to add one >or two observations from the damage that I inspected from Northridge. > >1. One home in Woodland Hills appeared to be constructed according to an >engineered set of plans. This was evident from the use of very heavily >sheathed interior shear walls. The one interior wall I inspected was >sheathed both sides with 15/32" Structural II plywood and nailed with >10d nailing at 4:4:12. Simpson HD15's (or possibly 20's) where attached >at each end and anchor bolts where assumed sufficient since the wall was >not open to inspection. The wall was set on a foundation that was at >least three feet wide, but could not be verified by sight for depth. >The kicker was that the top plate of the wall was nailed to the ceiling >rafters and this is where it stopped. There way about three feet of >space between the top of this wall and the roof diaphragm. >The location of the wall suggests that it was designed for about 50% of >the tributary shear, but since it wasn't connected to the roof (and >assuming that a gypsum ceiling was not used to transfer shear from the >another portion of diaphragm down to the wall) it was useless. > >Structural Observation requriments may have prevented this from >happening. If this contractor/framer did not understand how to connect a >shear wall, how would a simple framer who builds under conventional >framing requirments know the engineering principles for shear transfer? > >2. How many hundreds of stucco failures occured? How much damage was >caused from plywood shear wall deflections exceeding code story drift of >0.005h? Too much from what I saw. > >Finally, how can ICBO publish codes to allow non-professional to >construct even low risk structures when the engineering community can't >enforce even decent construction practice? > >Dennis > >... >One problem is the engineers will not get off their asses and go to the jobsite. After one visit they want to start charging fees. This doesn't get it. I have never seen a set of plans or a building that was free from errors and omissions, or that did not need changes. Just trying to get the "professionals" to give us a stamped drawing takes Herculean efforts. Structural observation is a joke. David Owens Senior Construction Inspector, City of Los Angeles > > ...
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