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RE: Terracotta Behaviour[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Terracotta Behaviour
- From: "Dennis S. Wish" <wish(--nospam--at)cwia.com>
- Date: Thu, 13 Aug 1998 12:14:29 -0700
As I mentioned in my past post, Terrecotta has been used in the design of bearing wall systems here in the Los Angeles area. Those that are bearing wall are part of the state Hazardous Building programs that require them to be identified. Retrofit standards are left up to the local building officials, however, they are required to be retrofit within Los Angeles and most of Los Angeles County.
The design of URM bearing wall systems conforms to the Uniform Code for Building Conservation Appendix Chapter 1 - unless required otherwise by the local building official or if the building is listed on a historic registry.
The design of URM structures is much less restrictive than new construction - however their are to design proceedures that can be used upon the descretion of the engineer of record.
The Special Proceedure methodology is the least restrictive and assumes that failure will occur in the weakest element. Rather than strengthening the weakest link, all other elements are designed to the weak link failure. The thought is that these buildings exist and are used, in most part, for lower income housing and for affordable rent spaces. To try and bring them up to current code is expensive and would be detremental to ecconomy of the area's were most of these buildings occur. The allowable base shear used to design anchorage is generally around 0.10Wd or 10% of base shear rather than 30% based upon designing portions of a building.
The design intention is to try and maintain the structural integrety of the building sufficiently to allow people to escape. Once people are safely out, the building can be repaired or destroyed. It is purely a life safety issue, although there are no guarantees that the building won't cave in. Historically, retrofit buildings performed better than those which were not.
You might obtain a copy of the SEAOC Blue Book from seaosc(--nospam--at)aol.com . This is the document that the UCBC was dirived from. It explains your options should you wish to comply to a standard which is fairly well adopted along the US west coast.
One more thing: You might also contact Hilti Anchor about their veneer ties. They developed a pin that worked rather well with little patching required after installation.
Dennis S. Wish PE
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