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[SEAOC] Seismic Rehabilitation of Buildings[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: [SEAOC] Seismic Rehabilitation of Buildings
- From: FEMCCLURE(--nospam--at)aol.com
- Date: Wed, 4 Dec 1996 03:52:13 -0500
- Cc: Sadre(--nospam--at)aol.com, dltodd(--nospam--at)erols.com, ROH(--nospam--at)eqe.com, danshap(--nospam--at)soha.com, reaveley(--nospam--at)civil.utah.edu, crojahn(--nospam--at)atcouncil.org, cpoland(--nospam--at)sinewave.com, ChrisArno(--nospam--at)aol.com
Dear Colleagues, December 3, 1996 We are indeed fortunate that Franklin Lew, SE, Building Official for Contrat Costa County, is willing and able to take the time to post messages on the SEAOC List Server. I agree completely with his December 3, 1996 reply to Ali Sadre's December 3, 1996 criticism of FEMA 178. Of particular importance from my point of view is the statement "And engineers may find their legal counsels and E&O insurance providers will be less than thrilled with multiple "standards of care" associated with multiple levels of performance." The following quotations from a forthcoming publication of the State of California Seismic Safety Commission, Products 1.2 and 1.3 of the Proposition 122 Seismic Retrofit Practices Improvement Program, "Recommended Methodology for Seismic Evaluation and Retrofit of Existing Concrete Buildings" by Applied Technology Council, Richard W. Niewiarowski, Rutherford & Chekene and Craig D. Comartin, principal authors, stand out in my mind to support Franklin Lew's points of view in his reply to Ali Sadre's criticism of FEMA 178 and his advocacy of "Vision 2000" and Seismic Performance Based Engineering Guidelines for the design of new buildings and the evaluation and guidelines for the rehabilitation of existing buildings. 1. Section 1.2.2, Procedure for Evaluation and Retrofit Design. " The owner's or building code official's selection of the performance objective that should be achieved by a building retrofit is beyond the scope of this document. This includes the identification of the level of seismic hazard that should be combined with the selected performance level. Once those decisions have been made, however, this methodology provides guidelines to meet that objective. Compliance with the procedure and requirements of this document will be deemed adquate for these purposes, but, due to significant variablility of expected ground motions and imperfect reliability of in-situs materials, the seismic performance incoporated into the performance objective is NOT GUARANTEED." (Emphasis added.) 2, Section 220.127.116.11, Earthquake Ground Motions Records. "Figure 4-2 illustrates that predictions of response (and performance) using smooth design spectra can significantly underpredict or overpredict response (and performance) that the building actually experiences during the design earthquake." Reading of Products 1.2 and 1.3 is strongly recommended for architects, civil and structural engineers, building code and regulatory enforcement officials, building owners and managers, insurance industry representatives, material interest representatives and others who are concerned about the seismic design of new buildings and the seismic evaluation and rehabilitation - retrofit - of existing buildings. Contact Fred Turner, Structural Engineer, State of California Seismic Safety Commission, 1900 K Street, Suite 100, Sacramento, CA 94814, Email address FredT5(--nospam--at)aol.com for publication date and availability. Frank McClure FEMCCLURE(--nospam--at)aol.com ...
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