Innovative Seismic Retrofit Scheme for 215 Fremont Street Building, San Francisco, California

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Title: Innovative Seismic Retrofit Scheme for 215 Fremont Street Building, San Francisco, California

Author(s): N. R. Amin, D. Figueira, and V. Wan

Publication: Special Publication

Volume: 209

Issue:

Appears on pages(s): 207-230

Keywords: building evaluation; seismic retrofit; Uniform Building Code

Date: 9/26/2002

Abstract:
The 215 Fremont Street building in San Fransico, California was designed by Albert F. Roller Architect, San Fransico, and built in 1927. It was a 7-story reinforced concrete structure, "L"-shaped in plan, with a 3 story tower located over the elevator core. The structure is supported on individual spread footings at the interior columns and continuous grade beams at the building perimeter. Damaged extensively in the 1989 Loma Prieta Earthquake, the building was declared unsafe. It remained unoccupied utnil 1999, when the property was sold "as is" to a new developer (Fremont Properties LLC). The developer embarked on a seismic retrofit of the existing building and the addition of two new floors, all on a build-to-suit basis for a single tenant (Charles Schwab Inc.). This paper will dexcribe in detail the evaluation of the existing building, analysis and design of the retrofit scheme, including the foundation, which meets the 1997 Uniform Building Code.