Molina Hutt, CM; (2012) Seismic Assessment of Typical 1970s Tall Steel Moment Frame Buildings in Downtown San Francisco. Presented at: 15 World Conference of Earthquake Engineering, Lisbon.

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Abstract

An inventory of the existing tall building stock in San Francisco revealed that most tall buildings in the city were built in the 1970s and 1980s and adopted a steel Special Moment Resisting Frame (SMRF) structural system. In order to assess likely performance to current standards an archetypical 40-story steel SMRF building design was developed to represent the existing tall building stock. The building was designed per the 1973 Uniform Building Code (UBC 73), supplemented by the 1973 SEAOC Blue Book recommendations (SEAOC 1973), and employed connection details characteristic of the time. Nonlinear response history analyses were carried out in LS-DYNA (LSTC) with ground motions representative of the Maximum Considered Earthquake (MCE) hazard level defined in current building codes, which for San Francisco is near a 1000 year return period due to the deterministic limit on the MCE. Under this level of shaking roughly 80 to 85% of the buildings are expected to sustain severe damage capable of causing loss of life and such that the structure may be at total economic loss. A small proportion of buildings may collapse.

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