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Risk-based seismic performance assessment of existing tall steel-framed buildings in San Francisco

Almufti, I; Deierlein, G; Molina Hutt, C; Willford, M; (2015) Risk-based seismic performance assessment of existing tall steel-framed buildings in San Francisco. In: SECED 2015 Conference: Earthquake Risk and Engineering towards a Resilient World. Society for Earthquake and Civil Engineering Dynamics (SECED): Cambridge, UK. Green open access

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Abstract

This study presents the results of a risk-based seismic performance assessment of an archetype tall building representative of the existing tall building stock in San Francisco, CA. The archetype tall building, selected based on an inventory of existing tall buildings, is a 40- storey Moment Resisting Frame (MRF) representative of design and construction practice from the 1970-s to the mid-1980s. A Multiple Stripe Analysis (MSA) was conducted at 8 different intensity levels ranging from frequent to very rare seismic events, i.e. from 85% to 1% probability of exceedance in 50 years. Non-Linear Response History Analyses (NLRHA) were conducted with ground motions representative of each intensity level considered. The results of the NLRHA results were used to assess the probability of earthquake losses, considering collapse potential and the probability of the building deemed irreparable due to permanent residual drifts in the structure. Based on the MSA results, the collapse fragility of the structure, assumed to follow a lognormal cumulative distribution expressed as a function of spectral acceleration at the fundamental period of the structure (T=5 seconds), has an estimated median of 0.15g and a dispersion of 0.30. A number of loss metrics were developed for the archetype building including: a loss function, which provides the annual frequency of exceeding a certain value of loss, e.g. the expected 500 year loss equals $53M or 39% of the building replacement cost; the expected Average Annual Loss (AAL) equal to $0.6M or 0.46% of the building replacement cost; and loss exceedance rates, e.g. a loss of 10% building replacement cost or $13.5M has an exceedance rate of 95 years. The use of these results to benchmark the performance of the archetype tall building against the design intent in current building codes and to assess the impact of structural retrofit or other building enhancements is discussed.

Type: Proceedings paper
Title: Risk-based seismic performance assessment of existing tall steel-framed buildings in San Francisco
Event: SECED 2015 Conference: Earthquake Risk and Engineering towards a Resilient World
Location: Cambridge, UK
Dates: 09 July 2015 - 10 July 2015
Open access status: An open access version is available from UCL Discovery
Publisher version: https://www.seced.org.uk/index.php/search/12-vulne...
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10077051
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