Seismic Safety: 10‐Story UBC Designed Steel Building

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Abstract
In evaluating the seismic safety of a 10‐story Uniform Building Code‐designed steel moment‐resisting building, three major sources of uncertainty have been extensively examined: (1) The representation of earthquake environment; (2) the structural dynamic properties; and (3) the method of structural analysis. By combining these uncertainties, the reliability of local inelastic response conditional on the peak ground acceleration is assessed for the frame. The overall seismic safety is investigated by introducing the site‐specific seismic risk. Based on the annual local ductility exceedance probability for each story, approximate bounds are established on the “system reliability” of the example building. Using empirical relationship between structural and nonstructural damage and local ductility ratio, the annual risk of damages due to future earthquakes is investigated for the steel frame.

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