EARTHQUAKE LOSS ASSESSMENT OF STEEL FRAME BUILDINGS DESIGNED IN HIGHLY SEISMIC REGIONS

Abstract eng:
In recent years, there is an increasing need to quantify earthquake-induced losses throughout the expected life of a building in order to evaluate alternative design options and to minimize repairs in the aftermath of an earthquake. For this reason, the next generation of performance-based earthquake engineering evaluation procedures has formalized procedures that assess several metrics of seismic performance including economic losses. This paper discusses an analytical study that quantifies the expected earthquake-induced losses in typical office steel buildings designed with perimeter special moment frames or perimeter concentrically braced frames at various ground motion intensities. These buildings are designed in urban California in accordance with today’s seismic design provisions in North America. The expected economic losses associated with repair are computed based on a refined performance-based earthquake engineering framework developed within the Pacific Earthquake Engineering Research (PEER) center. This framework integrates site-specific seismic hazard, state-of-the-art nonlinear models that incorporate complex deteriorating phenomena of the structural components of a steel frame building, fragility curves of structural and nonstructural components that express the probability of being or exceeding a specific damage level, and the resulting repair costs. The effect of residual deformations along the height of steel frame buildings on their earthquake losses is also examined. It is shown that repair costs in the aftermath of earthquakes vary significantly depending on the employed lateral load resisting system, as well as the analytical model representation of the steel frame building itself.

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