Seismic loss evaluation for structures in different geographic locations

Abstract

Direct economic and social losses associated with seismic hazards are evaluated for structures located in two different geographic locations with different seismicity characteristics. An optimized seismic performance-based design methodology considering structural and non-structural systems is considered. Seismic performance-based design of structures is an approach to design a structure to meet specific performance objectives subjected to earthquake ground motions of various seismic hazard levels. A multi-objective genetic algorithm is used to optimize the design of a steel moment-frame. Optimization objectives are to minimize lifetime economic cost calculated from the initial construction cost and expected annual loss (EAL) associated with direct economic loss, and direct social loss modeled as expected annual social loss (EASL). Specified confidence levels for certain performance objectives are set as constraints of the optimization problem. Inelastic time history analysis is used to evaluate structural response under different levels of earthquake hazard to obtain engineering demand parameters (such as inter-story drifts, etc.). Hazards-United States (Hazus) fragility functions are implemented for obtaining the probabilities of damage for the structural system and displacement-sensitive and acceleration-sensitive nonstructural components. To illustrate the effectiveness of the procedure, designs for a steel structure located in two geographic locations are presented and compared.

Publication Title

NCEE 2014 - 10th U.S. National Conference on Earthquake Engineering: Frontiers of Earthquake Engineering

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