Computationally Efficient Vector-Valued Seismic Risk Analysis of Engineering Structures

Abstract

AbstractProbabilistic seismic risk analysis (SRA) is often used for accurately quantifying seismic risk of critical engineering structures. It combines the probabilistic model of the behavior of structural response given a ground motion parameter (GMP) (e.g., seismic fragility model) and the probabilistic seismic hazard analysis (PSHA) for the GMP in a mathematically rigorous manner. In current engineering practice, SRA is performed based on a single GMP. For structures whose responses can be better predicted using multiple GMPs, a vector-valued SRA (VSRA) gives more accurate estimates of risk. However, due to the extensive computational efforts required for the multiple-dimensional cases, VSRA has not been widely applied in engineering practice. This paper presents a simplified approach to VSRA, which can substantially improve computational efficiency without losing accuracy. A new seismic hazard deaggregation procedure is proposed to determine a set of controlling earthquakes in terms of magnitude, sour...