Next‐Generation Seismic Performance Assessment Through Multi‐Component Ground Motion Compatible Intensifying Artificial Acceleration

ABSTRACT Despite the crucial need for fully quantitative risk assessment of large‐scale structures, their performance is typically assessed through deterministic or semi‐quantitative approaches. The main preventing factor is the computational burden of probabilistic seismic analyses. This paper proposes a fast and accurate method that combines the capabilities of Incremental Dynamic Analysis (IDA) and endurance time methods. The method is based on intensifying artificial acceleration (IAA), which is generated based on meta‐features such as spectral ordinates, nonlinear response, and hysteretic energy present in real ground motion. The IAA aims to estimate the incremental response of the structure, similar to the IDA method, but using only a single simulation. The proposed IAA method is applied to a benchmark dam and is compared to single‐record IDA for various types of foundation‐structure interaction assumptions, as well as for linear and nonlinear systems. Differences between multicomponent IAA and IDA in terms of drift and damage index are quantified using ten similarity and distance metrics. The findings demonstrate promising compatibility between IAA and IDA, while the former reduces computational time by up to 90%.