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C. Adam, P.A. Fotiu:
"Dynamic response of earthquake excited inelastic primary-secondary systems";
in: "Proc. of 12th World Conference on Earthquake Engineering (12WCEE)", New Zealand Society for Earthquake Engineering, 2000, ISBN: 0-9582154-0-5, Paper ID 0310, 8 pages.

The objective of the paper is to investigate numerically the effect of ductile material behavior on the response of coupled primary-secondary systems. The primary substructure is assumed as a four-storey frame building and elastic-plastic material behavior is considered in the form of a bilinear moment-curvature relation. The secondary structure is taken as a simple SDOF oscillator. Numerical studies are presented for elastic and ideally elastic-plastic SDOF oscillators with different yield levels. The coupled structure is excited by the north-south component of the El Centro earthquake sample. The investigations are performed at different excitation levels. In the examples presented tuning frequencies of the oscillator are varied. Acceleration response spectra of the main structure as well as floor response spectra are generated for various amounts of oscillator masses.