YesEarthquake response spectrum is the most popular tool in the seismic analysis and design of\ud structures. In the case of combined primary-secondary (P-S) systems, the response of the supporting P\ud substructure is generally evaluated without considering the S substructure, which in turn is only required\ud to bear displacements and/or forces imposed by the P substructure (¿cascade¿ approach). In doing so,\ud however, dynamic interaction between the P and S components is neglected, and the seismic-induced\ud response of the S substructure may be heavily underestimated or overestimated. In this paper, a novel\ud CQC (Complete Quadratic Combination) rule is proposed for the seismic response of linear light S\ud substructures attached to linear P substructures. The proposed technique overcomes the drawbacks of the\ud cascade approach by including the effects of dynamic interaction and different damping in the\ud substructures directly in the cross-correlation coefficients. The computational effort is reduced by using\ud the eigenproperties of the decoupled substructures and only one earthquake response spectrum for a\ud reference value of the damping ratio
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