Effect of Interaction Between Primary and Secondary Systems on Floor Response Spectra

Abstract eng:
A parametric study on the interaction between primary structure and secondary components is presented in this paper. A simplified model of multi-story buildings is used to model the primary structure. The secondary component is modeled as a single degree of freedom object with known period of vibration, mass and damping ratio. A formulation already developed in another study has been employed to compute floor response spectrum of components that their characteristics affect the response of the primary structure. The advantage of this method to other proposed methods is that the primary structure is modeled as an MDOF which can capture higher mode effects. Effect of secondary component with different mass ratios on modified acceleration transfer functions of different modes of the primary structures as well as the secondary component has been shown. The ranges of mass ratios where the interaction can be ignored have also been presented. Effect of location of the secondary component has also been presented. The building models have been subjected to white noise as well as filtered white noise and floor response spectra for different mass ratios mounted at different heights of the primary structures have been investigated. KEYRORDS: interaction, secondary systems, transfer function, mass ratio, floor response spectrum

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