Seismic Design of Secondary Systems

The ever increasing demand of providing accurate yet practical solution to the problem of seismic analysis of secondary system in industrial units has led to the development of some very novel analytical techniques. The paper describes the evolution of the methods which have been used to analyze the secondary systems in the past two decades. The developments starting with the direct generation of floor response spectra up to the recent introduction of the cross floor response spectra as the seismic inputs for the analysis of multiply supported secondary systems are discussed. lately, significant research efforts have also been directed to incorporate the effect of the dynamic interaction between the primary and secondary systems in their analyses. The latest developments in this area, utilizing the component mode synthesis approaches, are also described.

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