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http://dx.doi.org/10.12989/sem.2014.50.3.383

Equivalent modal damping ratios for non-classically damped hybrid steel concrete buildings with transitional storey  

Sivandi-Pour, Abbas (Faculty of Civil Engineering, Semnan University)
Gerami, Mohsen (Faculty of Civil Engineering, Semnan University)
Khodayarnezhad, Daryush (Faculty of Civil Engineering, Semnan University)
Publication Information
Structural Engineering and Mechanics / v.50, no.3, 2014 , pp. 383-401 More about this Journal
Abstract
Over the past years, hybrid building systems, consisting of reinforced concrete frames in bottom and steel frames in top are used as a cost-effective alternative to traditional structural steel or reinforced concrete constructions. Dynamic analysis of hybrid structures is usually a complex procedure due to various dynamic characteristics of each part, i.e. stiffness, mass and especially damping. In hybrid structures, one or more transitional stories with composite sections are used for better transition of lateral and gravity forces. The effect of transitional storey has been considered in no one of the studies in the field of hybrid structures damping. In this study, a method has been proposed to determining the equivalent modal damping ratios for hybrid steel-concrete buildings with transitional storey. In the proposed method, hybrid buildings are considered to have three structural systems, reinforced concrete, composite steel and concrete (transitional storey) and steel system. In this method, hybrid buildings are substituted appropriately with 3-DOF system.
Keywords
hybrid buildings; damping ratio; transitional storey; steel-concrete; non-classical damping; nonlinear analysis; main modes;
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