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Structural Engineering and Mechanics Volume 50, Number 3, May10 2014 , pages 383-401 DOI: https://doi.org/10.12989/sem.2014.50.3.383 |
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Equivalent modal damping ratios for non-classically damped hybrid steel concrete buildings with transitional storey |
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Abbas Sivandi-Pour, Mohsen Gerami and Daryush Khodayarnezhad
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| 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. | ||
| Key Words | ||
| hybrid buildings; damping ratio; transitional storey; steel-concrete; non-classical damping; nonlinear analysis; main modes | ||
| Address | ||
| Abbas Sivandi-Pour, Mohsen Gerami and Daryush Khodayarnezhad : Faculty of Civil Engineering, Semnan University, Semnan, Iran | ||