Traditional and viscous dissipative steel braced top addition strategies for a R/C building
by Stefano Sorace; Gloria Terenzi; Mattia Licari
International Journal of Structural Engineering (IJSTRUCTE), Vol. 6, No. 4, 2015

Abstract: A study concerning a double-storey extension on top of an existing reinforced concrete (R/C) apartment building is carried out for two different steel structural solutions. A traditional bracing configuration, and a dissipative bracing technology incorporating pressurised fluid viscous spring-dampers, are selected for the two hypotheses. The gravity load-bearing system is assumed to be coincident, in order to directly compare the seismic response capacities of the bracing systems. Furthermore, the following mutual design objectives are fixed: attaining operational, and immediate occupancy non-structural performance levels at frequent design earthquake and serviceability design earthquake levels, respectively; and limiting strengthening interventions on the R/C structure to jacketing maximum 20% of columns, and adding a thin R%C slab over the foundations. These objectives are reached at virtually coinciding costs. On the other hand, the viscous-dissipative bracing design shows substantially higher seismic performance at basic design and maximum considered earthquake levels, as well as lower architectural intrusion, as compared to the traditional bracing solution.

Online publication date: Wed, 14-Oct-2015

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