In this paper, the introduction of Buckling Restrained Braces (BRBs) is proposed for the seismic rehabilitation of existing r.c. framed structures. Furthermore, a procedure for the design of BRBs is presented. According to this procedure, BRBs are designed to fulfil both a stiffness and a strength requirement, in order to achieve the Significant Damage limit state in occurrence of seismic events having a 10% probability of exceedance in 50 years. The parameters that rule the design are the behaviour factor q and the design storey drift Dd. The effectiveness of the proposed method has been verified evaluating the seismic response of an r.c. frame upgraded by BRBs, which were designed using different pairs of values of d and q. The seismic response of the obtained frames has been assessed by nonlinear dynamic analysis, whose results demonstrate that the seismic performance of the upgraded frames is suitable as long as proper values of Dd and q are adopted.

Calibration of a design method for seismic upgrading of existing r.c. frames by BRBs

Barbagallo F;BOSCO, MELINA;GHERSI, Aurelio;MARINO, EDOARDO MICHELE;ROSSI, PIER PAOLO;Stramondo PR
2014

Abstract

In this paper, the introduction of Buckling Restrained Braces (BRBs) is proposed for the seismic rehabilitation of existing r.c. framed structures. Furthermore, a procedure for the design of BRBs is presented. According to this procedure, BRBs are designed to fulfil both a stiffness and a strength requirement, in order to achieve the Significant Damage limit state in occurrence of seismic events having a 10% probability of exceedance in 50 years. The parameters that rule the design are the behaviour factor q and the design storey drift Dd. The effectiveness of the proposed method has been verified evaluating the seismic response of an r.c. frame upgraded by BRBs, which were designed using different pairs of values of d and q. The seismic response of the obtained frames has been assessed by nonlinear dynamic analysis, whose results demonstrate that the seismic performance of the upgraded frames is suitable as long as proper values of Dd and q are adopted.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11769/74194
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