This paper proposes a design procedure for seismic retrofit of reinforced concrete buildings using steel dampers. The proposed design method permits the peak seismic response to be predicted, as well as the dampers to be added to the structure to obtain a uniform distribution of the ductility demand. The design procedure is based on the nonlinear static analysis, the trilinear idealization of the story pushover curves, and the equivalent linearization of the sin-gle-degree-of-freedom (SDOF) system equivalent to the RC frame. The SDOF system, equiva-lent to the damped braces, is designed to meet performance criteria based on a target drift an-gle. An optimal damper distribution rule is used to distribute the damped braces along with the height to maximize the use of all dampers and obtain a uniform distribution of the ductility demand. The proposed design procedure is applied to a real complex real case study: an eight-story reinforced concrete residential building equipped with buckling-restrained braces. Its effectiveness is finally demonstrated through nonlinear dynamic performance verifications.
A DESIGN PROCEDURE OF STEEL DAMPERS FOR SEISMIC RETROFIT OF REINFORCED CONCRETE BUILDINGS
Massimiliano Ferraioli;Alberto Mandara;
2022
Abstract
This paper proposes a design procedure for seismic retrofit of reinforced concrete buildings using steel dampers. The proposed design method permits the peak seismic response to be predicted, as well as the dampers to be added to the structure to obtain a uniform distribution of the ductility demand. The design procedure is based on the nonlinear static analysis, the trilinear idealization of the story pushover curves, and the equivalent linearization of the sin-gle-degree-of-freedom (SDOF) system equivalent to the RC frame. The SDOF system, equiva-lent to the damped braces, is designed to meet performance criteria based on a target drift an-gle. An optimal damper distribution rule is used to distribute the damped braces along with the height to maximize the use of all dampers and obtain a uniform distribution of the ductility demand. The proposed design procedure is applied to a real complex real case study: an eight-story reinforced concrete residential building equipped with buckling-restrained braces. Its effectiveness is finally demonstrated through nonlinear dynamic performance verifications.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
