This paper investigates the design of new or existing structures equipped with hysteretic dissipation devices by using simplified nonlinear analysis based on the definition of the strength reduction factor. In this paper a plane reinforced concrete frame retrofitted by means of properly designed dissipative braces is analysed. In particular, two different conditions are considered: when the bare frame behaves elastically or inelastically. The bare frame and the strengthened frame are subjected to nonlinear static analysis in order to obtain the corresponding strength reduction factor. This simple study is repeated varying the brace mechanical properties in order to investigate the effects on the strength reduction factor. The N2 method is employed to propose a procedure to follow in order to perform strength and ductile checks of the braced system. Finally some hints are given with respect to the possibility of design with equivalent damping and stiffness, according to the American guidelines FEMA 273 and 274.
Simplified nonlinear analysis: application to damper-braced structures / Nuzzo, I.; Losanno, D.; Serino, G.; Bozzo, L. M.. - (2015). (Intervento presentato al convegno 15th International Conference on Civil, Structural and Environmental Engineering Computing tenutosi a Prague (Czech Rep.) nel 1-4 September 2015).
Simplified nonlinear analysis: application to damper-braced structures
Nuzzo I.;Losanno D.;Serino G.;
2015
Abstract
This paper investigates the design of new or existing structures equipped with hysteretic dissipation devices by using simplified nonlinear analysis based on the definition of the strength reduction factor. In this paper a plane reinforced concrete frame retrofitted by means of properly designed dissipative braces is analysed. In particular, two different conditions are considered: when the bare frame behaves elastically or inelastically. The bare frame and the strengthened frame are subjected to nonlinear static analysis in order to obtain the corresponding strength reduction factor. This simple study is repeated varying the brace mechanical properties in order to investigate the effects on the strength reduction factor. The N2 method is employed to propose a procedure to follow in order to perform strength and ductile checks of the braced system. Finally some hints are given with respect to the possibility of design with equivalent damping and stiffness, according to the American guidelines FEMA 273 and 274.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
