The main objective of this work is to define an analytical formulation to evaluating the increase in structural factor due to the addition of hysteretic dissipation systems to an existing reinforced concrete framed structure in order to characterize rules to supply q-values. This would enable the use of linear elastic methods in the evaluation of seismic loading also for retrofitted structures. In this paper, the results of a parametric study of non linear analyses performed on different types of R/C buildings strengthened by means of Hysteretic Energy Dissipating Bracing (EDB's), are reported. The selected R/C buildings are representative of seventies/eighties Italian buildings, designed for vertical load only, upgraded considering different design parameter and configuration of the EDB system. A Displacement-Focus Design (DFD) procedure compatible with Italian and European seismic code [NTC08, 2008; EC8-1, 2004] has been considered to evaluate the mechanical characteristics of the dissipating devices, with the purpose of limiting the inter-storey drifts after a target drift.
Q-factors of reinforced concrete structures retrofitted with hysteretic energy dissipating bracing system.
DI CESARE, ANTONIO;PONZO, Felice Carlo;AULETTA, GIANLUCA
2012-01-01
Abstract
The main objective of this work is to define an analytical formulation to evaluating the increase in structural factor due to the addition of hysteretic dissipation systems to an existing reinforced concrete framed structure in order to characterize rules to supply q-values. This would enable the use of linear elastic methods in the evaluation of seismic loading also for retrofitted structures. In this paper, the results of a parametric study of non linear analyses performed on different types of R/C buildings strengthened by means of Hysteretic Energy Dissipating Bracing (EDB's), are reported. The selected R/C buildings are representative of seventies/eighties Italian buildings, designed for vertical load only, upgraded considering different design parameter and configuration of the EDB system. A Displacement-Focus Design (DFD) procedure compatible with Italian and European seismic code [NTC08, 2008; EC8-1, 2004] has been considered to evaluate the mechanical characteristics of the dissipating devices, with the purpose of limiting the inter-storey drifts after a target drift.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
