Existing reinforced concrete frame buildings with non-ductile detailing suffered severe damage and caused loss of life during earthquakes. Different rehabilitation systems have been developed to upgrade the seismic performance of this kind of structures. The research discussed in this paper deals with the seismic upgrading of frame structures, in particular for the application presented buckling restrained steel braces (BRB) have been selected. A displacement-based procedure to design dissipative bracing for the seismic protection of frame structures, together with an optimization criteria for the bracing, is proposed and some applications are discussed. The procedure does not require sophisticated dynamic nonlinear analyses but only common non linear static analyses: it is based on the displacement based design and using the capacity spectrum method. Two performance objective have been considered developing the procedure: to protect the structure against structural damage or collapse and avoid non-structural damage.This latter is done limiting global displacements and interstorey drifts. Finally the procedure has been applied to some case studies and existing r.c. frames both 2D and 3D.
Bergami, A.V., Nuti, C. (2012). Seismic upgrading of structures: a design procedure for dissipative buckling restrained braces. In Conference Proceedings.
Seismic upgrading of structures: a design procedure for dissipative buckling restrained braces
BERGAMI, ALESSANDRO VITTORIO;NUTI, CAMILLO
2012-01-01
Abstract
Existing reinforced concrete frame buildings with non-ductile detailing suffered severe damage and caused loss of life during earthquakes. Different rehabilitation systems have been developed to upgrade the seismic performance of this kind of structures. The research discussed in this paper deals with the seismic upgrading of frame structures, in particular for the application presented buckling restrained steel braces (BRB) have been selected. A displacement-based procedure to design dissipative bracing for the seismic protection of frame structures, together with an optimization criteria for the bracing, is proposed and some applications are discussed. The procedure does not require sophisticated dynamic nonlinear analyses but only common non linear static analyses: it is based on the displacement based design and using the capacity spectrum method. Two performance objective have been considered developing the procedure: to protect the structure against structural damage or collapse and avoid non-structural damage.This latter is done limiting global displacements and interstorey drifts. Finally the procedure has been applied to some case studies and existing r.c. frames both 2D and 3D.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
