The paper illustrates the seismic retrofit carried out on an existing school building located in Italy by means of dissipating steel braces. The preliminary investigations, the design project, the construction process and, eventually, the seismic response of the retrofitted building were presented. At first, the manuscript reports the comprehensive study on the seismic vulnerability of the existing reinforced concrete framed building. Many deficiencies consisting in improper detailing, poor quality of materials and inadequate ductility were found. Furthermore, the torsional effects in this plan irregular building due to the L-shape floor plans were evidenced. Then, the paper illustrates the displacement-based design procedure of supplemental energy dissipation devices for seismic retrofit. Both buckling-restrained axial dampers and steel hysteretic dampers were considered for seismic upgrading of the reinforced concrete frame building. The effectiveness and reliability of the adopted seismic retrofitting technique and design approach were finally investigated using comprehensive nonlinear static and dynamic analyses.
Seismic retrofit of a reinforced concrete school building using dissipative steel braces
FERRAIOLI, Massimiliano;MANDARA, Alberto
2017
Abstract
The paper illustrates the seismic retrofit carried out on an existing school building located in Italy by means of dissipating steel braces. The preliminary investigations, the design project, the construction process and, eventually, the seismic response of the retrofitted building were presented. At first, the manuscript reports the comprehensive study on the seismic vulnerability of the existing reinforced concrete framed building. Many deficiencies consisting in improper detailing, poor quality of materials and inadequate ductility were found. Furthermore, the torsional effects in this plan irregular building due to the L-shape floor plans were evidenced. Then, the paper illustrates the displacement-based design procedure of supplemental energy dissipation devices for seismic retrofit. Both buckling-restrained axial dampers and steel hysteretic dampers were considered for seismic upgrading of the reinforced concrete frame building. The effectiveness and reliability of the adopted seismic retrofitting technique and design approach were finally investigated using comprehensive nonlinear static and dynamic analyses.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
