Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Seismic Upgrading of Vertically Irregular Existing r.c. Frames by BRBs
In several earthquake-prone countries a large part of existing r.c. buildings had been designed before seismic codes entered into force and, therefore, considering gravity loads only. The lateral strength and stiffness of these structures are inadequate to sustain seismic action and their seismic response is aggravated by deficiencies due to vertical irregularity. In particular, the ratio of the demanded storey shear force to the lateral strength presents an irregular distribution along the height of the building. This promotes the development of a storey collapse mechanism. In this chapter, the insertion of Buckling Restrained Braces (BRBs) is proposed both for the seismic upgrading of r.c. frames designed for gravity loads and for the reduction of their vertical irregularity. The effectiveness of a design method previously proposed by the authors is investigated. The method is ruled by two parameters: the behaviour factor and the design storey drift. The design method is applied for the seismic retrofitting of a 6-storey r.c. frame considering the values of the ruling parameters in several combinations. Then, nonlinear dynamic analyses are performed to assess their influence on the seismic response of the upgraded frames.
Seismic Upgrading of Vertically Irregular Existing r.c. Frames by BRBs
In several earthquake-prone countries a large part of existing r.c. buildings had been designed before seismic codes entered into force and, therefore, considering gravity loads only. The lateral strength and stiffness of these structures are inadequate to sustain seismic action and their seismic response is aggravated by deficiencies due to vertical irregularity. In particular, the ratio of the demanded storey shear force to the lateral strength presents an irregular distribution along the height of the building. This promotes the development of a storey collapse mechanism. In this chapter, the insertion of Buckling Restrained Braces (BRBs) is proposed both for the seismic upgrading of r.c. frames designed for gravity loads and for the reduction of their vertical irregularity. The effectiveness of a design method previously proposed by the authors is investigated. The method is ruled by two parameters: the behaviour factor and the design storey drift. The design method is applied for the seismic retrofitting of a 6-storey r.c. frame considering the values of the ruling parameters in several combinations. Then, nonlinear dynamic analyses are performed to assess their influence on the seismic response of the upgraded frames.
Seismic Upgrading of Vertically Irregular Existing r.c. Frames by BRBs
Geotechnical, Geological
Zembaty, Zbigniew (Herausgeber:in) / De Stefano, Mario (Herausgeber:in) / Barbagallo, Francesca (Autor:in) / Bosco, Melina (Autor:in) / Marino, Edoardo M. (Autor:in) / Rossi, Pier Paolo (Autor:in) / Stramondo, Paola R. (Autor:in)
Seismic Behaviour and Design of Irregular and Complex Civil Structures II ; Kapitel: 16 ; 181-192
01.01.2016
12 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Seismic upgrading , Design method , Buckling restrained braces , Vertical irregularity<index-term><term>Vertical irregularity</term></index-term> , r.c structures Engineering , Civil Engineering , Geotechnical Engineering & Applied Earth Sciences , Vibration, Dynamical Systems, Control , Earth and Environmental Science
Seismic Upgrading of Vertically Irregular Existing r.c. Frames by BRBs
| British Library Conference Proceedings | 2016