A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
A simplified design procedure for seismic upgrade of frame structures equipped with hysteretic dampers
Highlights A displacement-based design procedure for seismic upgrade of flexible frames. The equivalent SDOF damper brace is identified via the capacity spectrum approach. Proportionality criterion is adopted for distributing damper stiffness and strength. Reliability of the method to achieve the target displacement is proven by examples. The target displacement is defined to limit the drift of the weak story.
Abstract This paper presents a simple and affordable design procedure for the seismic upgrade of frame structures equipped with hysteretic dampers. The proposed framework is aimed at leading the designer to proportion the damper device(s)) in order to achieve a desired structural performance level. According to the method, the structural system composed by frame and dampers is replaced by an equivalent Single Degree of Freedom (SDOF) system, characterized through its secant stiffness and equivalent viscous damping, both defined in relation to a “performance point” which is assigned on the basis of the allowable damage of the frame and on the first mode deformation of the main structure. The global stiffness and strength of the equivalent SDOF system are then distributed along the height of the frame according to a stiffness-proportionality criterion, and the properties of the damper units are calculated depending on the chosen layout. Two case-studies relevant to as many reinforced concrete frames are provided to demonstrate the effectiveness of the suggested procedure, obtaining a satisfactory agreement between the design target and numerical capacity curves. Non-linear dynamic analyses are further performed to assess the reliability of the methodology.
A simplified design procedure for seismic upgrade of frame structures equipped with hysteretic dampers
Highlights A displacement-based design procedure for seismic upgrade of flexible frames. The equivalent SDOF damper brace is identified via the capacity spectrum approach. Proportionality criterion is adopted for distributing damper stiffness and strength. Reliability of the method to achieve the target displacement is proven by examples. The target displacement is defined to limit the drift of the weak story.
Abstract This paper presents a simple and affordable design procedure for the seismic upgrade of frame structures equipped with hysteretic dampers. The proposed framework is aimed at leading the designer to proportion the damper device(s)) in order to achieve a desired structural performance level. According to the method, the structural system composed by frame and dampers is replaced by an equivalent Single Degree of Freedom (SDOF) system, characterized through its secant stiffness and equivalent viscous damping, both defined in relation to a “performance point” which is assigned on the basis of the allowable damage of the frame and on the first mode deformation of the main structure. The global stiffness and strength of the equivalent SDOF system are then distributed along the height of the frame according to a stiffness-proportionality criterion, and the properties of the damper units are calculated depending on the chosen layout. Two case-studies relevant to as many reinforced concrete frames are provided to demonstrate the effectiveness of the suggested procedure, obtaining a satisfactory agreement between the design target and numerical capacity curves. Non-linear dynamic analyses are further performed to assess the reliability of the methodology.
A simplified design procedure for seismic upgrade of frame structures equipped with hysteretic dampers
Bruschi, Eleonora (author) / Quaglini, Virginio (author) / Calvi, Paolo M. (author)
Engineering Structures ; 251
2021-10-24
Article (Journal)
Electronic Resource
English
PERFORMANCE BASED SEISMIC DESIGN OF STRUCTURES EQUIPPED WITH HYSTERETIC DAMPERS
| British Library Conference Proceedings | 2005
Simplified seismic design approach for steel portal frame piers with hysteretic dampers
| Online Contents | 2007
| DOAJ | 2020