Abstract
In many countries around the world a huge number of existing reinforced concrete (RC) structures have been realized without account for seismic detailing, even if they are located in areas subjected to high seismicity. In this context, several passive seismic protection techniques have been developed and applied to retrofit these structures such as, for an example, seismic isolation. The aim of this work is to characterize in probabilistic terms the seismic performance of a framed RC building retrofitted by means of sliding friction pendulum (FPS) devices. Specifically, the response of an existing RC building located in a high seismicity area in Italy is investigated. After the description of the main available information about the structure, a non-linear numerical model has been defined by means of fiber-elements approach. Then, non-linear dynamic analyses considering multiple recorded ground motions with the three accelerometric components have been carried out to assess the seismic response of the building with and without the retrofitting intervention composed of FPS isolators. Finally, the results are processed to achieve a probabilistic assessment of the seismic performance of the retrofitting intervention.
Highlights
Nowadays, in many countries such as Italy, the assessment of existing structures and infrastructures [1] is a relevant issue and particular care should be pointed out to areas with a high seismic hazard
In order to improve the response to seismic actions of existing reinforced concrete (RC) buildings, over the years, the isolation system with friction pendulum (FP) devices have turned out to be one of the most efficient solutions [6]
The aim of this work is to investigate the influence of the retrofitting intervention composed of single-concave friction pendulum devices on the seismic response on an existing reinforced concrete building located in central Italy, which is widely recognized as an area characterized by a very high seismicity
Summary
In many countries such as Italy, the assessment of existing structures and infrastructures [1] is a relevant issue and particular care should be pointed out to areas with a high seismic hazard. Most of the existing constructions, in particular RC buildings, have been designed to withstand mainly gravity loads. In this context, the seismic assessment is very important to define the best retrofitting solution in order to upgrade the performance level of existing structures in line with modern codes and safety requirements [3] within the performance-based seismic design [4,5]. In order to improve the response to seismic actions of existing RC buildings, over the years, the isolation system with friction pendulum (FP) devices have turned out to be one of the most efficient solutions [6]. In the literature and in practice alternative strategies and philosophies aimed to improve the seismic response of buildings, in general, are proposed and discussed [7,8,9,10]
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