This study evaluates the seismic risk of weak first-story reinforced concrete (RC) structures retrofitted with inerter dampers at their ground level when subjected to narrow-band seismic excitations. The main advantages brought about by the ground-level inerters are the reductions in seismic demands (e.g., drifts, floor accelerations). This study shows that structures with inerters are reliable systems in terms of peak story drifts for large ground motions. For moderate ground-motion intensities, the opposite could occur, mainly for soft soil sites. The reliabilities of structures with inerter dampers at their ground level are in general higher for buildings under seismic intensities associated to limit state of incipient collapse, especially for low-height buildings. This could be reversed for intensities associated to the limit state of damage limitation. The findings of this study could guide practicing engineers to use inerter-based dampers in retrofitting ductile structures consisting of moment-resisting reinforced concrete (RC) frames subjected to narrow-band earthquake excitations in regions such as Mexico City.
Abstract. The aim of this paper is the assessment of the wind generation influence on the voltage quality. A simple network has been simulated by PSS/E [1].The short circuit behaviour of the wind turbines has been analysed by means of simulation. To achieve it, several studies have been carried out. The purpose of these studies is to select the best options to modify the existing network as adding substations, branches, transformers, as well as calculate correctly the influence of the wind generation on power quality.
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