EVALUATION OF THE EFFECT OF MASONRY INFILLS ON RESPONSE OF RC BULDINGS EQUIPPED WITH FPS DEVICES: A CASE STUDY

The assessment of existing structures and infrastructures located in areas with a relevant seismic hazard is one of the challenges for engineers over the last years. With reference to buildings built during 60's and 70's, most of them was realized as reinforced concrete (RC) framed structures disregarding seismic design issues in comparison to the current specifications. In order to enhance the seismic response to seismic actions of existing RC structures, over the years, the isolation system adopting friction pendulum (FP) devices turned out to be one of the most diffused. The aim of this work is to investigate the influence of the retrofitting intervention performed using single-concave friction pendulum devices (FPS) on the seismic response on an existing framed reinforced concrete building located in high seismicity region. The existing building presents both in plane and in elevation irregularities also related to the masonry infills. The effect of the masonry infills on the performance of the building is evaluated in probabilistic terms and useful recommendations for assessment of such kind of structures are reported.