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Experimental assessment of the CAM and DIS-CAM systems for the seismic upgrading of monumental masonry buildings
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2009
Year
EngineeringMasonry StructuresArchitectural EngineeringSeismic UpgradingStructural ApplicationStructural PerformanceMonumental Masonry BuildingsStructural SystemStructural SteelStructural EngineeringSeismic AnalysisEarthquake EngineeringDis-cam SystemsStructural Health MonitoringStructural DesignCam SystemTrema ProjectCivil EngineeringSeismic IsolationSicilian ChurchStructural MechanicsConstruction Engineering
The need of compacting masonry in its plan and improving transverse connections to get good seismic behaviours suggests the idea of using a three-dimensional tie system for the upgrading of existing masonry structures. In the CAM system (Active Confinement of Masonry), the ties are made of stainless steel ribbons. They are pre-tensioned, thus applying a light and favourable pre-compression state in masonry. Using special connection elements, it is possible to realise a continuous horizontal and vertical tie system that reduces the vulnerability of masonry, improving shear and flexural strength and ductility of masonry elements and applying an effective transverse connection between vertical layers. The paper describes the results obtained by an extensive experimental program carried out within the TREMA project on masonry elements and scaled structures made with typical materials and techniques of old masonry buildings, reinforced with the CAM system. The preliminary numerical studies of a new reinforcing system for monumental buildings realised by coupling CAM with hysteretic elements is here also presented. shaking table tests have been carried on two identical 3D masonry 2:3-scale models. These buildings have been designed and constructed according to the old traditional practice of the Italian Central and Southern Apennine zone. The first model has been strengthened with the CAM system and tested to verify the effectiveness of the proposed system. The second model has been tested up to the collapse without any strengthening. Finally, an evolution of the CAM seismic upgrading technique, called DIS-CAM (Dolce & Di Croce 2007, Dolce et al. 2007), is described. The system combines the CAM reinforcement technique, applied on slender masonry panels, with the dissipation capacity of damper devices. In this paper, the results of preliminary numerical simulations analyses carried out on a 1:6 scaled structural model of the masonry tambour of a Sicilian church retrofitted with this system are presented.