Methodology for the assessment and refinement of friction-based dissipative devices

摘要

An innovative dissipative system for the seismic upgrade of historical buildings is presented. The system comprises a friction-based dissipative device able to provide energy dissipation capacity to connecting walls. To verify the compliance of the device's initial prototype with the relevant European Standards, a testing and design methodology is developed. This optimisation approach consists of: two tests loops, to identity the dependence of the dissipative device on bolt preloading, type of fasteners, frictional interfaces and environmental conditions; and a design loop where advanced 3D modelling and analysis are used to improve the design according to the experimental results. The performance is measured by variation of effective damping. This iterative procedure singles out parameters that need improvement and allows to produce two new prototypes, differing by shape and frictional interfaces. The revised prototypes prove to deliver a reliable response to cyclic loading, containing the variation of effective damping well within code requirements, even after exposure to adverse environmental conditions.