Effect of dampers on the seismic performance of masonry walls assessed through fragility and demand hazard curves

In a damage avoidance design perspective, seismic rocking of rigid-like blocks, such as masonry walls, precast r.c./timber panels, art objects, etc., can be controlled through viscous elastic dampers. This paper discusses how to perform risk assessment walls undamped and damped by viscous-elastic dampers installed at the top them. Firstly, preliminary fragility analysis allows understanding role damper, whose coupling with recentering component attenuates motion, increases rotation frequency and, in some cases, impedes overturning compared case. Secondly, is made developing multiple stripe compute univariate curves combining uplift, probability exceedance. Thirdly, demand hazard are obtained for two representative buildings monumental structures an Italian site high seismicity. The PSHA results show remarkable reduction ultimate limit states, which annual exceedance rate respectively one orders magnitude lower than