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  • FEM SIMULATIONS OF A NEW HYSTERETIC DAMPER: THE DISSIPATIVE COLUMN

    A new replaceable hysteretic damper to better control seismic building damage, consisting of two adjacent steel vertical elements connected to each other with continuous X-shaped mild/low strength steel shear links, is investigated in this study. New Dampers, called Dissipative Columns (DC), provide additional stiffness and damping to a lateral system by using a basic and minimally invasive construction element: the column. The Dissipative Column has been conceived or as a device installed within a frame either external damper to provide macro-dissipation. In fact, considering different configurations, a parametric analysis, based on FEM simulations, is developed in order to evaluate the effect of the main geometrical and structural parameters as well as provide the design capacity curves of this new damper. In particular, non-linear pushover and cyclic analyses have been carried out in ABAQUS in order to characterize the local and global behaviour of the device also considering different steel grades. 

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  • Energia assorbita e tecniche di consolidamento antisismico di edifici in muratura

    During the last 15 years 18 simple masonry systems, scaled 1:2 and 1:1, have been tested by using a shaking table. The masonry systems were of different geometrical configurations and partly strengthened by various techniques, including hysteretic devices. For each masonry system and each shaking absorbed energies have been computed from recorded response signals and appropriate indices have been worked out in order to allow comparisons. These point out the positive effect induced by horizontal tendons in allowing a regular evolution of the response, without sudden stiffness decreases and the efficiency of hysteretic devices to control damage and increase available ductility.

    This paper is available in Italian only