Experimental estimation of energy dissipation in rocking masonry walls restrained by an innovative seismic dissipator (LICORD)

Abstract This paper presents an innovative anti-seismic device for controlling the out-of-plane rocking motion of masonry walls with traditional tie-rods, called LInear COntrolled Rocking Device (LICORD). LICORD is a low-impact box connected to extremity tie-rod designed mitigate medium–high intensity earthquakes. Additionally, widens knowledge about dynamic behavior through interpretation results extensive experimental campaign performed on specimens composed by clay brick and cementitious mortar. Firstly, LICORD’s single components are tested identify their stiffness damping properties. Secondly, free vibration tests provide actual values coefficients restitution free-standing restrained LICORD, where vary height thickness ratio. For stockier wall, ratio experimental/analytical coefficient varies from 88 98%, whereas slender less scattered, minimum value 95% maximum 96%. The characterized 5 25% than found unrestrained walls, depending equivalent viscous shock absorbers. Moreover, demonstrated properly absorb damp oscillations wall control its motion, strongly reducing number impacts rotation amplitudes up 70%. Considerations effect one-sided assessment also given. observed be range 4% (unrestrained wall) 7–20% LICORD.