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

本文提出了一种创新的抗震设备，用于控制具有传统拉杆的砌体墙的平面外摇摆运动，该设备称为LInear混合滚动摇摆设备（LICORD）。LICORD是一种低冲击力的箱体，与传统拉杆的末端相连，旨在减轻中高强度地震的晃动。此外，本文通过对由粘土砖和水泥砂浆组成的砖石标本进行的广泛实验活动的结果的解释，拓宽了对摇摆墙动力特性的了解。首先，对LICORD的单个组件进行测试以识别其刚度和阻尼特性。其次，自由振动测试提供了独立式墙和受LICORD约束的墙的恢复系数的实际值，壁的高度与厚度之比有所变化。对于较厚的墙，实验/分析复原系数的比率从88％到98％不等，而对于细长的墙，结果的分散程度较小，最小值为95％，最大值为96％。受约束的墙的特征在于，其恢复系数要比无约束墙的恢复系数小5％至25％，这取决于减震器的等效粘性系数。此外，LICORD证明可以适当吸收和衰减壁的振动并控制其摇摆运动，从而极大地减少了撞击次数，并将旋转幅度降低了70％。还考虑了单侧运动对恢复系数评估的影响。