## 1 Editorial
The authors critically discuss the obtained results in view of the achievement of different performance requirements under different types of external excitation. In particular, large initial stiffness is useful to reduce micro-vibrations due to moving crane loads and wind loads, as well as during small or moderate earthquakes, while small final LRB stiffness is necessary to reduce the seismic displacements during strong earthquakes. It is found that the effectiveness of the seismic isolation is excellent for earthquakes with short dominant periods but it decreases with increasing the dominant periods. Since micro vibration is a major concern for high-tech factories, an appropriate design of LRBs should entail a large initial stiffness and a small ratio of the final stiffness over the initial stiffness. In paper [11], [PERSON] et al. develop a motion-based design method under uncertainty conditions for the vibration mitigation of stay cables under wind-induced vibrations. A robust design of the devices is carried out based on a constrained multi-objective optimization problem, wherein the a multi-objective function is defined in terms of characteristic parameters of the damping devices, and an inequality constraint is additionally included to guarantee an acceptable probability of failure of the structural system. Following the United States Federal Highway Administration guidelines, the design criterion is governed by the compliance of the vibration serviceability limit state, quantitatively indicated by a reliability index being greater than a threshold value. The performance of the proposed design method is numerically validated considering the longest stay cable of the Alamillo bridge (Spain)equipped with different passive damping devices, namely viscous, elastomeric and friction dampers. The proposed motion-based design method turns out to be more effective than a conventional method, by reducing the size and the budget of the devices, which facilitates its feasibility of implementation. In paper [12], [PERSON] et al. explore the effectiveness of shared tuned mass damper (STMD) in reducing seismic bounding of adjacent buildings. The authors carefully revisit the idea of STMD reported in a paper from the literature [_Earthq. Eng. Struct. Dyn._**2001**, _30_, 1185-1201]. In particular, they noted that, strictly speaking, such solution does not act like a shared tuned mass damper. Optimal parameters of the STMD are evaluated by minimizing the cost function using a genetic algorithm. Two optimal (tuning) parameters are found: the first solution corresponds to the device being tuned to one of the two buildings, thus being a classical TMD, and not a shared TMD; the second solution corresponds to a very stiff system, in which the TMD mass hardly moves, thus it is equivalent to a viscous connection between the two adjacent buildings. In the second solution, the TMD mass introduces no benefit while, counterproductively, it adds unnecessary load to the structure. Any reduction in response resulting from the STMD is due to the viscous coupling of the two buildings, rather than to the tuned vibration of the STMD mass. Based on the authors' study, the STMD strategy is not effective. This conclusion is obtained based on results from a large set of real earthquake ground motions, including 462 ground motion records from 110 earthquakes recorded in Europe and the Middle East. In paper [13], [PERSON] et al. develop an optimal passive actuation scheme of multibuilding systems composed of both interstory and interbuilding linear viscous dampers. Unlike other literature studies that are limited to one or at the most two adjacent buildings, the paper addresses a set of five identical planar frames. Optimization is carried out using a hybrid discrete-continuous formulation, based on Hoo objective function combined with genetic algorithm approaches and parallel computing techniques. The optimal position and the optimal damping coefficient of the devices are determined through the developed design procedure.