Abstract This work investigates the dynamic behaviour of a multi-storey frame building, assumed as the structure to be controlled, connected with an adjacent support structure by means of horizontal fluid viscous dampers. The dampers connection system has two main effects: (i) energy dissipation provided by the viscous dissipative forces, (ii) energy transfer between modes leading to modes coupling effects between the two buildings without a significant dissipation of energy. The relative contribution of the two effects is highly dependent on the main properties of the coupled system. To investigate this complex behaviour, first the minimal coupled dynamic system composed by two Single-Degree-Of-Freedom systems connected by a viscous damper is analysed. The theory of complex damping is used to determine complex frequencies and damping ratios, while analytical expressions of steady state response under harmonic excitation are determined to investigate the influence of the system parameters on the maximum dynamic amplifications. The seismic response is also investigated through a wide parametric study with the aim of evaluating the trends of the damping reduction factors with respect to the main dynamic parameters of the coupled system. Minimum values of the damping reduction factors and corresponding optimal damping coefficients are determined. Then, the analyses are extended to uniform multi-storey structures for which minimum damping reduction factors are provided for a wide range of the key system parameters. Comparisons between one-storey and uniform multi-storey systems are provided. The results can be useful for a preliminary design of the dampers connection system and for the evaluation of its effectiveness based on the fundamental dynamic properties of the connected buildings.

中文翻译：

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由流体粘性阻尼器连接的相邻建筑物的阻尼衰减系数

摘要 这项工作研究了多层框架建筑的动态行为，假设为要控制的结构，通过水平流体粘性阻尼器与相邻的支撑结构连接。阻尼器连接系统有两个主要作用：(i) 由粘性耗散力提供的能量耗散，(ii) 模式之间的能量传递导致两个建筑物之间的模式耦合效应，而没有显着的能量耗散。这两种效应的相对贡献高度依赖于耦合系统的主要特性。为了研究这种复杂的行为，首先分析了由粘性阻尼器连接的两个单自由度系统组成的最小耦合动态系统。复阻尼理论用于确定复频率和阻尼比，同时确定谐波激励下稳态响应的解析表达式，研究系统参数对最大动态放大倍数的影响。还通过广泛的参数研究来研究地震响应，目的是评估阻尼减少因子相对于耦合系统的主要动态参数的趋势。确定阻尼降低因子的最小值和相应的最佳阻尼系数。然后，将分析扩展到统一的多层结构，其中为广泛的关键系统参数提供了最小阻尼降低系数。提供了一层和统一的多层系统之间的比较。