Suspended building structures have inherent architectural aesthetics and are able to achieve low seismic-induced displacements of the primary structure and accelerations of the suspended segments. A recently proposed subtype of suspended building structures harnesses discrete prefabricated modules to overcome the fragility originating from inter-story drift within the suspended segment and to enhance the overall attenuation. This paper presents the first shake table experimental study of this subtype to directly evaluate its aseismic performance and develop a physics-based modeling strategy that is validated and therefore is reliable. For this purpose, 1:15 scaled shake table experiments of modularized suspended structures were conducted with three fundamental configurations. Each model in each configuration was subjected to at least five ground motions. Results indicate that displacements at the top of the primary structure are reduced by around 50%; in the structure with discrete modules and inter-story dampers, quicker decay was shown, accompanied by lower accelerations of the modules. The inter-story drift ratio of the suspended segment reached 3.75% under 0.12 g PGA excitation, indicating the potential of drift-induced fragility if a regular structure is adopted and proving the benefit of modularization. Numerical models of the tested structural systems have been developed in OpenSees platform. Simulated responses show satisfactory agreement with the measured ones. Subsequent parametric analyses reveal that the performance is sensitive to both the stiffness and damping values especially when the damper is of viscous type. Optimal stiffness facilitates tuning between the primary and secondary structures while optimal damping enhances dissipation notably. Moreover, it is observed that the inherent friction handicaps dissipation instead of facilitating it.

中文翻译：

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模块化悬空建筑系统的振动台测试和抗震性能计算研究

悬挂式建筑结构具有固有的建筑美感，并且能够实现低地震引起的主结构位移和悬挂段的加速度。最近提出的一种悬空建筑结构的子类型利用离散的预制模块来克服由于悬吊部分内的层间漂移引起的脆弱性并增强整体衰减。本文介绍了该子类型的第一个振动台实验研究，以直接评估其抗震性能并开发经过验证且因此可靠的基于物理的建模策略。为此，采用三种基本配置进行了模块化悬浮结构的1:15比例振动台实验。每个配置中的每个模型至少要经受五次地面运动。结果表明，一级结构顶部的位移减少了约50％；在具有离散模块和层间阻尼器的结构中，显示出更快的衰减，同时模块的加速度较低。在0.12 g PGA激发下，悬挂段的层间漂移率达到3.75％，这表明如果采用规则结构，则存在漂移引起的脆性的潜力，并证明了模块化的好处。已在OpenSees平台中开发了测试结构系统的数值模型。模拟的响应与测得的结果令人满意。随后的参数分析表明，性能对刚度和阻尼值都很敏感，特别是在阻尼器为粘性类型时。最佳刚度有助于在一级结构和二级结构之间进行调整，而最佳阻尼则可显着提高耗散率。而且，观察到固有摩擦阻碍了耗散而不是促进了耗散。