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Dynamic response and optimal design of structures with large mass ratio TMD

机译：大质量比TMD结构的动力响应及优化设计

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摘要

This paper investigates the dynamic behavior and the seismic effectiveness of a non-conventional Tuned Mass Damper (TMD) with large mass ratio. Compared with conventional TMD, the device mass is increased up to be comparable with the mass of the structure to be protected, aiming at a better control performance. In order to avoid the introduction of an excessive additional weight, masses already present on the structure are converted into tuned masses, retaining structural or architectural functions beyond the mere control function. A reduced order model is introduced for design purposes and the optimal design of a large mass ratio TMD for seismic applications is then formulated. The design method is specifically developed to implement High-Damping Rubber Bearings (HDRB) to connect the device mass to the main structure, taking advantage of combining stiffness and noticeable damping characteristics. Ground acceleration is modeled as a Gaussian random process with white noise power spectral density. A numerical searching technique is used to obtain the optimal design parameter, the frequency ratio a, which minimizes the root-mean-square displacement response of the main structure. The study finally comprises shaking table tests on a 1:5 scale model under a wide selection of accelerograms, both artificial and natural, to assess the seismic effectiveness of the proposed large mass ratio TMD.
机译：本文研究了大质量比的非常规调谐质量阻尼器（TMD）的动力特性和抗震效果。与传统的TMD相比，器件的质量增加到与要保护的结构的质量相当，以实现更好的控制性能。为了避免引入过多的额外重量，将已经存在于结构上的质量转换为已调整的质量，从而保留了超出单纯控制功能的结构或建筑功能。引入降阶模型用于设计目的，然后制定用于地震应用的大质量比TMD的最佳设计。该设计方法是专门为实现高阻尼橡胶轴承（HDRB）而开发的，该方法利用了刚度和明显的阻尼特性，将设备质量连接到主体结构。地面加速度被建模为具有白噪声功率谱密度的高斯随机过程。使用数值搜索技术来获得最佳设计参数，即频率比a，该参数使主体结构的均方根位移响应最小。该研究最后包括在多种加速度计（包括人工和自然）下以1：5比例模型进行振动台测试，以评估拟议的大质量比TMD的抗震效果。

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