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隔震结构是最为常见的减震方式之一,通过设置隔震层可以有效减小上部结构的地震反应,但同时隔震层也将承担较大的位移反应,这往往成为隔震结构设计时的主要限制因素。通过在隔震结构上加装调谐质量阻尼器(TMD)可以在一定程度上减小隔震层的位移反应,但是其减震效果受到质量比的限制。基于此,本文拟对一种新型的惯性减振装置(旋转惯性双重调谐质量阻尼器(RIDTMD))和基础隔震混合控制结构进行地震作用下的响应分析。RIDTMD在传统的弹簧单元和阻尼单元外又加入了质量单元,利用质量单元的旋转惯性进行减震,从而实现较大的表观质量,使减震效率和鲁棒性均有所提高。以某8层基础隔震结构为算例,研究了RIDTMD对混合控制体系控制效果的影响,并对TMD与惯性减振装置在隔震结构中的减震效果进行了比较。
Isolation structure is one of the most common ways to reduce vibration. By setting the isolation layer, the seismic response of the superstructure can be effectively reduced. At the same time, the isolation layer will also bear a larger displacement response, which often becomes the design of the isolation structure The main limiting factor. By installing the Tuned Mass Damper (TMD) on the isolated structure, the displacement response of the isolation layer can be reduced to a certain extent, but the damping effect is limited by the mass ratio. Based on this, this paper proposes a seismic response analysis of a new type of inertial vibration reduction device (RIDTMD) and a base-isolated hybrid control structure. The RIDTMD incorporates a mass unit into the traditional spring unit and damping unit, which uses the rotational inertia of the mass unit to reduce vibration, resulting in a larger apparent mass and improved damping efficiency and robustness. Taking an 8-story base isolation structure as an example, the influence of RIDTMD on the control performance of hybrid control system was studied. The damping effect of TMD and inertial vibration reduction device in isolated structure was compared.