Preliminary Study on the Vibration Isolation of Two-dimensional Periodic Piles Applied to Lanzhou Zhongchuan International Airport
The traditional vibration isolation technology requires the installation of isolation devices between the substructure and the foundation,which reduces the structural integrity and restricts the device replacement.In order to avoid these disadvantages of traditional isolation technology,this paper introduces the new concept of shielding elastic waves by periodic structures.The two-dimensional(2D)periodic piles with bandgap characteristics are studied through numerical simulations.The design principles for structural parameters of the 2D periodic piles are summarized in detail.This technique is applied to the vibration isolation of the runways to terminal buildings in Lanzhou Zhongchuan International Airport,and the selection of the parameters of the 2D periodic piles structure is detected.It is found that for the relative stiffness of the selected materials,the periodic piles structures with unit cell composed of the outer steel scatter,the inner concrete scatter and the soil matrix have the widest attenuation range of elastic waves.By decreasing lattice constants and increasing the filling rate or by constructing the cell structures with two lattice constants,a wider attenuation frequency range of the periodic piles structure for elastic waves can be obtained.The results have provided a theoretical guidance for the design of periodic piles at Lanzhou Zhongchuan International Airport so as to accurately realize the vibration isolation for engineering structures.
vibration and wavetwo-dimensional phononic crystalsperiodic pilesstructural vibration isolationdispersion curvesLanzhou Zhongchuan international airport
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