复杂截面周期性隔振桩带隙特性构型影响因素研究

提出带隙特性丰富的蜂窝截面、正交截面和X截面三种周期性隔振桩,采用平面波展开法对三种隔振桩进行频散及带隙分布展开研究,揭示平面内和平面外首阶完全带隙的起始频率、截止频率以及带宽随构型影响因素如周期常数、填充率以及控制尺寸变化的规律,为该类型排桩应用及设计选型提供理论依据.研究表明:降低周期常数可以增加三种隔振桩平面内和...

Study on Configuration Influencing Factors of Band Gap Characteristics of Vibration Isolation Periodic Piles with Complex Sections

Three new types of vibration isolation periodic piles with complex sections including honeycomb piles,orthogonal cross-bonding piles and X-type piles are proposed.The dispersions of three kinds of the isolation periodic piles are calculated based on plane wave expansion method.The influences of periodic constant,filling rate and control size of the piles on the initial frequency,truncation frequency and the variation law of the bandwidth in the cases of in-plane and out-of-plane vibrations are revealed.It provides a theoretical basis for the application and selection design of these types of periodic piles.The research results show that reducing the periodic constant can increase the band width of the initial completion band gap of inplane and out-of-plane vibrations,but also increase the lower bound frequency and upper bound frequency of the initial band gap.Increasing the filling rate can widen the band width of the initial completion band gap of the in-plane and out-of-plane vibrations of the honeycomb piles,as well as raise their lower bound frequency and upper bound frequency.The initial completion band gap changing rules with the filling rate of the orthogonal cross-bonding piles and the X-type piles are not obvious.The geometric control sizes of the two types of periodic piles are more complex and the band gap adjustment ability is more abundant.