蜂窝型周期屏障结构地震波衰减性能研究

针对特定范围内的低频 Rayleigh 表面波,文章设计一种半埋入式蜂窝型地震超屏障结构,阻隔 Rayleigh 波的传播以减少其对建筑物的震害损伤。首先基于 Bloch-Floquet 理论求解得到蜂窝型地震超屏障细胞的频散关系和带隙特性,然后通过参数化分析埋深、柱高和土壤等对单胞带隙的影响,最后选取正弦波和地震波对蜂窝型超屏障进行时程分析,探究超屏障对不同主频率地震波的阻隔效果,验证超屏障对 $ 7.07 \sim 13.02 \, Hz $ 范围内地震波的衰减作用。结果表明,蜂窝型地震超屏障对主频在衰减域范围内的地震波具有较好阻隔作用,在建筑结构隔震减振中具有良好的应用前景。

For the low-frequency Rayleigh surface wave in a specific range, a honeycomb semi-buried seismic super-barrier structure was designed to block the propagation of Rayleigh wave and reduce its seismic damage to buildings. Firstly, based on the Bloch-Floquet theory, the dispersion relation and band gap characteristics of honeycomb seismic super-barrier cells were obtained. Secondly, the influence of buried depth, column height and soil on the cell band gap was analyzed parametrically. Finally, sine wave and seismic wave were selected to analyze the time history of the honeycomb super-barrier, and the blocking effect of the super-barrier on seismic waves of different main frequencies was studied, and the attenuation effect of the super-barrier on seismic waves in the range of 7.07-13.02 Hz was verified. The results show that the honeycomb seismic super-barrier has a good blocking effect on the seismic waves with the main frequency in the attenuation domain, and has a good application prospect in the seismic isolation and vibration reduction of building structures.