二维框格式表面波屏障设计与减震性能研究

打开文本图片集

关键词：带隙；地震表面波；隔震；传输谱；时域响应分析

中图分类号：TU435 文献标志码：A 文章编号：1000-0844（2025）06—1388—12

DOI：10.20000/j.1000-0844.20240306006

Abstract： Targeting the highly destructive Rayleigh waves，this study designed a 2D frame-type surface wave barrier composed of hollow rectangular columns and solid rectangular columns. Within each hollow square column are four solid rectangular columns partitioning the interior into five fillable regions.First，the dispersion characteristics and transmission properties of the frametype barrier were calculated using the finite element method. Modal analysis of unit cels revealed the bandgap formation mechanism.Parametric studies then quantified the influences of geometric dimensions，materials，and soil properties on bandgap width. For layered soils，the frequencydomain responses of periodic barriers were analyzed， and the vibration attenuation mechanisms were identified via modal diagrams. Finally，the frequency-domain responses of forward/inverse gradient barriers were computed，and the dynamic responses of periodic barriers under artificial/ El-Centro seismic waves were analyzed to validate the seismic wave attenuation characteristics of the barrier. Results indicate the following：（1） The frame-type surface wave barrier exhibits broad bandgaps arising from the Bragg scattering-induced conversion of surface waves into downward-propagating body waves.（2） Soil parameters affect the upper limit of the bandgap，whereas barrier height and column width critically influence attenuation zones.Adjusting these parameters enables targeted Rayleigh wave attenuation across bands.（3） In layered soils，the surface waves are concentrated primarily within the top three layers，and the periodic barrers retain notable attenuation efficacy. （4） The forward/inverse gradient configurations outperform the periodic arrangements.（5） The periodic barriers achieve 70.5% overall acceleration reduction within the bandgaps during seismic events. These findings provide references for novel seismic mitigation structures.

Keywords： bandgap； seismic surface wave; seismic isolation; transmission spectrum； time-domain response analysis

0 引言

地震波可以分为体波和表面波两大类，而面波中的Rayleigh波集中了地震波中的大部分能量，具有传播距离远、衰减慢、频率低（一般在 20Hz 以下）、破坏性强等特点[1]。（剩余14804字）