摘要
本文针对轨道交通运营时带来的持续性振动对周边居民身体健康和敏感构建物结构安全的影响进行探讨。基于周期理论,提出一种石球阵列隔振结构来减轻轨道交通运营引起的环境振动危害。通过求解频散曲线图,研究石球阵列参数对带隙的影响,并剖析了隔振机理;其次,通过求解传输透射谱,研究了有限数量石球阵列隔振性质。研究发现,石球排距和尺寸大小对表面波能带影响较大,针对低频表面波隔振,石球排距建议取1.0~1.2 m,石球尺寸建议大于0.4 m;石球的排布方式对高频能带影响较大,对低频能带影响较小;相比正方形排布方式,三角形排布方式可以降低振动波泄漏,隔振效果更好。传输谱透射分析发现,石球阵列低频隔振时隔振机理为局域共振机理,高频隔振时机理为Bragg散射机理;组合石球隔振方式可以拓宽衰减域,隔振效果更好。相关研究可为轨道交通隔振提供参考。
This study investigates the effects of sustained vibrations caused by rail transportation operations on the physical health of nearby residents and the structural safety of sensitive buildings.Based on the theory of periodicity,a stone ball array isolation structure is proposed to mitigate the environmental vibration hazards caused by rail transportation operations.By solving the dispersion curve,the study explores the influence of stone ball array parameters on band gaps and analyzes the isolation mechanism.Furthermore,by solving the transmission spectrum,the study examines the isolation properties of a finite number of stone ball arrays.The research findings indicate that the spacing and size of the stone ball arrangement have a significant impact on the surface wave band.For low-frequency surface wave isolation,a recommended stone ball spacing is between 1.0-1.2 meters,and the stone ball size should be greater than 0.4 meters.The arrangement of the stone balls has a greater effect on the high-frequency band and a smaller effect on the low-frequency band.Compared to a square arrangement,a triangular arrangement can reduce vibration wave leakage and achieve better isolation effects.Transmission spectrum analysis reveals that the mechanism for low-frequency isolation in the stone ball array is local resonance,while the mechanism for high-frequency isolation is Bragg scattering.Combining different stone ball isolation methods can broaden the attenuation range and achieve better isolation effects.This research provides valuable insights into rail transportation isolation strategies.
作者
姜荣斌
蒋凤昌
周桂香
Jiang Rongbin;Jiang Fengchang;Zhou Guixiang(Taizhou Polytechnical College,Taizhou 225300,Jiangsu,China;Complex Engineering Management Research Institute,Tongji University,Shanghai 200129,China)
出处
《科技通报》
2024年第5期13-18,95,共7页
Bulletin of Science and Technology
基金
江苏省高等职业教育高水平专业群建设项目(2020-80)
江苏省发改委省级工程研究中心建设项目(JPERC2021-168)
江苏高校“青蓝工程”(苏教师函〔2023〕27号)。
关键词
周期结构
石球
表面波
轨道交通
隔振
periodic structure
globular stone
surface wave
rail transportation
vibration isolation
