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地铁致振作用下局域共振混凝土结构的动力响应

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地铁运行穿过建筑物时会造成振动干扰,本研究基于地铁减振问题,提出了一种新型的周期性局域共振混凝土板(PLRCs),并结合试验测试与仿真计算对其带隙特性、减振机理进行了分析和验证.开展了列车致振PLRCs振动衰减性能研究并探究了结构几何参数及材料参数对弯曲波带隙的影响.研究表明,PLRCs可打开频率范围为54.3~121.8 Hz的弯曲波带隙,抑制其动力学响应.模态之间的耦合作用导致产生弯曲波带隙,这种耦合效应将弯曲波局限于谐振腔内,阻止其在平板内的传播,进而抑制了振动.合理改变PLRCs结构尺寸参数和材料参数可以优化带隙范围,随着柔性包覆层的厚度、宽度及弹性模量的增加,衰减域范围逐渐降低.缩尺试验和模拟试验都表明PLRCs结构比混凝土板具有更好的减振效果.因此,PLRCs结构可为当前建筑结构的减振问题提供新的思路和方法.
Dynamic Response of Local Resonant Concrete Structures Under Excitation by Subway
The subway line will cause vibration interference when passing through buildings.In this paper,based on the problem of subway vibration reduction,a new type of periodic local resonance concrete slab(PLRCs)was proposed,and its band-gap characteristics and vibration reduction mechanism were analyzed and verified by combining test and simulation.The vibration attenuation performance of PLRCs induced by train vibration was studied,and the effects of structural geometry and material parameters on the band gap of bending wave were investigated.The results show that PLRCs can open the band gap of bending wave in the frequency range of 54.3~121.8 Hz and suppress its dynamic response.The coupling between the modes leads to the flexural band gap,which restricts the flexural wave to the cavity and prevents its propagation in the plate,thus suppressing the vibration.The band gap range can be optimized by changing the PLRCs structure size parameters and material parameters reasonably.The attenuation range decreases gradually with the increase of the thickness,width and elastic modulus of the flexible coating.Both scale test and simulation test show that PLRCs structure has better damping effect than concrete slab.Therefore,PLRCs structure can provide new ideas and methods for vibration reduction of current building structures.

rail transitstructural vibration reductiondynamic responselocal resonanceperiodic structure

卓国威、马钢、高松涛、李波、张凯

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太原理工大学 土木工程学院,山西 太原 030024

轨道交通 结构减振 动力学响应 局域共振 周期性结构

2024

中北大学学报(自然科学版)
中北大学

中北大学学报(自然科学版)

影响因子:0.258
ISSN:1673-3193
年,卷(期):2024.45(6)