周期性堆载体Rayleigh波减振特性分析及试验研究  

Analysis and experimental study on vibration attenuation characteristics of periodic reactor barriers for Rayleigh waves

作　　者：易利琴 陈晓斌[1,2] 王业顺 虞洪 金伟涛 YI Liqin;CHEN Xiaobin;WANG Yeshun;YU Hong;JIN Weitao(School of Civil Engineering,Central South University,Changsha 410075,China;Key MOE Laboratory of Heavy Haul Railway Engineering,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]重载铁路工程结构教育部重点实验室,湖南长沙410075

出　　处：《铁道科学与工程学报》2024年第4期1457-1469,共13页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51978674)。

摘　　要：为了揭示周期性堆载体Rayleigh波的振动作用波特性,实现对低频表面波的有效衰减,研究了衰减域内的减振机理及效果。首先,构建传输模型,确定了合适的堆载几何尺寸。其次,基于复频散曲线和频域曲线,分析了堆载高度和弹性模量影响下振动波的作用规律及其衰减效果。最后,开展缩尺扫频试验,调取X、Z方向的加速度数据绘制频域曲线,并与复频散曲线做进一步对比分析,研究了各衰减域减振机理。结果表明:扫频试验结果出现了X、Z方向衰减域不一致的现象,不同方向的衰减域恰好与复频散曲线中的衰减域内作用波型一致,X方向会出现一个低频段衰减域,Z方向会在第2衰减域终止频率时出现衰减减弱趋势;进一步说明周期性堆载体可以激发出水平极化共振衰减域和Bragg散射衰减域;而高度是影响伪表面波的重要因素,表现为高度高,容易在第1衰减域内产生伪表面波,高度低,容易在第2衰减域内产生伪表面波;弹性模量是影响高速伪表面波的重要因素,表现为当其达到混凝土弹性模量单位数量级(10 GPa)时,第3衰减域可能会出现高速伪表面波作用范围,否则,将直接进入SV波和P波耦合作用的凋落波模态。研究结果将进一步启发环境隔振领域利用表面波阻块开展减振工作。The vibration attenuation mechanism and effect within the attenuation zone were studied to reveal the vibration characteristics of Rayleigh waves in periodic reactor barriers and realize the effective attenuation of low-frequency surface waves.First,a transmission model was established to determine the appropriate geometry dimensions of the reactor barriers.Next,the action rule and attenuation effect of the vibration wave under the influence of height and elastic modulus were analyzed based on the complex dispersion and frequency domain curves.Finally,the scaling frequency sweep test was carried out to obtain the acceleration data in the X and Z directions.This data was further compared with the complex frequency dispersion curves to study the vibration attenuation mechanism of each attenuation zone.It is shown that the attenuation zones in the X and Z directions are inconsistent,and the attenuation zones in different directions are the same as the action wave mode in the attenuation zone for the complex dispersion curve.Besides,a low-frequency attenuation zone will appear in the X direction,and the attenuation trend will appear in the Z direction when the second attenuation zone terminates.It is further demonstrated that the period reactor barriers can excite the horizontal polarization resonance attenuation zone and the Bragg scattering attenuation zone.Height is an essential factor affecting the pseudo-surface waves.When the height is high,generating pseudo-surface waves is accessible in the first attenuation zone.When the height is low,generating pseudo-surface waves in the second attenuation zone is easy.The elastic modulus is an essential factor affecting high-speed pseudo-surface waves.When it reaches the unit magnitude of the concrete elastic modulus(10 GPa),the action range of the high-speed pseudo-surface wave may appear in the third attenuation zone.Otherwise,it will directly enter the SV wave and P-wave coupling mode.The research results will further enlighten the field of environmental vibration isol

关 键 词：周期性堆载体 RAYLEIGH波 试验 特性分析 环境减振 

分 类 号：TU435[建筑科学—岩土工程]