The elucidation of the long-distance spread mechanism of a low frequency ground vibration to originate in the elevated road

高架路低频地面振动长距离传播机制的阐明

• 批准号: 17560435
• 负责人: HAYAKAWA Kiyoshi
• 金额: $ 2.18万
• 依托单位: Ritsumeikan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560435/
• 关键词: Environmental vibration; Elevated bridge; Low frequency; Long-distance propagation; Isolation wall; 振動対策; 防振壁; 環境振動; 高架道路橋; 低周波; 遠距離伝播; 軟弱地盤; 振動伝播; 現地調査

It spreads in the long distance, and resonance phenomenon is caused in the house, and causes a trouble in soft ground without doing a distance decline because the vibration which makes these elevated bridges a source of occurrence is the vibration of the low frequency in the neighborhood 3-5Hz. A consideration was done from the model experiment and the numerical simulation analysis by this research to clear the long-distance spread character of the ground vibration. It was set at a bridge head 48cm of 1/100 scale of the actual bridge in the model experiment in consideration of similar rule of the model and the real thing. The value which was close to the desired value than the result that exciting experiment was done with model by exciting opportunity could get it, and it could confirm that a phenomenon with the real thing could be almost reproduced. Furthermore, it is analyzed about the vibration factor of the house and so on two dimensional FEM numerical simulation analysis. It found that it was the number of vibration to spread easily in the applicable ground 13.5Hz with the 1^<st> mode by the analysis with the ground model set up in 5.8Hz the 2^<nd> mode. As for the countermeasure method as well which interrupted such a ground vibration in the spread route of the wave motion, it was examined. The isolation wall which a composition wall with concrete and EPS and a scrap tire were used for was devised, and a local experiment and an indoor experiment were done as a material of isolation wall. Through it faced the ground vibration in the low frequency stage being made the target by this research.

由于使这些高架桥成为振源的振动是附近3-5赫兹的低频振动，所以它在远距离传播时会在房屋内引起共振现象，在软弱地基上不做距离衰减就会引起故障。通过模型试验和数值模拟分析，明确了地面振动的远距离传播特征。在模型试验中，考虑到模型与实桥的相似规律，将其设置在实桥1/100比例尺的桥头48 cm处。与用模型通过激发机会进行激发实验的结果相比，接近期望值的值可以得到它，并且可以证实与真实事物几乎可以重现的现象。并对房屋的振动因素进行了二维有限元数值模拟分析。通过对5.8赫兹的地面模型进行分析，发现在适用的13.5赫兹的地面上，容易传播的振动个数为1^lt；st；st；对于在波动传播路径中阻断这种地面振动的对策方法也进行了研究。设计了混凝土与EPS复合墙体和废旧轮胎作为隔震墙材料的隔震墙，并进行了现场试验和室内试验。通过它面对地面在低频阶段的振动，成为本研究的目标。

项目成果

EPS合成遮断壁による地盤振動遮断効果とその評価法の提案

EPS合成隔震墙地面隔振效果及其评价方法的提出

• 发表时间: 2007
• 期刊: 土木学会論文集
• 作者: 大下寛司;澤井健二;波多野雄士;井上晋;澤井 健二;早川 清
• 通讯作者: 早川 清

A model experiment about the ground vibration which occurs from the overhead road bridge

公路桥梁地面振动模型试验

• 发表时间: 2007
• 期刊: The 42^<nd> annual meeting of the Japanese Geotechnical Society
• 作者: K.Hayakawa;I.Nakaya;K.Tanaka
• 通讯作者: K.Tanaka

The vibration spread character of the model high bridge

模型高桥振动传播特性

• 发表时间: 2007
• 期刊: 19^<th> year of Heisei annual meeting of Kansai branch of Japanese Civil Engineering
• 作者: K.Hayakawa;I.Nakaya;K.Tanaka
• 通讯作者: K.Tanaka

Fundamental model test on the ground vibration isolation barrier for the traffic vibration

交通振动地面隔振屏障基础模型试验

• 发表时间: 2006
• 期刊: INTER-NOISE 2006 (CD-ROM)
• 作者: Yasuyuki Nabeshima;Kiyoshi Hayakawa
• 通讯作者: Kiyoshi Hayakawa

Measures Against Road Traffic Originated Ground Vibration and Assessment of Their Performances

道路交通地面振动防治措施及其性能评价

• 发表时间: 2005
• 期刊: GESTS International Transaction on Acoustic Science and Engineering Vol.3, No.1
• 作者: Kiyoshi Hayakawa;Hirokazu Kadota;Yoshitaka Ashikari
• 通讯作者: Yoshitaka Ashikari