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

它在远距离传播，并且在房屋内引起共振现象，并且在软土地上造成麻烦而不做距离下降，因为使这些高架桥梁发生的振动源是附近3-5Hz的低频振动。本研究从模型试验和数值模拟分析两方面考虑，明确了地面振动的远距离传播特性。在模型实验中，考虑到模型与实物相似的规律，将其设置在实际桥梁1/100比例的桥头48cm处。与利用激励机会用模型进行激励实验得到的结果更接近期望值的数值，可以证实一种现象几乎可以用实物再现。此外，还对房屋的振动因素进行了二维有限元数值模拟分析等。通过对建立在5.8Hz的2^<和>模式下的地面模型进行分析，发现在1^<和>模式下，在适用的13.5Hz的地面上，最容易传播的是振动数。对在地震波传播路径上中断这种地面振动的对策方法进行了探讨。设计了以混凝土、EPS和废轮胎复合墙体作为隔震墙材料的隔震墙，并进行了局部试验和室内试验。通过对其在低频阶段所面临的地面振动进行研究，使其成为目标。

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.