Development of model for comprehensive environmental assessment of bridge vibration induced by traveling vehicles.

车辆在公路桥上行驶会引起桥梁振动。桥梁振动通过桥基在地面传播，通过桥梁上部结构在空中传播。这些地-骨振动和气骨振动有时似乎会影响人们的生命和健康。地面振动作为环境评价中的具体项目之一，有其预测方法和评价方法，并对各种对策进行了研究。而次声，即定义为1-80赫兹分量的气骨振动，目前在我国的评估中并未列入具体项目，而是列入了重要项目。1)桥梁振动特性研究利用桥梁振动数据，…进行时间序列分析和快速傅立叶变换分析为了研究桥梁的振动特性，对桥梁进行了更多的地面振动、次声和噪声测量，即桥梁构件在伸缩缝附近行驶时的动力响应以及结构条件对次声空间分布的影响。2)次声的产生和传播机理阐明了结构条件对车辆通过凸起引起的桥梁振动的影响以及桥梁振动在频域中传递到次声的放大特性。3)桥梁振动次声的评估模型由于次声是由车辆行驶引起的桥梁振动引起的，因此次声评估需要阐明桥梁振动的产生模型。因此，为了利用次声进行评估，本研究建立了精确的桥梁振动仿真模型。利用该仿真模型进行了数值分析，研究了桥梁结构条件和车辆动力特性对次声的影响。较少

Traveling of vehicles on highway bridges causes bridge vibration. The bridge vibration propagates in the ground through bridge foundation and in the air through bridge superstructure. These ground-bone vibration and air-bone vibration seem to affect sometimes people's life and health. Ground vibration, one of the specific items in the environmental assessment, has prediction method and evaluation method and various kinds of countermeasures have been studied. On the contrary, infrasound that is defined air-bone vibration with 1-80Hz components is not included in the specific items but included in the important items in the assessment in our country at present. Then prediction method and evaluation method of infrasound have not been established.This study aims to develop a comprehensive model for assessment of bridge vibration caused by traveling of vehicles.1) Study of characteristics of bridge vibrationTime-series analysis and FFT analysis were conducted using data of bridge vibration, … More ground vibration, infrasound and noise measured at the highway bridges in order to study bridge vibration characteristics, namely the dynamic response of bridge members caused by traveling of vehicles near expansion joint and effects of structural conditions on the spatial distribution of infrasound.2) Mechanism of generation and propagation of infrasoundInfluence of structural conditions was clarified on the bridge vibration induced by traveling of vehicles over bump and amplification characteristics of transfer of bridge vibration into infrasound in frequency domain.3) A model of assessment of infrasound induced by bridge vibrationIt is required for the assessment of infrasound to clarify the generation model of bridge vibration because infrasound is induced by bridge vibration caused by traveling of vehicles. Therefore, precise simulation model of bridge vibration is developed in this study in order to utilize assessment of infrasound. Numerical analysis using this simulation model was conducted to study the effects of structural conditions of bridges and dynamic properties of vehicles on infrasoand. Less