道路交通機関による環境振動の実態調査結果とその予測の一方法

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タイトル別名
  • MEASUREMENTS OF VIBRATION LEVELS AT A ROADSIDE AREA AND PREDICTIONS FOR VIBRATION POLLUTION CAUSED BY URBAN TRAFFIC
  • ドウロ コウツウ キカン ニ ヨル カンキョウ シンドウ ノ ジッタイ チョウ

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説明

This paper describes some results of measurements of vibration levels made at roadside area within 40 meters distant from the edge of curb. The measurements were done for two cases, the one was that a vibration level was measured when one vehicle was traveling and another measurement was performed when multiple vehicle were traveling. A factor analysis was applied the data set of 158 measuring points. Using these set of data, a predictor is also established for the vibration level, L_<10>, at a point which is on the roadway just of the rain catch-basin. Using the 7 survey points data which represented the attenuated effect of distance, the vibration levels within 40 meters away from the curb were predicted. Points depicted from these analysis can be summarized as follows : (1) The vibration level at the point which is on the roadway just of the rain catch-basin is affected by the following factors; its magnitude in descending order, the condition of the road suface, the number of lanes, the type of the pavement, and the traffic density. (2) Predicted values are obtained by substituting the scores of the category into the predicting equation (γ=0.84). These are plotted with observed values in Fig.26. (3) Attenuation ranges from one to four dB/D.D.. It is found, however, that attenuation itself is affected by multi-factors such as the number of lanes, the stiffness of ground : N_<10>, and the ground composition. This point is subject to a further stipulation.

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