Comparison of field measured data of low-frequency noise radiated from steel bridges with analytical ones and its reduction countermeasure

钢桥辐射低频噪声实测数据与分析数据对比及降低对策

• 批准号: 13650519
• 负责人: SUGIYAMA Toshiyuki
• 金额: $ 2.11万
• 依托单位: University of Yamanashi
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650519/
• 关键词: steel highway bridge; low-frequency sound; sponson deck type bridge; sponson beam type bridge; bridge vibration; 低周波雑音; 張出し桁工法

As the numerically calculated values of sound pressure level radiated from 3-span continuous steel girder bridge which locates on Chugoku Express Highway agree well with the field measured data, the appropriateness of analytical method developed by the head investigator's research group has been proved.By Use of the analytical method developed here, the effectiveness of several types of reduction countermeasure against low-frequency sound radiated from 3-span continuous steel girder bridge has been investigated. The following results have been obtained. That is,(1) The method in which end sway bracing is covered by concrete is not so effective to reduce the low-frequency sound pressure level.(2) The effectiveness of both sponson beam type bridge and sponson deck type bridge depends on the span length of bridge and the traveling velocity of vehicle passing over bridge.(3) The effectiveness of both sponson beam type bridge and sponson deck type bridge also depends on the supporting condition with respect to sponson part.(4) The method that central point of each span is supported with fix shoe and/or pin shoe is considerably effective although its cost becomes higher.(5) Low-frequency sound pressure level radiated from bridges is sensitive to the condition whether vehicle passing over bridge vibrates or not when it enters into the bridge. This fact means that careful attention should be paid to the numerical analysis.A numerical analysis about the effect of spring constant of vehicle passing over bridge on the low-frequency sound pressure level radiated from highway bridge will be carried out in the near future.

由于中国高速公路三跨连续钢梁桥辐射声压级的数值计算值与现场实测数据吻合较好，证明了课题组组长研究组开发的分析方法的适当性。利用本文开发的分析方法，对三跨连续钢梁桥辐射低频声的几种抑制措施的有效性进行了研究。已获得以下结果。也就是说，（1）端部防摇支撑采用混凝土覆盖的方法对于降低低频声压级效果不太明显。（2）舷侧梁式桥梁和舷侧甲板式桥梁的有效性都取决于桥梁的跨长和车辆通过桥梁的行驶速度。（3）舷侧梁式桥梁和舷侧甲板式桥梁的有效性还取决于舷侧的支撑条件。 (4)每跨中心点采用固定瓦和/或销瓦支撑的方法，虽然成本较高，但效果相当好。(5)桥梁辐射的低频声压级对过桥车辆进入桥梁时是否振动的情况敏感。这一事实意味着数值分析应引起重视。近期将开展车辆过桥弹簧常数对公路桥梁辐射低频声压级影响的数值分析。