灯具会改变斜拉索的气动外形，可能诱发驰振现象。为研究不同灯具对斜拉索驰振性能的影响，以某大跨斜拉桥斜拉索为研究背景，开发了一种节段模型低频悬吊系统，开展了节段模型测振风洞试验，研究了0°～180°风攻角条件下安装抱箍式、贴合式和分离式三种灯具斜拉索的驰振性能，并分析了附加阻尼对安装灯具斜拉索驰振临界风速的影响。研究结果表明：灯具类型和斜拉索直径是影响斜拉索驰振性能的重要因素。安装抱箍式灯具斜拉索未发生驰振现象，而安装贴合式灯具斜拉索和分离式灯具斜拉索均在低风速下发生了驰振，说明贴合式灯具和分离式灯具会降低斜拉索的驰振稳定性。安装贴合式灯具时，直径200mm斜拉索的不利风攻角是160°，而直径260mm斜拉索的不利风攻角是30°和150°；安装分离式灯具时，直径200mm斜拉索的不利风攻角是20°，而直径260mm斜拉索未观测到驰振现象。增大阻尼能提高斜拉索的驰振临界风速。相关研究成果可为安装灯具斜拉索的驰振性能及减振控制研究提供重要参考。
Abstract
Lighting fixtures can alter the aerodynamic shape of stay cables and may induce galloping phenomena. In order to study the influence of different lighting fixtures on the galloping performance of stay cables, a segment model low-frequency suspension system was developed based on the stay cable of a long-span cable-stayed bridge. Wind tunnel tests were conducted on segment model vibration measurement, and the galloping performance of three types of lighting fixtures, including hoop type, laminated type, and separated type, were studied under wind attack angles of 0° to 180°. The influence of additional damping on the critical wind speed of galloping for installing lighting fixtures for stay cables was analyzed. The research results indicate that the type of lighting fixture is an important factor affecting the galloping performance of the stay cable. There is no obvious galloping phenomenon when installing the hoop lighting fixture stay cable, but both the installation of the laminated type lighting fixture stay cable and the separate type lighting fixture stay cable have galloping at low wind speeds, indicating that the laminated type lighting fixture and the separate type lighting fixture will reduce the galloping stability of the stay cable. The diameter of the stay cable is an important factor affecting the galloping performance of the stay cable. When installing laminated lighting fixtures, the adverse wind attack angle of the 200mm diameter stay cable is 160°, while the adverse wind attack angles of the 260mm diameter stay cable are 30° and 150°; When installing separated lighting fixtures, the unfavorable wind attack angle of the 200mm diameter stay cable is 20°, while the 260mm diameter stay cable does not show obvious galloping vibration. The critical wind speed of the galloping vibration of the stay cable does not show an proportional relationship with the additional damping. The relevant research results can provide important references for the study of the galloping performance and vibration reduction control of the installation of stay cables for lighting fixtures.
关键词
桥梁工程 /
驰振 /
风洞实验 /
斜拉索 /
灯具
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Key words
bridge engineering /
galloping /
wind tunnel test /
stay cable /
lighting fixture
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