亮化工程斜拉索气动特性试验研究  

Experimental Research on Aerodynamic Property of Stay Cables with Lighting Fixtures

作　　者：郑史雄[1] 周强 杨风帆 张宁[1] ZHENG Shi-xiong;ZHOU Qiang;YANG Feng-fan;ZHANG Ning(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Officers College of the PAP,Chengdu 610213,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]中国人民武装警察部队警官学院,四川成都610213

出　　处：《桥梁建设》2021年第6期16-24,共9页Bridge Construction

基　　金：国家自然科学基金项目(U1434205)。

摘　　要：为研究安装类半圆形新型亮化灯具后斜拉索的抗风稳定性,以某斜拉桥斜拉索亮化工程为背景,通过风洞静力三分力和动力试验对其驰振及涡振性能进行分析。风洞试验模型斜拉索直径与原桥保持一致,取具有代表性的75,100,120 mm 3种直径带灯具的斜拉索进行试验。根据静力三分力试验结果和Den Hartog驰振理论,计算得到3种直径带灯具的斜拉索的驰振力系数,最小驰振力系数平均值为-4.2,具备发生驰振现象的必要条件。进一步对不同风攻角及不同风向角进行动力试验,结果表明:当风攻角为90°时,直径100 mm及120 mm带灯具的斜拉索发生小振幅涡振;当风向角为20°及25°时,直径100 mm带灯具的斜拉索发生小振幅驰振,驰振风速分别为30.3 m/s和39 m/s;3种直径带灯具的斜拉索均未发生大振幅驰振及涡振现象。A cable-stayed bridge is used as a case to study the wind-resistant stability of the stay cables after fitted with semicircle lighting fixtures.The galloping and vortex-induced vibrations on the bridge were analyzed via static and dynamic tests in wind tunnel.The diameters of stay cables of the test model were similar to those of the real bridge,and the three representative diameters of 75,100 and 120 mm were selected for the wind tunnel test.Based on the results of the three-component force coefficients and Den Hartog galloping criterion,the galloping coefficients of stay cables of the three diameters that were fitted with lighting fixtures were computed,with a mimimum average galloping force coefficient of-4.2,indicating that the bridge is prone to galloping.Furthermore,dynamic tests were conducted to examine the impact of varying wind attack angles and wind direction angles.When the wind direction angles were at 20°and 25°,small-amplitude galloping was observed on the 100 mm-diameter stay cables with lighting fixtures,and the corresponding critical wind speeds were 30.3 m/s and 39 m/s.No large-ampitude galloping and vortex-induced vibration were observed on the stay cables of the three diameters with lighting fixtures.

关 键 词：斜拉桥 斜拉索 亮化工程 风致振动 静力三分力 风攻角 风向角 风洞试验 

分 类 号：U443.38[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]