Effects of Downburst on Long-span Continuous Rigid Frame Bridges

被引：0
|
作者：
Xin Y.-B. [1 ,2 ]
Liu Z.-W. [1 ]
Shao X.-D. [1 ]
Chen Y.-R. [1 ]
Chen Z.-Q. [1 ]
机构：
[1] Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan University, Changsha, 410082, Hunan
[2] Xiandai Investment Company Limited, Changsha, 410004, Hunan
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2019年 / 32卷 / 10期
关键词：
Bridge engineering; Downburst; Wind field simulation; Wind tunnel test; Wind-induced vibration response;
D O I：
10.19721/j.cnki.1001-7372.2019.10.027
中图分类号：
学科分类号：
摘要：
To study the wind-induced response of a long-span continuous rigid frame bridge under downburst horizontal wind, a set of experimental devices for simulating high-speed downburst horizontal wind in an atmospheric boundary layer wind tunnel was developed. The horizontal wind velocity profiles of downburst were simulated by adjusting the vertical position and inclination of the sloping plate placed in the wind tunnel. The time characteristics of downburst were simulated by controlling the rotating velocities and angles of the horizontal opening and closing plates on both sides. Considering the auxiliary-channel Humen Bridge in Guangdong as an example of a long-span rigid continuous rigid frame bridge, a 1:200 geometric scale aero-elastic model of the bridge with maximum double cantilevers was developed. Three wind tunnel experiments on the continuous rigid frame bridge model with maximum double cantilevers were conducted under a downburst transient wind field, downburst steady wind field, and B-type atmospheric boundary layer (ABL) wind field, respectively. The displacements of the bridge model under different wind fields were analyzed and compared. The results show that the horizontal wind velocity profile of the downburst simulated in the ABL wind tunnel by the downburst simulation device agrees well with the empirical wind profiles of downburst. The downburst simulation device can be used to simulate the time characteristics of downburst wind speed. The turbulence intensities of the simulated downburst transient wind field generally approximate the target values. The maximum time-varying root mean square (RMS) values of the transverse displacement of the bridge deck tip under a transient wind field of downburst and under a steady wind field of downburst are 2.7-6.8 and 0.7-2.3 times that of the bridge deck tip under the B-type ABL wind field, respectively. In addition, the maximum time-varying RMS values of the vertical displacement of the bridge deck tip under a transient wind field of downburst and under a steady wind field of downburst are approximately 2.3-5.3 and 0.9-2.6 times that of the bridge deck tip under the B-type ABL wind field, respectively. © 2019, Editorial Department of China Journal of Highway and Transport. All right reserved.
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页码：279 / 290
页数：11
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