Wind Tunnel Test on Aerodynamic Characteristics of Vehicles in Double-deck Highway-railway Steel Truss Bridge Under Crosswind Conditions

被引：0

作者：

He, Xu-Hui ^{[1
]}

Ma, Qing ^{[1
]}

Zou, Yun-Feng ^{[1
]}

Gao, Su-Ping ^{[1
]}

Liang, Hao-Bo ^{[1
]}

Guo, Dian-Yi ^{[1
]}

机构：

[1] School of Civil Engineering, Central South University, Hunan, Changsha

来源：

Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2024年 / 37卷 / 08期

基金：

中国国家自然科学基金;

关键词：

aerodynamic characteristics; bridge engineering; car-bridge system; double-deck bus; road-rail truss bridge; wind tunnel test;

D O I：

10.19721/j.cnki.1001-7372.2024.08.003

中图分类号：

学科分类号：

摘要：

To evaluate the safety of the double-deck highway-railway steel truss bridges in strong winds, wind-tunnel tests were used to obtain accurately the mutual aerodynamic characteristics of a double-deck highway-railway truss bridge and vehicle under crosswind conditions. Using the highway-railway double-deck truss and the double-deck bus as the research objects, a rigid pressure model of the bridge and vehicle with a geometric scale ratio of 1: 50 was designed and implemented. The wind pressure distribution on the surface of the vehicle under the vehicle-bridge combination condition was tested based on the wind-tunnel test, and the influence of the lateral distance of the lane on the bridge deck of the double-deck truss bridge on the aerodynamic characteristics of the vehicle was analyzed. Furthermore, the wind pressure coefficient distribution on the vehicular surface was analyzed to explore the mechanism responsible for the changes in the vehicle's aerodynamic coefficient. The results show that the change of lateral lane distance in the double-layer truss bridge has a considerable influence on the side and the lift force coefficients followed by the yawing and the rolling moment coefficients. However, the influences on the drag force coefficients and the pitching moment coefficients of the vehicle arc small and have a finite discreteness. Owing to the wind-tunnel effect, the side force coefficients of the double-deck bus in the double-deck truss bridge are always greater than those of a stationary bus on the bridge deck. Because the deflection moment is the result of the yawing moment coefficients, its change rule is the same as that of the side force coefficients. The side force coefficient is mainly determined by the size of the windward side. Moreover, The lift coefficient (CD of a double-deck passenger car when situated on a truss bridge is greater than its lift coefficient when inside the truss bridge. © 2024 Chang'an University. All rights reserved.

引用

页码：32 / 42

页数：10