公铁平层桥梁桥塔遮风效应风洞试验研究

何佳骏; 向活跃; 朱金; 张博韬; 李永乐

doi:10.3969/j.issn.0258-2724.20210286

公铁平层桥梁桥塔遮风效应风洞试验研究

doi: 10.3969/j.issn.0258-2724.20210286

何佳骏^1,,
向活跃^{1, 2, ,},
朱金^{1, 2},
张博韬¹,
李永乐^{1, 2}

1.
西南交通大学土木工程学院，四川成都 610031
2.
西南交通大学风工程四川省重点实验室，四川成都 610031

基金项目: 国家自然科学基金（51778544，51978589，52008396）

详细信息

作者简介:
何佳骏（1994—），男，博士研究生，研究方向为车桥耦合振动效应，E-mail：1016396401@qq.com

通讯作者:
向活跃（1986—），男，副教授，博导，研究方向为车桥耦合振动效应，E-mail： hy@swjtu.edu.cn

中图分类号: U447
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- 被引次数: 0
出版历程
- 收稿日期: 2021-04-16
- 修回日期: 2021-07-12
- 网络出版日期: 2022-11-09
- 刊出日期: 2021-07-19

Experimental Study on Shelter Effect of Bridge Tower on Single-Level Rail-Cum-Road Bridge

HE Jiajun^1
,,
XIANG Huoyue^{1, 2
, ,},
ZHU Jin^{1, 2},
ZHANG Botao¹,
LI Yongle^{1, 2}

1.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.
Wind Engineering Key Laboratory of Sichuan Province, Southwest Jiaotong University, Chengdu 610031, China

摘要

摘要:
车辆经过桥塔区域时，由于桥塔的遮风效应，其气动荷载会产生突变，且公铁平层桥梁的桥塔由于纵向尺度较大，车辆经过桥塔区域时气动荷载的变化更加剧烈. 为明确某公铁平层桥梁上车辆在桥塔区域的气动特性，制作了1/20大比例尺的风洞试验模型；基于优化后的测试系统，测试了车辆通过公铁平层宽幅桥梁桥塔时的气动荷载，研究了车道位置、车辆类型以及桥塔外形对通过桥塔车辆的气动特性的影响. 结果表明：越靠近桥塔车道上的车辆，经过桥塔时的横向力系数、摇头力矩系数的突变量更大，正向升力也越大，因而更容易发生侧滑与侧偏；车长对车辆通过桥塔区域的性能有显著影响，长度较小的车辆具有更大的横向力系数突变量，长度较长的车辆具有更大的倾覆力矩系数、摇头力矩系数及点头力矩系数突变量；与矩形截面桥塔相比，带倒角的桥塔使得厢式货车的横向力突变量减小了43.7%，使集装箱车的横向力系数突变量减小了25.8%，且使集装箱车的摇头力矩系数突变量减小了29.2%.
- 公铁平层桥梁 /
- 宽幅桥面 /
- 桥塔 /
- 风洞试验 /
- 汽车 /
- 气动性能
Abstract:
The shelter effect of the bridge tower brings a sudden change of aerodynamic load on road vehicles passing by. For a single-level rail-cum-road bridge with larger scale of bridge tower in the longitudinal direction, the variation of the aerodynamic load is more intense. To explore the aerodynamic characteristics of vehicles near the pylon area on a single-level rail-cum-road bridge, a 1/20 scale wind tunnel test model is built. Based on the optimized test system, the aerodynamic loads of road vehicles passing by the bridge tower are measured. The influence of lane location, the vehicle type, and the bridge tower type on the aerodynamic load is discussed. The results reveal that traveling on a closer lane to the tower increases the variation amplitude in side force coefficient and yawing moment coefficient, and the upward lift force is also larger; thus vehicles are prone to sideslip and lateral-deviation. The vehicle length has a significant impact on the aerodynamic characteristics of the vehicles passing by the bridge tower area. Vehicles with smaller length possess larger variations of side force coefficient, while vehicles with larger length possesses larger variations of rolling moment coefficient, yawing moment coefficient and pitching moment coefficient. Compared with the bridge tower with a rectangular section, the bridge tower with chamfer decreases the sudden variation of side force coefficient of a van by 43.7%, and decreases the sudden variation of side force coefficient and yawing moment coefficient of a track-trailer by 25.8% and 29.2%, respectively.
- single-level rail-cum-road bridge /
- wide deck /
- pylon /
- wind tunnel test /
- road vehicle /
- aerodynamic performance

HTML全文

图 1 宜宾临港桥主梁截面

Figure 1. Main beam section of the Yibin Lingang Yangtze River Bridge

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图 2 节段模型桥面系

Figure 2. Deck system of the section model

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图 3 桥塔截面

Figure 3. Section of the bridge tower

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图 4 汽车模型尺寸

Figure 4. Dimensions of road vehicle model

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图 5 试验中的模型

Figure 5. Test model in the experiment

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图 6 工况布置

Figure 6. Test arragement

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图 7 汽车五分力示意

Figure 7. Five-component force of the vehicle

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图 8 厢式货车过矩形截面桥塔时的气动力系数

Figure 8. Aerodynamic force coefficients of the van when passing the bridge tower with rectangular section

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图 9 车辆类型对气动力系数的影响

Figure 9. Influence of the vehicle type on aerodynamic force coefficients

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图 10 桥塔类型对横向力系数的影响

Figure 10. Influence of tower type on transverse force coefficient

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图 11 桥塔类型对升力系数的影响

Figure 11. Influence of tower type on lift force coefficient of the van

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图 12 桥塔类型对摇头力矩系数的影响

Figure 12. Influence of tower section type on yawing moment coefficient

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图 13 桥塔类型对点头力矩系数的影响

Figure 13. Influence of tower type on pitching moment coefficient of the van

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表 1 天平参数

Table 1. Parameters of the force mearing balance

参数名称取值

力量程/N ±50
力矩量程/（N·m） ±2
力精度/% 0.5
力矩精度/% 0.5
最大采样频率/kHz 1

下载: 导出CSV

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