风屏障对简支箱梁桥上风场分布影响的试验研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (5) : 287-295.

论文

邱晓为1，李小珍1，谭懿玲1，李星星1，肖军1,2,3

作者信息 +

Tests for effects of wind barrier on wind field distribution above track on a simply supported box girder bridge

QIU Xiaowei1, LI Xiaozhen1, TAN Yiling1, LI Xingxing1, XIAO Jun1,2,3

Author information +

文章历史 +

摘要

为探究横风作用下风屏障对简支箱梁桥上轨道上方风场特征分布的影响机理，以高速铁路典型跨度32m预应力混凝土简支箱梁为背景，通过几何缩尺比为1:30的节段模型风洞试验，采用三维脉动风速仪测试了铁路桥面轨道中心上方的风场信息，并考虑了来流风环境、轨道位置、透风率等试验因素。研究结果表明：基于最小二乘法理论对试验数据进行过原点的线性拟合分析可以更好地反映测点风速与来流风速之间关系；与裸梁桥面风场的湍流强度相比，均匀来流风速对风屏障屏蔽作用下的桥面风场湍流强度影响较大，其风速比非一致性指标与其湍流强度的变异性相关；均匀风场中桥面轨道中心部分位置的风速增加可达32.8%，而湍流风场会弱化裸梁桥面等效风场的放大效应；风屏障可以有效地降低桥面风场的平均风速，透风率30%的风屏障屏蔽作用下其迎、背风侧等效风速分别为裸梁状态下的21.6%和19.4%。

Abstract

To investigate the influence mechanism of wind barrier on wind field characteristics distribution above the track of typical simply supported box girder under the cross wind action, the wind tunnel test of a section model with a 1:30 geometric scale was carried out on a 32m (typical span of high-speed railway ) prestressed concrete simply supported box girder, The wind field information above the track center of railway bridge deck was measured by three-dimensional fluctuating anemometer, and the test factors such as incoming wind environment, track position and porosities were considered. The result shows that: based on the theory of least squares method, the linear fitting analysis of the test data with zero intercept can better reflect the wind speed relationship between the measuring point and the far field. Compared with the bare beam bridge, the uniform incoming wind speed has a greater influence on the turbulence intensity of the bridge deck wind field with the wind barrier, and the inconsistency index of wind speed ratio is related to the variability of turbulence intensity. The wind speed at the special position of the bridge track center in the uniform wind field increased by 32.8%, however the turbulent wind field will weaken the amplification effect of the equivalent wind field on the bare bridge deck. The wind barrier successfully decreases the mean velocity above the girder, under the shielding effect of a wind barrier with a porosity of 30%, the equivalent wind speeds on the windward and leeward sides are 21.6% and 19.4% of those in the bare beam state, respectively.

导出引用

邱晓为1，李小珍1，谭懿玲1，李星星1，肖军1,2,3. 风屏障对简支箱梁桥上风场分布影响的试验研究[J]. 振动与冲击, 2022, 41(5): 287-295

QIU Xiaowei1, LI Xiaozhen1, TAN Yiling1, LI Xingxing1, XIAO Jun1,2,3. Tests for effects of wind barrier on wind field distribution above track on a simply supported box girder bridge[J]. Journal of Vibration and Shock, 2022, 41(5): 287-295

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