桥面不平度对主梁气动力及涡振性能的影响

发布时间：2018-10-08 17:45

【摘要】：为研究不同桥面状况下大跨度悬索桥气动力稳定性及涡振范围和极值的变化规律,以寸滩长江大桥为背景进行分析。选取3种桥面不平度,通过MATLAB编程模拟得到各桥面不平度的变化范围,在此基础上根据节段模型缩尺比选取相应的砂纸模拟3种桥面不平度,在风洞开展主梁节段模型静力三分力系数和涡振试验。利用CFD软件从微观上分析主梁周围的流线轮廓、压强及速度随桥面不平度的变化特征。结果表明:随桥面不平度的增加,在正攻角范围内,阻力系数CD减小,升力系数CL增大;桥面不平度对力矩系数CM基本没有影响。随着桥面不平度的增加,主梁的竖向涡振振幅、扭转涡振角度及扭转涡振区间减小,扭转涡振响应变化幅度大于竖向涡振响应。
[Abstract]:In order to study the aerodynamic stability, the range and extreme value of vortex vibration of long-span suspension bridge under different deck conditions, the background of the bridge is analyzed. Three kinds of bridge deck irregularity are selected, and the variation range of each deck irregularity is obtained by MATLAB programming. Based on this, sand paper is selected to simulate three kinds of bridge deck irregularity according to the scale ratio of segmental model. The static three-point force coefficient and vortex vibration test of the main beam segment model are carried out in the wind tunnel. The variation characteristics of streamline profile, pressure and velocity around the main beam with the bridge deck irregularity are analyzed microscopically by CFD software. The results show that in the range of positive angle of attack, the drag coefficient CD decreases and lift coefficient CL increases with the increase of deck roughness, and the bridge deck roughness has no effect on the moment coefficient CM. With the increase of bridge deck irregularity, the amplitude of vertical vortex vibration, torsional vortex vibration angle and torsional vortex vibration interval decrease, and the variation of torsional vortex vibration response is larger than that of vertical vortex vibration response.
【作者单位】：重庆大学土木工程学院;甘肃省交通规划勘察设计院;
【基金】：国家自然科学基金项目(51578098) 重庆市建委科技项目(20130844)~~
【分类号】：U441

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