摘要
为研究附属设施对三箱梁涡激振动(vortex-induced vibration,VIV)的影响,以某公铁两用分离式三箱梁桥为背景,在XNJD-1回流串联风洞中进行了风洞试验。试验设置了多组工况,分别用于研究检修车轨道、单个梁上附属设施以及附属设施组合对三箱梁VIV的影响。对试验结果进行分析后发现,检修车轨道对三箱梁VIV特性的影响有限,公路风屏障会同时恶化竖向和扭转VIV,而铁路风屏障能够抑制VIV的发生,防撞护栏能够抑制竖向VIV但会激起扭转VIV。与防撞护栏相比,铁路风屏障在竖向VIV的抑制方面表现更为出色,而公路风屏障对竖向VIV的恶化作用要大于铁路风屏障和防撞护栏的抑制作用。公路风屏障是扭转VIV的主要激励源,带有公路风屏障的工况都产生严重的扭转VIV。通过计算流体动力学数值模拟,对三箱梁的流场特征进行了分析,结果发现附属设施促进了主梁间隙中漩涡的生成与发展,从而加剧了三箱梁的涡激振动。
Here,to study effects of attachments on vortex induced vibration(VIV)of a triple-box girder bridge,taking a certain highway and rail way dual-use separated triple-box girder bridge as background,wind tunnel tests were conducted in XNJD-1 reflux series wind tunnel.Multiple sets of operating conditions were set up in tests to study effects of rail maintenance,single beam attachments and combinations of attachments on VIVs of triple-box girder.After analyzing the test results,it was shown that effects of rail maintenance on VIV characteristics of triple-box girder are limited;highway wind barriers can deteriorate both vertical and torsional VIVs,while railway wind barriers can suppress VIVs;crash barriers can suppress vertical VIVs but can also induce torsional VIVs;compared with crash barriers,railway wind barriers perform better in suppressing VIVs,while highway wind barriers have a larger deteriorating effect on vertical VIVs compared to suppressing VIV effects of railway wind barriers and crash barriers;highway wind barriers are main excitation source of torsional VIV,and working conditions with highway wind barriers produce severe torsional VIVs.Finally,by using computational fluid dynamics numerical simulation,flow field characteristics of triple-box girder were analyzed,the results showed that attachments can promote generation and development of vortices in main beam gap,and intensify VIVs of triple-box girder.
作者
杨涵
郑史雄
马存明
YANG Han;ZHENG Shixiong;MA Cunming(Department of Bridge Engineering,School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Sichuan Provincial Key Lab for Wind Engineering,Chengdu 610031,China)
出处
《振动与冲击》
2025年第5期176-183,共8页
Journal of Vibration and Shock
关键词
三箱梁
风洞试验
附属设施
涡激振动(VIV)
计算流体力学
triple-box girder
wind tunnel test
attachments
vortex-induced vibration(VIV)
computational fluid dynamics
