并行类矩形断面的涡激振动特性  

Vortex-induced Vibration Characteristics of Tandem Rectangular Section

作　　者：段青松 张鸿 DUAN Qingsong;ZHANG Hong(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010

出　　处：《西南科技大学学报》2025年第1期53-59,共7页Journal of Southwest University of Science and Technology

基　　金：四川省自然科学基金(2022NSFSC1144);西南科技大学自然科学基金(21ZX7148)。

摘　　要：为探究考虑气动干扰效应的并行结构涡激振动特性,针对矩形和切角矩形断面开展节段模型风洞试验。0°风攻角时,考虑不同间距(L=2.9D,3.6D,4.3D和5.0D,L为两柱内侧面距离,D为断面顺风向宽度),分析上下游结构均自由振动、仅上游结构自由振动、仅下游结构自由振动3种情况的涡激振动特性变化规律。结果表明:对于矩形断面,当间距L=5.0D时,上游柱竖向涡振的无量纲振幅最大,比单幅柱时增大3%;间距L=2.9D,3.6D,4.3D时,下游柱的最大无量纲振幅为单幅柱时的17%,而间距L=5.0D时的涡振最大无量纲振幅增大为单幅柱的74%。对于切角矩形断面,间距L=2.9D时的上游柱竖向涡振无量纲振幅最大,为单幅柱的378%;在间距L<4.3D时,下游柱的最大无量纲振幅为单幅柱的35%,间距L=4.3D时的最大无量纲振幅为单幅柱的103%。上游柱的运动是导致下游柱竖向涡振振幅突然增大的原因;下游结构的运动对上游结构的竖向涡振的影响较小。研究结果可为类似工程抗风设计提供参考。To investigate the vortex-induced vibration(VIV)performance of tandem structures considering aerodynamic interference effect,sectional model wind tunnel tests were conducted for the rectangular and tangential sections.At wind attack angle of 0°,considering the influence of spacing L(2.9D,3.6D,4.3D,and 5.0 D,D was the girder section width),the VIV performance of the structure was investigated under three scenarios:free vibration,free vibration of only upstream structures,and free vibration of only downstream structures.The findings indicate that for the rectangular cross-section,when the spacing L is 5.0 D,the dimensionless VIV amplitude of the upstream column is the largest,increasing by 3%compared to that of a single column.The maximum VIV amplitude of the downstream structure is approximately 17%of that of a single structure at L<5.0 D.While,the maximum amplitude noticeably increases to 74%when the spacing is 5.0 D.For tangential rectangular sections,the dimensionless VIV amplitude in the upstream column is greatest at L=2.9D,which is 378%higher than that in the single structure.The maximum VIV amplitude in the downstream column is about 35%of that in the single structure at L<4.3D,increasing to 103%of that in the single structure when the spacing reaches 4.3 D.The vibration of the upstream column is the primary reason for the sudden increase in the maximum VIV amplitude of the downstream column.The vibration of the downstream rectangular column has minimal influence on the vertical VIV of the upstream rectangular section.The research findings can provide reference for wind-resistant design of similar engineering projects.

关 键 词：并行结构 气动干扰 风洞试验 涡激振动 

分 类 号：TU311.3[建筑科学—结构工程]