黄茅海大桥扭转涡振气动措施展向布局优化  

Spanwise Layout Optimization of Aerodynamic Countermeasures Against Torsional Vortex-induced Vibration on Huangmaohai Bridge

作　　者：孙颢 郭国和 朱青[1,4] 朱乐东[1,4] 檀忠旭 权红烈 SUN Hao;GUO Guo-he;ZHU Qing;ZHU Le-dong;TAN Zhong-xu;QUAN Hong-lie(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;Guangdong Highway Construction Co.Ltd.,Guangzhou 510623,Guangdong,China;Huangmaohai Cross-sea Channel Management Center,Zhuhai 519000,Guangdong,China;Key Laboratory of Transport Industry of Bridge Wind Resistance Technology,Tongji University,Shanghai 200092,China;China Railway Baoji Bridge Group Co.Ltd.,Baoji 721006,Shaanxi,China)

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]广东省公路建设有限公司,广东广州510623 [3]黄茅海跨海通道管理中心,广东珠海519000 [4]同济大学桥梁结构抗风技术交通运输行业重点实验室,上海200092 [5]中铁宝桥集团有限公司,陕西宝鸡721006

出　　处：《中国公路学报》2024年第10期98-106,共9页China Journal of Highway and Transport

基　　金：国家重点研发计划项目(2022YFC3005300);交通运输行业重点科技项目(2020-MS1-004);国家自然科学基金项目(51938012)。

摘　　要：通过大比例节段模型风洞试验发现,黄茅海大桥主梁原始断面在试验中出现的扭转涡振可通过部分封闭检修道栏杆来控制,但如果将该气动措施通长布置在主梁上则会显著增大结构侧向风荷载。为了确定主梁展向所需的气动措施最短布置长度和相应的布置范围,首先通过节段模型风洞试验识别了采取气动措施前后2种主梁断面的涡激力模型参数,然后基于涡激力模型逐模态分析了实桥的三维涡振响应,最后以实桥不发生涡振作为约束条件优化了气动措施的展向布局。结果表明:部分封闭检修道栏杆减小了扭转涡激力的气动负阻尼效应,从而抑制了主梁断面的扭转涡振,但将其通长布置在主梁上过于保守;利用所提方法优化该气动措施的展向布局后,可大幅缩减气动措施的展向布置长度。Wind tunnel tests on a large-scale sectional model of the Huangmaohai Bridge indicated that torsional vortex-induced vibration(VIV)of its deck can be suppressed by partially closing its railings.However,installing such aerodynamic countermeasures along the entire span of the bridge deck could significantly increase the lateral wind load.To determine the minimum required installation length of aerodynamic countermeasures and the corresponding installation locations along the span,the parameters of a nonlinear vortex-induced force(VIF)model for bridge deck sections with and without aerodynamic countermeasures were identified using wind tunnel tests.The VIF model was subsequently applied to conduct a mode-by-mode analysis of the VIV response of a prototype bridge with countermeasures.Finally,the spanwise layout of the aerodynamic countermeasures was optimized considering the constraint of a limited VIV response on the bridge.The results indicate that the partial closure of the railings suppresses the torsional VIV of the bridge deck section by reducing the negative aerodynamic damping effect of the VIF.However,installing such countermeasures over an entire span is overly conservative;the total installation length of aerodynamic countermeasures can be significantly reduced by optimizing their spanwise layout using the proposed method.

关 键 词：桥梁工程 涡振 气动措施 展向布局 优化 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]