H型吊杆气动性能优化研究  

Optimization of aerodynamic performance of H-section hangers

作　　者：白桦[1] 李锐 郭聪敏 李加武[1] 张又进[4] BAI Hua;LI Rui;GUO Congmin;LI Jiawu;ZHANG Youjin(Research Center of Highway Large Structure Engineering on Safety,School of Highway,Chang’an University,Xi’an 710064,China;China Design Group Co.,Ltd.,Nanjing 210014,China;CCCC First Highway Consultants Co.,Ltd.,Xi’an 710075,China;Chongqing Communications Research&Design Institute Co.,Ltd.,China Merchants,Chongqing 400067,China)

机构地区：[1]长安大学公路学院公路大型结构安全教育部工程中心,西安710064 [2]中设设计集团股份有限公司,南京210014 [3]中交第一公路勘察设计研究院有限公司,西安710075 [4]招商局重庆交通科研设计院有限公司,重庆400067

出　　处：《振动与冲击》2020年第17期186-193,共8页Journal of Vibration and Shock

基　　金：国家重点基础研究发展计划(973计划2015CB057702);中国博士后科学基金项目(2014M560737);中国博士后科学基金特别资助项目(2016T90876);陕西省自然科学基础研究计划面上项目(2020JM-241);长安大学中央高校基本科研业务费专项资金(300102210208)。

摘　　要：针对H型吊杆易发生驰振失稳的问题,以曾家岩嘉陵江大桥H型吊杆为研究背景,通过节段模型测振试验和CFD数值模拟的方法分别研究了腹板、翼板在较低开孔率下单独开孔以及腹板、翼板同时开孔时开孔率对吊杆气动性能的影响规律;同时为规避开孔断面可能出现压杆失稳的风险,首次提出了在腹板两侧设置气动稳定板的抑振措施,通过多工况对比试验得到气动稳定板尺寸参数的最优取值,并从驰振系数及流场可视化图的角度解释了气动稳定板的抑振机理,证明了此新型抑振措施的有效性。整体结果表明:原断面存在驰振现象;腹板或翼板在较低开孔率下单独开孔并不能避免驰振的发生;腹板和翼板同时开孔能消除驰振现象,但一定程度上会产生竖弯涡振现象,增大翼板开孔率可降低涡振幅值,但腹板开孔率并不是越高越好,而是存在一个较优区间,腹板和翼板开孔率分别为5.6%和16.7%左右时可在抑制驰振的同时消除涡振现象。气动稳定板措施可有效避免驰振的发生,但会滋生小幅度的竖弯涡振现象,稳定板底部与腹板之间的相对缝隙距离B 1/B以及稳定板顶部与翼板间相对竖直距离B 2/B均对吊杆涡振性能有很大影响,其中B 1/B<0时无法抑制驰振现象,在有效影响范围内两个无量纲参数的值越大对于涡振的抑振效果越好;当B 1/B=1/3且B 2/B=2/3时,吊杆断面既无驰振也无涡振现象发生。Aerodynamic instabilities of H-section hangers of Jialing River Bridge,Chongqing were investigated through sectional model wind tunnel tests.Effects of opening rate of web and wing on aerodynamic performance of hangers were studied during lower opening rate of web and wing under different opening conditions were studied using CFD numerical simulation.Meanwhile,in order to avoid the risk of pressure bars’instability,a new vibration-suppressing measure using aerodynamic stabilizers at sides of web was proposed for the first time,and the optimal size parameters of aerodynamic stabilizers were obtained with multi-condition contrastive tests.The vibration suppression mechanism of aerodynamic stabilizers was explained with galloping coefficient and visualization figures of flow field to verify the effectiveness of the new vibration-suppressing measure.Results showed that galloping phenomenon exists in the original section and it still exists for a single opening section of web or wing with a lower opening rate;simultaneous opening of web and wing can eliminate galloping but generate vertical bending vortex-induced vibration(VIV);there exists a preferable interval for web perforation ratio to eliminate galloping and reduce amplitude of VIV;amplitude of VIV can be reduced with increase in opening rate of wing;galloping and VIV can be simultaneously eliminated when opening rate of web is 5.6%and that of wing is about 16.7%;the measure of aerodynamic stabilizers can effectively avoid galloping of H-section hangers but generate vertical bending VIV;values of parameters B 1/B and B 2/B have great influence on hangers’VIV performance,there exists galloping phenomenon when B 1/B<0,within their effective influence ranges of B 1/B and B 2/B,the greater the parameters B 1/B and B 2/B,the better the VIV-suppressing effect,when B 1/B=1/3 and B 2/B=2/3,there is neither galloping nor VIV in section of hangers.

关 键 词：H型吊杆 驰振 涡振 风洞试验 开孔率 气动稳定板 

分 类 号：U443.35[建筑科学—桥梁与隧道工程]