宽体式扁平钢箱梁颤振特性分析  

Analysis on Flutter Characteristics of Wide Flat Steel Box Girder

作　　者：张亮亮[1] 游志雄 符健 ZHANG Liangliang;YOU Zhixiong;FU Jian(School of Civil Engineering,Chongqing University,Chongqing 400045,China;4th Design Institute,Central and Southem China Municipal Engineering Design&Research Institute Co.Ltd.,Wuhan Hubei 430019,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]中国市政工程中南设计研究总院有限公司第四设计院,湖北武汉430019

出　　处：《铁道建筑》2018年第7期9-13,29,共6页Railway Engineering

基　　金：国家自然科学基金(51578098);重庆市建委科技项目(20130844)

摘　　要：以重庆寸滩长江大桥(250+880+250)m主桥为工程背景,结合数值模拟和风洞试验2种方法对宽体式扁平钢箱梁的颤振特性进行研究。通过主梁节段模型风洞试验,测定该模型在成桥态和施工态的颤振临界风速,并采用自由振动法对模型的颤振导数进行识别;使用FLUENT软件计算主梁模型的颤振导数,并由Scanlan提出的计算方法获得其颤振临界风速。结果表明:主梁上附属结构对主梁的颤振稳定性产生不利作用,因此在设计时应慎重考虑附属结构的设置;桥梁颤振临界风速可通过数值模拟方法进行预估,并可运用于桥梁的初步设计;由数值模拟方法计算求得模型的颤振导数,与扭转相关的精度远高于与竖弯相关的精度。In order to study the flutter characteristics ofthe wide flat steel box girder,the Chongqing Cuntan Yangtze River Bridge was analyzed as the engineering background,focusing on the simulation and wind tunnel test ofthe flutter characteristics ofwide flat steel box girder.The critical flutter wind speed ofthe bridge was measured through the wind tunnel test ofthe main girder segment model,and the flutter derivatives could be identified by the free vibration method.The flutter derivatives ofthe main girder model were studied using FLUENT,and the critical flutter wind speed was obtained based on the method given by Scanlan.The results show that the subordinate structure on the main girder has side effects on the flutter stability,thereby requiring a reasonable design ofsubordinate structure.The critical flutter wind speed ofthe bridge may be calculated through simulation and it may be used for the preliminary design ofthe bridge.Among the calculated flutter derivatives through simulation,the accuracy ofthe derivative related to torsion is much higher than that ofthe derivative related to vertical flexure.

关 键 词：公路桥梁 颤振特性 数值计算 宽体式扁平钢箱梁 风洞试验 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U443.35[交通运输工程—道路与铁道工程]