广州新光大桥静风稳定性风洞试验与数值分析  

Wind Tunnel Test and Wind-Induced Static Stability Numerical Analysis of Guangzhou Xinguang Bridge

作　　者：陈晓冬[1] 王小松[1] 赵林[1] 葛耀君[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室

出　　处：《结构工程师》2007年第6期43-48,共6页Structural Engineers

基　　金：国家自然科学基金面项目(50278069);(50408035);福州大学科技发展基金(2003-XY-10)联合资助

摘　　要：广州新光大桥主桥为177 m+428 m+177 m中承式三跨连续刚桁拱桥,位处台风多发的南部沿海区域,其静风稳定问题在施工阶段和运营状态下较为突出。设计并加工了1∶100缩尺比的新光大桥全桥气弹模型,为确保结构气动外形精确相似,将双箱形拱肋截面的形心位置偏移到拱肋的箱形下弦内部,采用微调拱肋顶部截面的抗弯刚度、主梁质量分布等手段较好地模拟桥梁的各阶振型和频率,克服了大跨度拱桥气弹模型设计中弯扭刚度和轴向刚度缩尺比不协调的问题。均匀流场中全桥气弹模型静风稳定性试验结果与基于主梁和拱肋二维节段模型测力风洞试验的全桥三维静风稳定性数值结果进行了对比和分析,并初步探讨了良态及台风气候模式下结构静风位移响应的差别。Guangzhou Xinguang Bridge is a half-through steel truss arch bridge with spans of 177 m ＋428 m ＋ 177 m,and located in the coastal area of South China where typhoon occurs frequently, therefore the bridge may have a problem of wind-induced static stability in stage of both construction and operation. In order to guarantee the shape similarity, the steel frame of arch was located in the bottom box of arch and several measures were adopted to make up the full aeroelastic model with scaling ratio of 1： 100. A numerical analysis of wind-induced static stability was carried out based on coefficients of tri-component forces obtained via a sectional model wind tunnel test for wind force measurement. The wind tunnel test of aeroelastic model for windinduced static stability was conducted in smooth flow and the result was compared with that of numerical analysis. The difference of wind-induced static displacement response between normal climate mode and typhoon climate mode was also discussed.

关 键 词：拱桥 静风稳定 风洞试验 数值分析 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]