门型桥塔驰振气动干扰效应数值模拟  

Numerical Simulation on the Galloping Performance of Portal Type Bridge Tower Considering the Aerodynamic Interference Effect

作　　者：李胜利[1,2] 张通[3,4] 陈淮[1] 欧进萍[2,5] 

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [3]三门峡市公路局,河南三门峡472000 [4]河南省交通科学技术研究院有限公司,河南郑州450000 [5]大连理工大学土木工程学院,辽宁大连116024

出　　处：《中国铁道科学》2012年第1期27-34,共8页China Railway Science

基　　金：国家自然科学基金重点资助项目(50538020);"十一五"国家科技支撑计划重点项目(2006BAJ03B04);中国博士后科学基金资助项目(2011M501190);高等学校博士学科点专项科研基金资助项目(20114101120008)

摘　　要：针对大跨径悬索桥施工期门型变截面桥塔的驰振问题,提出一种有限元与计算流体动力学CFD相结合分析变截面高耸结构驰振的实用数值方法。以东海某大跨径悬索桥北桥塔为例,运用该方法,考虑塔柱间的气动干扰效应,进行门型桥塔施工期典型工况的驰振性能分析。结果表明:纵桥向门型桥塔整体和其单根塔柱的驰振力系数均大于0,不存在驰振失稳的可能性;在横桥向,由于门型桥塔受塔柱间气动干扰效应的影响,其驰振性能与不考虑气动干扰时的不同,且倒角截面对门型桥塔驰振性能不利;矩形截面和倒角截面前柱的驰振力系数均大于0,后柱的驰振力系数均存在小于0的情况,且后柱驰振力系数的绝对值大于门型桥塔整体的驰振力系数绝对值;在进行门型桥塔施工期驰振分析时,当无横梁时,要重点研究后柱横桥向的驰振性能。To solve the galloping problem of portal type bridge tower with variable section during the construction of long-span suspension bridge,a practical numerical method for analyzing the galloping performance of high-rise structure with variable section was advanced by combining finite element with CFD.Taking the north bridge tower of certain long-span suspension bridge of East China Sea for example,this method was adopted to analyze the galloping performance under typical working condition during the construction of portal type bridge tower considering the aerodynamic interference effect between twin columns.Results show that no galloping instability will happen in longitudinal direction since the galloping coefficients of both the twin columns and single column for portal type bridge tower are greater than zero.In the lateral direction,because the portal type bridge tower is influenced by the aerodynamic interference effect between twin columns,its galloping performance is different from that without considering the aerodynamic interference,and the chamfer section is disadvantageous for the galloping performance of portal type bridge tower.The galloping coefficients of anterior column with rectangular and chamfer sections are greater than zero,but those of posterior columns are less than zero,and the absolute values of the galloping coefficients for posterior column are larger than those for the total of the portal type bridge tower.Accordingly,the galloping performance of the posterior column in the lateral direction without crossbeams should be mainly researched in galloping analysis during the construction of portal type bridge tower.

关 键 词：悬索桥 门型桥塔 驰振 暂态结构 气动干扰效应 数值模拟 

分 类 号：U44[建筑科学—桥梁与隧道工程]