双边钢箱钢-混组合梁斜拉桥抖振响应分析  

Buffeting Response Analysis of Double Sided Steel Box Steel-Concrete Composite Girder Cable-stayed Bridge

作　　者：陈建兵[1] 陈星灿 王东伟 陈鑫[1] CHEN Jianbing;CHEN Xingcan;WANG Dongwei;CHEN Xin(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou,China,215011;No.2 Engineering Ltd of FHEC,Command Communication Control Center,Suzhou,China,215011)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011 [2]中交一公局第二工程有限公司,江苏苏州215011

出　　处：《沈阳建筑大学学报（自然科学版）》2023年第6期999-1008,共10页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(52178294)。

摘　　要：目的 对双边钢箱钢-混组合梁斜拉桥在不同风参数影响下的抖振响应进行分析,为此类斜拉桥设计提供参考。方法 以沾临黄河特大桥为工程背景,利用Fluent流体计算软件模拟得到主梁标准断面的三分力系数;基于谐波合成法,通过MATLAB编程模拟得到桥梁所在处的脉动风速时程曲线;基于Davenport抖振力模型,将脉动风速时程转化为抖振力时程;使用ANSYS进行不同风参数下的抖振时域分析。结果 风攻角在-7°~7°时,抖振扭转角在-7°时达到最大值,抖振横向位移在7°时达到最大值,因此在桥梁抗风设计中必须全面的考虑不同风攻角对桥梁结构抖振的影响;对整体结构而言,顺着主梁纵桥向各节点的抖振位移响应值与平均风速呈正相关;考虑气动导纳函数后,主梁跨中抖振横向位移响应RMS值减少了27.27%,扭转角RMS值减少了28.14%。结论 考虑气动导纳函数后会降低双边钢箱钢-混组合梁斜拉桥抖振响应,以0°风攻角、设计基准风速、忽略气动导纳为条件进行桥梁设计是偏保守的。Taking the Zhanlin Yellow River Bridge as the engineering background,the buffeting response of a double sided steel box steel concrete composite beam cable-stayed bridge under the influence of different wind parameters is analyzed,providing relevant reference for future design of this type of cable-stayed bridge.The three component force coefficients of the standard section of the main beam are simulated using Fluent fluid calculation software;Based on the harmonic synthesis method,the fluctuating wind speed time history curve at the bridge location is obtained through MATLAB programming simulation;Based on the Davenport buffeting force model,the fluctuating wind speed time history is converted into buffeting force time history;The buffeting time domain analysis under different wind parameters is performed using ANSYS.The analysis results show that when the wind attack angle is within the range of-7°to 7°,the buffeting torsional angle is the maximum at-7°,and the buffeting lateral displacement is the maximum at 7°.Therefore,the impact of different wind attack angles on the buffeting of bridge structures must be comprehensively considered in the wind resistance design of bridges;For the overall structure,the buffeting displacement response values of each node along the longitudinal bridge of the main beam are positively correlated with the average wind speed;After considering the aerodynamic admittance function,the RMS value of the buffeting lateral displacement response of the main beam midspan decreases by 27.27%,and the RMS value of the torsion angle decreases by 28.14%.It can be seen that considering the aerodynamic admittance function will reduce the buffeting response.In general,it is conservative to design bridges based on 0°wind attack angle,design reference wind speed,and ignoring aerodynamic admittance.

关 键 词：桥梁工程 大跨度斜拉桥 抖振 时域 风参数 

分 类 号：TU997[建筑科学—市政工程] U448.27[建筑科学—桥梁与隧道工程]