第 47卷 第 3期
2015年6月
西安建筑科技大学学报 (自然科学版)
J.Xi’an Univ.ofArch.&Tech.(Natural Science Edition)
Vl01.47No.3
Jun.2015
DOI:10.15986~.1006·7930.2015.03.01l
普 立 特 悬 索 桥 抖 振 响 应 时 域 分 析
黄 文 锋 , 邹 孔 庆 z,孙 建 鹏 , 王 美 芹
(1合肥工业大学,安徽 合肥 230009;2中铁四局集团钢结构有限公司,安徽 合肥 230022;3西安建筑科技大学,陕西 西安 710055)
摘要:普立特大桥是一座山区大跨悬索桥 ,为高柔的风敏感结构.在分析抗风性能时,利用ANSYS软件,建立了普立特悬
索桥的三维有限元模型,分析了该模型的动力特性 ,根据 Deodatis的谐波合成法模拟了桥梁的随机脉动风场并进行了检验,
然后基于准定常理论计算了作用于模型上的抖振力时程 ,自激力以单元气动刚度及阻尼矩阵的形式在 ANSYS中以Matrix27
矩阵输入,最后由时程分析求得桥梁在考虑与不考虑自激力作用时的抖振响应 .计算结果表明考虑 自激力后主要改变了桥梁
振动的平衡位置和在部分方向振动中起到正阻尼作用,为同类桥梁的抗风设计计算提供参考.
关键词:大跨度悬索桥;风场模拟;自激力;抖振;时域分析
中图分类号:TU352.2 文献标志码:A 文章编号 :1006—7930(2015)03—0371.05
Buffeting response analysis Of the suspension bridge in tim e dom ain
HUANG Wenfeng ;ZOUKongqing ’ ;SUNJianpeng~;WANG Meiqin
(1.Hefei University ofTechnology,Hefei 230009,China;2.Steel Structure Co.,Ltd.,China Railway Siju Civil Engineering Group,Hefei 230022.China;3.Xi’an Univ.ofArch.& Tech.,Xitan 710055,China)
Abstract:PLT Bridge iS a long.span suspension bridge in the hills which iS a high—rise flexible and wind sensitive structure.Thus. the wind.resistant capacity must be considered for the bridge.The 3D finite element model of bridge was established by using
ANSYS software,and its dynamic characteristics were then obtained.With spectral representation method proposed by Deodatis, fluctuating wind fields for the bridge were generated and validated.Then,the time—history of buffeting force was calculated by using
the quasi.steady theory.The self-excited forces are considered in forlTl of the element aerodynamic damping matrix and aerdynamic
stiffness matrix with MaMx 27 in ANSYS.Finally,buffeting analysis with and without considering self-excited forces in time domain were calculated by using time history analysis.The results show that,when considering self-exicted forces,it mainly changes
the equilibrium position of bridge vibration and the positive damping effect can be found in some directions of the bridge.This study can provide re:ference for the wind.resistant design of similar bridges.
Key words:long span suspension bridge;wind field simulation;self-excited forces;buffeting;time domain analysis
普立特 悬索 桥位于 云 南省宣 威市 境 内 ,横 跨深
度近 400m 的普立 大沟 ,是普 宣公路 全线 关键 控制
性工 程之一 .设 计采 用主桥 960 m 的双塔 单跨 悬索
桥 ,主桥 跨径布 置为 166+628+166 m.主 缆横 向布
置 两根 ,主缆横 桥 向 中心间距 为 26 1TI.上部结 构主
桥采 用 628 m 单跨简 支钢 箱加
普立特悬索桥抖振响应时域分析(论文).pdf