基于CFD模拟的钢管桁主梁气动特性研究  

Study on Aerodynamic Characteristics of Steel Tube Truss Girder Based on CFD Simulation

作　　者：刘雪峰 马立秋 LIU Xuefeng;MA Liqiu

机构地区：[1]深圳市综合交通设计研究院有限公司,广东深圳518003 [2]北京市轨道交通建设管理有限公司,北京市100000

出　　处：《城市道桥与防洪》2022年第1期196-199,207,M0018,共6页Urban Roads Bridges & Flood Control

摘　　要：基于计算流体力学方法,以深圳市拟建山谷沟壑处景观桥为研究对象,建立三维仿真节段模型进行气动性能研究。首先研究节段桁架模型在对称边界条件下的合理性,得出可以利用节段模型来代替三维整桥进行数值模拟。然后通过比较三维整桥模拟与国内现行规范中桁架桥气动参数选取方法,做出检验并提出改进建议。以桁架桥结构截面的外轮廓和实面积比作为控制条件建立二维等效模型,采用4种二维圆管桁主梁CFD计算简化模型,并计算了在-5°、-3°、0°、3°、5°攻角情况下的桁架桥梁静力三分力系数。同时基于非定常时程曲线,对4种二维等效模型附近的空间流场结构、涡振性能差异进行了对比。Based on the computational fluid dynamics(CFD)method,taking a landscape bridge to be constructed at a valley of Shenzhen as the study object,a three-dimensional segmental simulation model is established to study the aerodynamic performance.Firstly,the rationality of segment truss model is studied under the symmetric boundary condition,and it is concluded that the segment model can be used to replace the three-dimensional complete bridge for numerical simulation.Then,by comparing the three-dimensional complete bridge simulation with the selection method of aerodynamic parameters of truss bridge in the current domestic code,the inspection is made and the suggestions for improvement are put forward.The two-dimensional equivalent model is established by taking the outer contour and real area of the structural section of truss bridge as the control conditions.Four kinds of two-dimensional circular tube truss girder CFD calculation simplified model are used to calculate the static tripartite force coefficients of truss bridge at-5°,-3°,0°,3°and 5°angles of attack.At the same time,based on an unsteady time history curve,the spatial flow structures and vortex-vibration performances of the four two-dimensional equivalent models are compared.

关 键 词：圆钢管桁架桥 静力三分力系数 数值模拟 二维等效模型 涡激振动 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]