| 复杂格构式梁体三分力系数精细化计算分析 |
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| 引用本文： | 郭健,朱敏俊,孙博,赵钦.复杂格构式梁体三分力系数精细化计算分析[J].中国公路学报,2019,32(5):80-87. |
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| 作者姓名： | 郭健 朱敏俊 孙博 赵钦 |
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| 作者单位： | 浙江工业大学 桥梁工程研究所, 浙江 杭州 310023 |
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| 基金项目： | 国家自然科学基金项目（51578506）；国家自然科学基金联合重点项目（U1709207）；国家重点研发计划项目（2016YFC0802201） |
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| 摘 要： | 考虑索承桥梁中格构式梁体具有多种截面形式复合的特点,其抗风性能难以通过常用的二维数值仿真来分析,以东部沿海一座格构式拱桥为研究背景,考虑格构式系梁的结构特点和栏杆等附属设施的影响,建立三维数值仿真模型,对格构式系梁的静力三分力系数进行精细化分析。基于不同计算区域的模拟精度需求,采用不同方法进行混合网格划分;针对复杂格构式系梁的流场特征,优化选取流场尺度规模、边界条件和湍流模型等计算参数分析获得大范围风攻角下的三分力系数;将所得结果与风洞试验结果进行对比分析,并探讨栏杆等附属设施对三分力系数的影响以及数值模拟误差与风涡特性的相关性。结果表明:在小风攻角范围(±4°)内,有栏杆的三维数值模拟具有较高的精度;栏杆等附属设施对格构式梁体的抗风性能有一定影响,考虑栏杆等附属设施的精细化数值模拟比不考虑栏杆的计算误差平均降低20%,且增加了梁体所受的静风荷载,在实际工程中应当对栏杆等附属设施予以重视;不同风攻角下的风涡特性与数值仿真的误差存在相关性,随着风攻角的增大梁侧的风涡效应明显,这使得三维数值仿真的误差开始增大,尤其是在正大风攻角的情况下模拟精度下降严重。
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| 关 键 词： | 桥梁工程 格构式系梁 抗风性能 三分力系数 |
| 收稿时间： | 2018-01-15 |
Refined Study on Three-component Force Coefficients of Complicated Lattice Girder |
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| GUO Jian,ZHU Min-jun,SUN Bo,ZHAO Qin.Refined Study on Three-component Force Coefficients of Complicated Lattice Girder[J].China Journal of Highway and Transport,2019,32(5):80-87. |
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| Authors: | GUO Jian ZHU Min-jun SUN Bo ZHAO Qin |
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| Affiliation: | Institute of Bridge Engineering, Zhejiang University of Technology, Hangzhou 310023, Zhejiang, China |
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| Abstract: | Wind-resistance performance for the lattice girder of a cable-supported bridge is difficult to obtain with two-dimensional numerical simulations owing to the combined cross-section types. The refined study on the static three-component force coefficients for a lattice arch bridge in the East China Sea was proposed and conducted. The refined three-dimensional (3D) numerical model of the lattice girder was established with emphasis on specific structural properties and influence of ancillary facilities. Structural and non-structural meshing methods were applied to different computation zones based on different simulation requirements. The scale of the flow field, boundary conditions, turbulence model, and other computational parameters were selected and optimized to realize the simulation analysis for a wide range of wind attack angles. The obtained three-component force coefficients were compared with the wind tunnel test results. The influence of the ancillary facilities on the three-component force coefficients and the correlation between numerical simulation error and wind vortex were discussed. The results show that the 3D numerical simulation considering ancillary facilities has verified prediction accuracy for the bridge wind-resistance assessment in a small wind attack angle range (±4°). The ancillary facilities have a great influence on the 3D numerical simulation; the simulation error shows an average of 20% decrease when the ancillary facilities are considered while the aerostatic loads increase when considering these facilities in the simulation. The simulation error has a strong correlation with the wind vortex properties for different wind attack angles. The wind vortex effects develop rapidly with the increase of the absolute value of the wind attack angle, thus resulting in the increase of the simulation error, especially for the condition of positive wind attack angle. |
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| Keywords: | bridge engineering lattice girder wind resistant performance three-component force coefficient |
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