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流线型桥梁断面表面脉动风荷载特性研究 被引量:1

THE CHARACTERISTICS OF FLUCTUATING WIND LOAD ON THE SURFACE OF A STREAMLINED BRIDGE SECTION
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摘要 气动力是大跨度桥梁抗风稳定性检算和振动分析的基础,流线型桥梁断面的气动力随雷诺数的变化问题是风工程研究和桥梁设计关注的问题。通过风洞试验,研究表面风压分布随雷诺数的变化规律,可以分析雷诺数效应发生的机理。通过刚性节段模型测压试验,获得了模型表面风压分布随雷诺数的变化,采用基于功率谱密度矩阵的特征正交分解方法,从频域上分析了结构表面的脉动压力场,解析了流线型桥梁断面表面脉动风荷载的主要分布形式和作用频率,分析了雷诺数变化对结构表面脉动压力场的影响。研究发现:流线型桥梁断面表面脉动风荷载的作用形式会随雷诺数的改变而改变,在特定位置流动分离和再附等现象会随雷诺数发生变化,从而影响整体的气动力和漩涡脱落规律。 Aerodynamic force is the basis of wind resistance calculation and vibration analysis of long-span bridges.The change of aerodynamic force with the Reynolds number of streamlined bridge sections is a concern of wind engineering research and bridge design.Through a wind tunnel test,the law of surface wind pressure distribution with the Reynolds number is studied.The mechanism of the Reynolds number effect was analyzed.The variation of the wind pressure distribution with the Reynolds number on the surface of the model is obtained through a rigid segment model pressure wind tunnel test.Through the characteristic orthogonal decomposition method based on the power spectral density matrix,the fluctuating pressure field of the structure surface is analyzed in the frequency domain.The main distribution pattern and frequency of the fluctuating wind load on the streamlined bridge section are analyzed.The effect of the Reynolds number on the fluctuating pressure field of the structure is also analyzed.It is found that the action of fluctuating wind load on the surface of a streamlined bridge changes with the Reynolds number,and that the flow separation and repayment at a specific position change with the Reynolds number and affect the overall aerodynamic force and the vortex shedding law.
作者 李海飞 梁新华 孙一飞 崔会敏 刘庆宽 LI Hai-fei;LIANG Xin-hua;SUN Yi-fei;CUI Hui-min;LIU Qing-kuan(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;China Railway International Group,Beijing 100039,China;Department of Mathematics and Physics,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Wind Engineering Research Center,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China)
出处 《工程力学》 EI CSCD 北大核心 2020年第S01期242-248,260,共8页 Engineering Mechanics
基金 国家自然科学基金项目(51778381,11802186) 河北省自然科学基金项目(E2018210044,E2018210113) 河北省高等学校高层次人才项目(GCC2014046) 河北省高等学校科学技术研究项目(BJ2019004)。
关键词 流线型桥梁断面 脉动风荷载 功率谱密度矩阵分解 特征值谱 主模态 streamlined bridge section pulsating wind load SPT eigenvalue spectrum main mode
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