車致氣流激勵簡化算法的參數(shù)分析*
趙銳1，張毅剛2
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（1 新疆大學(xué)建筑工程學(xué)院， 烏魯木齊 830046； 2 北京工業(yè)大學(xué)空間結(jié)構(gòu)研究中心， 北京 100124）
［摘要］基于車輛從人行天橋下通過的三維流場網(wǎng)格模型，將連續(xù)鋼箱梁人行天橋車致氣流激勵的簡化算法進行了細化，使這一算法不僅以車速為參數(shù)，還考慮了不同車輛尺寸和不同橋面寬度的影響，提出了車高系數(shù)、車寬系數(shù)及橋面寬度系數(shù)，同時得出結(jié)論：不同車長時計算得到的車致氣流激勵對人行天橋振動的影響不大。最后對北京工業(yè)大學(xué)西門人行天橋進行了現(xiàn)場風壓監(jiān)測，將測點的監(jiān)測結(jié)果與理論分析結(jié)果相對比，驗證所采用的分析方法的合理性。［關(guān)鍵詞］車致振動; 氣流激勵; 簡化算法; 參數(shù)分析; 風壓監(jiān)測中圖分類號：U448.11 文獻標識碼：A 文章編號：1002-848X(2016)07-0093-06
Parametric analysis of simplified algorithm of vehicle-induced airflow excitationZhao Rui1, Zhang Yigang2（1 School of Civil Engineering, Xinjiang University, Urumqi 830046, China; 2 Space Structures Research Center, Beijing University of Technology, Beijing 100124, China)Abstract: Based on three-dimensional flow field mesh model that vehicle passed from the pedestrian bridge underneath, simpilfied algorithm of vehicle-induced airflow excitation of continuous steel box girder pedestrian bridge was refined. This method took speed as parameter, and considered the influences of the different vehicle sizes and deck width. Vehicle height coefficient, vehicle width coefficient and deck width coefficient were proposed. Results revealed that vehicle-induced airflow excitation calculated at different vehicle length has little effect on the pedestrian bridge. Finally, Beijing University of Technology, Simon footbridge was monitored on-site for wind pressure, the monitoring results of measuring points compared with the theoretical analysis results to verify the reasonableness of analysis methods.Keywords: vehicle-induced vibration; airflow excitation; simplified algorithm; parametric analysis; wind pressure monitoring
*新疆大學(xué)博士畢業(yè)生科研啟動基金項目（批準號：BS150256）。作者簡介：趙銳，博士，講師，Email:zhaor1999@163.com。
