基于监测大数据的涡激振动影响因素分析
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摘要
为从监测大数据中提取影响桥梁涡激振动的特征参数,及时预测涡激振动,以某跨海大桥为背景,对该桥2013～2015年的涡激振动监测数据进行梳理,分析风参数以及能量集中系数等结构振动响应因素在涡激振动中的特异性,根据涡激振动特征参数建立动态监控模型,并应用于该桥中。结果表明:涡激振动主要发生在顺风向平均风速为4～13m/s低风速以及300°～330°、120°～150°风向角间;竖向平均风速、风攻角、湍流度、阵风因子均不宜作为涡激振动预测分析参数;能量集中系数与加速度均方根值可作为桥梁是否发生涡激振动的进一步判断条件;涡激振动动态监控模型可及时预测涡激振动,且实际应用效果较好。
In order to extract the characteristic parameters that affect the vortex-induced vibration from monitoring data and timely predict the behavior of vortex-induced vibration,taking a cross-sea bridge for example,we analyzed the monitoring data of vortex-induced vibration of the bridge from 2013 to 2015,and studied the specificity of structural vibration response factors such as wind parameters and energy concentration coefficient in vortex induced vibration.Moreover,we established a dynamic monitoring model according to characteristics of vortex-induced vibration.The results show that the vortex-induced vibration mainly occurs in low wind speed with an average wind speed of 4-13 m/s,and with wind angles of 300°-330°and 120°-150°.The parameters such as the vertical average wind speed,wind attack angle,turbulence intensity and gust factors are not suitable for predicting and analyzing vortex-induced vibration.The energy concentration coefficient and the root mean square value of acceleration can be used as further criteria for judging the occurrence of vortex-induced vibration of bridges.The dynamic monitoring model for vortexinduced vibration can be adopted to timely predict vortex-induced vibration,and can be effectively applied in practical engineerings.
In order to extract the characteristic parameters that affect the vortex-induced vibration from monitoring data and timely predict the behavior of vortex-induced vibration,taking a cross-sea bridge for example,we analyzed the monitoring data of vortex-induced vibration of the bridge from 2013 to 2015,and studied the specificity of structural vibration response factors such as wind parameters and energy concentration coefficient in vortex induced vibration.Moreover,we established a dynamic monitoring model according to characteristics of vortex-induced vibration.The results show that the vortex-induced vibration mainly occurs in low wind speed with an average wind speed of 4-13 m/s,and with wind angles of 300°-330°and 120°-150°.The parameters such as the vertical average wind speed,wind attack angle,turbulence intensity and gust factors are not suitable for predicting and analyzing vortex-induced vibration.The energy concentration coefficient and the root mean square value of acceleration can be used as further criteria for judging the occurrence of vortex-induced vibration of bridges.The dynamic monitoring model for vortexinduced vibration can be adopted to timely predict vortex-induced vibration,and can be effectively applied in practical engineerings.
引文
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[12]何晗欣,李加武,周建龙.中央开槽箱形断面斜拉桥的涡激振动试验与分析[J].桥梁建设,2012,42(2):34-40.(HE Han-xin,LI Jia-wu,ZHOU Jian-long.Testing and Analysis of Vortex-Excited Vibration of Central Slotted Box Section Cable-Stayed Bridge[J].Bridge Construction,2012,42(2):34-40.in Chinese)
[13]管青海,崔欣,王方亮,等.气动措施抑制钝体箱梁竖向涡振的风洞试验研究[J].桥梁建设,2014,44(1):56-62.(GUAN Qing-hai,CUI Xin,WANG Fang-liang,et al.Wind Tunnel Test Study of Vertical Vortex-Induced Vibration of Bluff Box Girder Suppressed by Aerodynamic Measure[J].Bridge Construction,2014,44(1):56-62.in Chinese)
[2]Li Shan-wu,Laima Shu-jin,Li Hui.Cluster Analysis of Winds and Wind-Induced Vibrations on a Long-Span Bridge Based on Long-Term Field Monitoring Data[J].Engineering Structures,2017,138:245-259.
[3]Li Shan-wu,Laima Shu-jin,Li Hui.Data-Driven Modeling of Vortex-Induced Vibration of a Long-Span Suspension Bridge Using Decision Tree Learning and Support Vector Regression[J].Journal of Wind Engineering and Industrial Aerodynamics,2018,172:196-211.
[4]Li Hui,Laima Shu-jin,Zhang Qiang-qiang,et al.Field Monitoring and Validation of Vortex-Induced Vibrations of a Long-Span Suspension Bridge[J].Journal of Wind Engineering and Industrial Aerodynamics,2014,124:54-67.
[5]Li Hui,Laima Shu-jin,Ou Jin-ping,et al.Investigation of Vortex-Induced Vibration of a Suspension Bridge with Two Separated Steel Box Girders Based on Field Measurements[J].Engineering Structures,2011,33(6):1 894-1 907.
[6]Zhu Le-dong,Meng Xiao-liang,Du Lin-qing,et al.ASimplified Nonlinear Model of Vertical Vortex-Induced Force on Box Decks for Predicting Stable Amplitudes of Vortex-Induced Vibrations[J].Engineering,2017,3(6):854-862.
[7]Xu Kun,Zhao Lin,Ge Yao-jun.Reduced-Order Modeling and Calculation of Vortex-Induced Vibration for Large-Span Bridges[J].Journal of Wind Engineering and Industrial Aerodynamics,2017,167:228-241.
[8]刘小兵,张海东,刘庆宽.大攻角下分离双钢箱梁间距对涡振特性的影响[J].振动与冲击,2017,36(14):202-207.(LIU Xiao-bing,ZHANG Hai-dong,LIU Qing-kuan.Influence of Spacing of Separated Twin Steel Box Girders on Vortex-Induced Vibration Characteristics Under a Large wind Attacking Angle[J].Journal of Vibration and Shock,2017,36(14):202-207.in Chinese)
[9]杨咏漪,陈克坚,李明水,等.韩家沱长江大桥高低雷诺数涡激振动试验研究[J].桥梁建设,2015,45(3):76-81.(YANG Yong-yi,CHEN Ke-jian,LI Ming-shui,et al.Test Study of Vortex-Induced Vibration of Hanjiatuo Changjiang River Bridge at High and Low Reynolds Numbers[J].Bridge Construction,2015,45(3):76-81.in Chinese)
[10]杨阳,张亮亮,吴波,等.宽体扁平钢箱梁气动力特性及涡振性能研究[J].桥梁建设,2016,46(1):70-75.(YANG Yang,ZHANG Liang-liang,WU Bo,et al.Study of Aerodynamic Characteristics and Vortex-Induced Vibration Performance of Wide Flat Steel Box Girder[J].Bridge Construction,2016,46(1):70-75.in Chinese)
[11]崔欣,王慧贤,管青海,等.栏杆透风率对主梁涡振特性影响的风洞试验[J].长安大学学报(自然科学版),2018,38(3):71-79.(CUI Xin,WANG Hui-xian,GUAN Qing-hai,et al.Wind Tunnel Experimental on Influence of Railing Ventilation Rate on Characteristics of Vortex-Induced Vibration of Main Girder[J].Journal of Chang′an U-niversity(Natural Science Edition),2018,38(3):71-79.in Chinese)
[12]何晗欣,李加武,周建龙.中央开槽箱形断面斜拉桥的涡激振动试验与分析[J].桥梁建设,2012,42(2):34-40.(HE Han-xin,LI Jia-wu,ZHOU Jian-long.Testing and Analysis of Vortex-Excited Vibration of Central Slotted Box Section Cable-Stayed Bridge[J].Bridge Construction,2012,42(2):34-40.in Chinese)
[13]管青海,崔欣,王方亮,等.气动措施抑制钝体箱梁竖向涡振的风洞试验研究[J].桥梁建设,2014,44(1):56-62.(GUAN Qing-hai,CUI Xin,WANG Fang-liang,et al.Wind Tunnel Test Study of Vertical Vortex-Induced Vibration of Bluff Box Girder Suppressed by Aerodynamic Measure[J].Bridge Construction,2014,44(1):56-62.in Chinese)