斜拉桥拉索减振阻尼器对拉索索力测量的影响研究
|
摘要
针对采用频率法测量拉索索力时拉索外加阻尼器对索力测量精度影响的问题,提出了考虑拉索垂度的拉索-阻尼器系统模态频率的分析方法,研究了阻尼器安装的相对高度、拉索的计算长度、阻尼系数等对拉索模态频率的影响程度和规律,获得了消除拉索减振阻尼器对索力测量精度影响的办法。研究表明,外加阻尼器对拉索低阶模态频率影响很大,采用高阶模态频率测量拉索索力时,索力测量能获得很好的精度。随着拉索-阻尼器系统相对安装长度和阻尼系数的增大,阻尼器对拉索模态频率的影响也越大,当阻尼系数增加到一定程度后,拉索的高阶模态频率基本与阻尼系数无穷大时的频率接近,阻尼器相当于固定支撑。以岳阳洞庭湖大桥A11号拉索为例,验证了该方法合理可行。
For tension precise measurement of stay cable with external dampers by using vibration frequency method,the analyzing method of modal frequency of cable-damper system which considers cable sag was proposed.The influence extent and rules of the modal frequency of cable versus the relative height of damper installment,effective length of cable and damper coefficient were analysed,and the method to overcome the influence of cable damper upon measuring accuracy of cable tension was proposed.The research results show that low modal frequencies of cable are changed obviously due to external dampers and the measurement precision of tension can be obtained with high modal frequencies.The results also show that the influence of damper on modal frequency increases with the increases of relative height of damper installment and damper coefficient,and the high modal frequencies of cable close to the frequencies when damper coefficient increases to infinity and location of damper is equivalent to fixed support.The proposed method was verified with stay cable No.A11 of Dongting Lake Bridge of Yueyang.It indicates that the method is reasonable and feasible.
For tension precise measurement of stay cable with external dampers by using vibration frequency method,the analyzing method of modal frequency of cable-damper system which considers cable sag was proposed.The influence extent and rules of the modal frequency of cable versus the relative height of damper installment,effective length of cable and damper coefficient were analysed,and the method to overcome the influence of cable damper upon measuring accuracy of cable tension was proposed.The research results show that low modal frequencies of cable are changed obviously due to external dampers and the measurement precision of tension can be obtained with high modal frequencies.The results also show that the influence of damper on modal frequency increases with the increases of relative height of damper installment and damper coefficient,and the high modal frequencies of cable close to the frequencies when damper coefficient increases to infinity and location of damper is equivalent to fixed support.The proposed method was verified with stay cable No.A11 of Dongting Lake Bridge of Yueyang.It indicates that the method is reasonable and feasible.
引文
[1]REN W X,PENG X L.Baseline finite element modeling of alarge span cable-stayed bridge through field ambient vibrationtests[J].Computers&Structures,2005,83(8-9):536-550.
[2]贺修泽,伏晓宁.斜拉索的索力测试[J].中外公路,2002,22(6):38-39.HE Xiu-ze,FU Xiao-ning.The Cable Tension Measurement ofCable-Stayed Bridge[J].Journal of China&Foreign High-way,2002,22(6):38-39.
[3]陈常松,陈政清,颜东煌.柔索索力主频阶次误差及支承条件误差[J].交通运输工程学报,2004,4(4):17-20.CHEN Chang-song,CHEN Zheng-qing,YAN Dong-huang.Fr-equency Number Error and Support Condition of Flexible CableTension[J].Journal of Traffic and Transportation Engineering,2004,4(4):17-20.
[4]张宏跃,田石柱.提高斜拉索索力估算精度的方法[J].地震工程与工程振动,2004,24(4):82-85.ZHANG Hong-yue,TIAN Shi-zhu.A Method to Enhance Esti-mation Accuracy of Stay Cable Tension[J].Earthquake Engi-neering and Engineering Vibration,2004,24(4):82-85.
[5]林志宏,徐郁峰.频率法测量斜拉桥索力的关键技术[J].中外公路,2003,28(5):1-4.LIN Zhi-hong,XU Yu-feng.The Key Technology of MeasuringCable Tension of Cable-Stayed Bridge by Using FrequencyMethod[J].Journal of China&Foreign Highway,2003,28(5):1-4.
[6]胡利平,凌育洪.脉动法索力测量技术及相关参数分析[J].中南公路工程,2004,29(4):47-49.HU Li-ping,LING Yu-hong.Measurement Techniques of CableForce Using Microseism Method and Parameter Analyses[J].Central South Highway Engineering,2004,29(4):47-49.
[7]王朝华,李国蔚,何祖发,等.斜拉桥索力测量的影响因素分析[J].世界桥梁,2004(3):64-67.WANG Chao-hua,LI Guo-wei,HE Zu-fa,et al.Analysis ofInfluential Factors on Cable Force Measurement of Cable-StayedBridges[J].World Bridges,2004(3):64-67.
[8]王修勇,陈政清,倪一清,等.斜拉桥拉索磁流变阻尼器减振技术研究[J].中国公路学报,2003,16(2):52-56.WANG Xiu-yong,CHEN Zheng-qing,NI Yi-qing,et al.Studyof Mitigating Cables Vibration on The Cable-Stayed Bridges UsingMagnetorheological(MR)Dampers[J].China Journal of High-way and Transport,2003,16(2):52-56.
[9]ZHU Z H,MEGUID S A.Nonlinear FE-based Investigation ofFlexural Damping of Slacking Wire Cables[J].InternationalJournal of Solids and Structures,2007,44(16):5 122-5132.
[10]长沙理工大学.岳阳洞庭湖大桥斜拉桥营运阶段索力采集及其结果分析研究报告[R].湖南:长沙理工大学,2006.Changsha University of Science&Technology.The ResearchReport of Cable Tension Gathering and Its Results Analyzing ofYueyang Dongting Bridge in Working Period[R].Hunan:Changsha University of Science&Technology,2006.
[2]贺修泽,伏晓宁.斜拉索的索力测试[J].中外公路,2002,22(6):38-39.HE Xiu-ze,FU Xiao-ning.The Cable Tension Measurement ofCable-Stayed Bridge[J].Journal of China&Foreign High-way,2002,22(6):38-39.
[3]陈常松,陈政清,颜东煌.柔索索力主频阶次误差及支承条件误差[J].交通运输工程学报,2004,4(4):17-20.CHEN Chang-song,CHEN Zheng-qing,YAN Dong-huang.Fr-equency Number Error and Support Condition of Flexible CableTension[J].Journal of Traffic and Transportation Engineering,2004,4(4):17-20.
[4]张宏跃,田石柱.提高斜拉索索力估算精度的方法[J].地震工程与工程振动,2004,24(4):82-85.ZHANG Hong-yue,TIAN Shi-zhu.A Method to Enhance Esti-mation Accuracy of Stay Cable Tension[J].Earthquake Engi-neering and Engineering Vibration,2004,24(4):82-85.
[5]林志宏,徐郁峰.频率法测量斜拉桥索力的关键技术[J].中外公路,2003,28(5):1-4.LIN Zhi-hong,XU Yu-feng.The Key Technology of MeasuringCable Tension of Cable-Stayed Bridge by Using FrequencyMethod[J].Journal of China&Foreign Highway,2003,28(5):1-4.
[6]胡利平,凌育洪.脉动法索力测量技术及相关参数分析[J].中南公路工程,2004,29(4):47-49.HU Li-ping,LING Yu-hong.Measurement Techniques of CableForce Using Microseism Method and Parameter Analyses[J].Central South Highway Engineering,2004,29(4):47-49.
[7]王朝华,李国蔚,何祖发,等.斜拉桥索力测量的影响因素分析[J].世界桥梁,2004(3):64-67.WANG Chao-hua,LI Guo-wei,HE Zu-fa,et al.Analysis ofInfluential Factors on Cable Force Measurement of Cable-StayedBridges[J].World Bridges,2004(3):64-67.
[8]王修勇,陈政清,倪一清,等.斜拉桥拉索磁流变阻尼器减振技术研究[J].中国公路学报,2003,16(2):52-56.WANG Xiu-yong,CHEN Zheng-qing,NI Yi-qing,et al.Studyof Mitigating Cables Vibration on The Cable-Stayed Bridges UsingMagnetorheological(MR)Dampers[J].China Journal of High-way and Transport,2003,16(2):52-56.
[9]ZHU Z H,MEGUID S A.Nonlinear FE-based Investigation ofFlexural Damping of Slacking Wire Cables[J].InternationalJournal of Solids and Structures,2007,44(16):5 122-5132.
[10]长沙理工大学.岳阳洞庭湖大桥斜拉桥营运阶段索力采集及其结果分析研究报告[R].湖南:长沙理工大学,2006.Changsha University of Science&Technology.The ResearchReport of Cable Tension Gathering and Its Results Analyzing ofYueyang Dongting Bridge in Working Period[R].Hunan:Changsha University of Science&Technology,2006.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心