桥塔涡激共振可靠性简化计算方法

英文篇名：Simplified calculation method for reliability analysis of vortex excited vibration of bridge tower
中文刊名：地震工程与工程振动
英文刊名：Journal of Earthquake Engineering and Engineering Vibration
作者：周宝勇 ; 余建星 ; 郭君 ; 周清基
英文作者：ZHOU Baoyong1 ; YU Jianxing1 ; GUO Jun2 ; ZHOU Qingji1(1.Key Lab of Port and Ocean Engineering ; Ministry of Education ; Tianjin University ; Tianjin 300072 ; China ; 2.The 705 Research Institute of CSIC ; Xi′an 710075 ; China)
中文关键词：桥塔 ; 涡激共振 ; 频率锁定 ; 可靠性 ; AFOSM
英文关键词：bridge tower ; vortex inspiriting vibration ; frequency locking ; reliability analysis ; AFOSM
出版日期：2011-08-15
机构：天津大学港口与海洋工程教育部天津市重点实验室;中国船舶重工集团第七零五研究所;
年：2011
期：04
出版单位：地震工程与工程振动

摘要

针对桥塔在风载荷下的涡激共振可靠性问题,在涡激振动机理与频率锁定现象研究基础上,提出一种计算桥塔涡激振动可靠性的简化方法。将临界风速结合Re数和Strouhal数建立涡激共振下桥塔安全裕度方程,并引入AFOSM求解方法解决非线性问题,利用MATLAB进行可靠性求解程序编制,在保证计算精度的同时大大降低了桥塔涡激振动可靠性的计算难度,节省计算时间。最后以天津海河吉兆桥为例,说明提出的简化方法是可行和可靠的。
To evaluate the reliability of bridge tower vortex excited vibration induced by wind,a simplified calculation method is proposed on the basis of the research on vortex induced vibration mechanism and the phenomenon of frequency locking.The safety margin equation is derived by critical wind speed with Re number and Strouhal number.A non-linear solving program for reliability analysis based on AFOSM theory and MATLAB is programmed.By using the reduction method of this paper,with satisfactory calculation accuracy,the calculation difficulty of reliability analysis for bridge tower vortex excited vibration is overcome.Its calculation time is saving.This calculation method has been used in the Haihe Jizhao Bridge project.The results show that this simple calculation method is reliable.

引文

[1]Guo Tong,Li Aiqun,Miao Changqing.Monte carlo numerical simulation and its application in probability analysis of long span bridges[J].Jour-nal of Southeast University,2005,21(4):469-473.
    [2]余建星,何斌,杨钢.大型斜拉桥风致振动可靠性分析方法[J].地震工程与工程振动,2003,23(1):50-53.
    [3]卢伟,强士中,李晓渝.斜拉桥抖振动力可靠性分析[J].振动与冲击,2001,20(2):82-85.
    [4]余建星,杨晓蓉,韩天石,等.大型斜拉桥圆柱形桥塔涡激共振的控制[J].公路交通科技,2008,25(11):66-71.
    [5]王中文,朱宏平,廖海黎,等.钢桥塔裸塔状态涡激振动的TLD减振方法研究[J].华中科技大学学报:城市科学版,2009,26(2):9-15.
    [6]杨晓蓉,蔺金太,周玉鑫,等.大型斜拉桥圆柱型桥塔的涡激共振研究[J].军事交通学院学报,2008,10(5):86-90.
    [7]杨晓蓉,王新歧.大型斜拉桥圆柱型桥塔的动力特性研究[J].西安建筑科技大学学报:自然科学版,2008,40(2):231-237.
    [8]余建星,郭振邦,徐慧,等.船舶与海洋结构物可靠性原理[M].天津:天津大学出版社,2001.