摘要
对常德市沅水四桥主桥采用无线传感器进行动测点布设,进行了现场动力特性试验(包含脉动试验、跑车试验、刹车试验),其中脉动试验依据荷载试验相关规范要求,采集了主桥共九阶模态频率及其相应的振型,通过跑车和刹车试验获取了本桥不同工况下的冲击系数,结合大型有限元计算软件midas模型分析结果,对沅水四桥进行了动力特性分析,将计算结果和试验结果进行了比较,发现包括横向及竖向振型的九阶模态结果基本吻合,试验冲击系数均小于理论值,表明了准确的有限元计算模型结合现场动力试验,可有效评价桥梁的动力特性。
The field dynamic characteristics test(including pulsation test,racing car test and brake test)was carried out on the main bridge of yuanshui bridge in changde city,using wireless sensor to enter the mobile measuring point.According to the relevant specifications of load test,the nine-order modal frequencies and corresponding modes of the main bridge are collected in the pulsation test.The impact coefficients of the bridge under different working conditions are obtained through the running and braking tests.Based on the results of MIDAS model analysis,the dynamic characteristics of Yuanshui Fourth Bridge are analyzed.Comparing the calculated results with the experimental results,it is found that the results of the ninth order modes,including the transverse and vertical modes,are basically consistent,and the impact coefficients of the test are less than the theoretical values.It shows that the accurate finite element calculation model combined with field dynamic test can effectively evaluate the dynamic characteristics of bridges.
作者
唐艳
TANG Yan(Hunan Lianzhi Bridge & Tunnel Technlogy Co.,Ltd.,Changsha,Hunan 410200,China)
出处
《公路工程》
北大核心
2019年第4期245-249,共5页
Highway Engineering
关键词
脉动试验
模态频率
冲击系数
有限元分析
Pulsation test
Modal frequency
Impact coefficient
finite element analysis
