Damage alarming of long-span suspension bridge based on GPS-RTK monitoring
来源期刊：中南大学学报(英文版)2015年第7期
论文作者：MIAO Chang-qing(缪长青) WANG Man(王蔓) TIAN Hong-jin(田洪金) FENG Zhao-xiang(冯兆祥) CHEN Ce(陈策)
文章页码：2800 - 2808
Key words：long-span suspension bridge; damage alarming; mean-value control chart; GPS displacement; temperature correlation
Abstract: Structure damage identification and alarming of long-span bridge were conducted with three-dimensional dynamic displacement data collected by GPS subsystem of health monitoring system on Runyang Suspension Bridge. First, the effects of temperature on the main girder spatial position coordinates were analyzed from the transverse, longitudinal and vertical directions of bridge, and the correlation regression models were built between temperature and the position coordinates of main girder in the longitudinal and vertical directions; then the alarming indices of coordinate residuals were conducted, and the mean-value control chart was applied to making statistical pattern identification for abnormal changes of girder dynamic coordinates; and finally, the structural damage alarming method of main girder was established. Analysis results show that temperature has remarkable correlation with position coordinates in the longitudinal and vertical directions of bridge, and has weak correlation with the transverse coordinates. The 3% abnormal change of the longitudinal coordinates and 5% abnormal change of the vertical ones caused by structural damage are respectively identified by the mean-value control chart method based on GPS dynamic monitoring data and hence the structural abnormalities state identification and damage alarming for main girder of long-span suspension bridge can be realized in multiple directions.
MIAO Chang-qing(缪长青)1, 2, WANG Man(王蔓)1, TIAN Hong-jin(田洪金)1, FENG Zhao-xiang(冯兆祥)3, CHEN Ce(陈策)4
(1. School of Civil Engineering, Southeast University, Nanjing 210096, China;
2. Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education,
(Southeast University), Nanjing 210096, China;
3. Jiangsu provincial Transportation Engineering Construction Bureau, Nanjing 210004, China
4. Jiangsu Taizhou Bridge Ltd. Co., Taizhou 225321, China)
Abstract:Structure damage identification and alarming of long-span bridge were conducted with three-dimensional dynamic displacement data collected by GPS subsystem of health monitoring system on Runyang Suspension Bridge. First, the effects of temperature on the main girder spatial position coordinates were analyzed from the transverse, longitudinal and vertical directions of bridge, and the correlation regression models were built between temperature and the position coordinates of main girder in the longitudinal and vertical directions; then the alarming indices of coordinate residuals were conducted, and the mean-value control chart was applied to making statistical pattern identification for abnormal changes of girder dynamic coordinates; and finally, the structural damage alarming method of main girder was established. Analysis results show that temperature has remarkable correlation with position coordinates in the longitudinal and vertical directions of bridge, and has weak correlation with the transverse coordinates. The 3% abnormal change of the longitudinal coordinates and 5% abnormal change of the vertical ones caused by structural damage are respectively identified by the mean-value control chart method based on GPS dynamic monitoring data and hence the structural abnormalities state identification and damage alarming for main girder of long-span suspension bridge can be realized in multiple directions.
Key words:long-span suspension bridge; damage alarming; mean-value control chart; GPS displacement; temperature correlation
