湖南大学学报（自然科学版）2016，Vol.43Issue(9)：98-104,7.
大跨度钢斜拉桥主梁监测挠度的评估与预警
Assessment and Early Warning on the Monitoring Girder Deflection of the Long-Span Steel Cable-Stayed Bridge
摘要
Abstract
Based on long-term monitoring data in Nanj ing No.3 Yangtze River Bridge,a long-term trend assessment and dynamic early warning method on the girder deflection of the steel cable-stayed bridge with statistical theory was proposed.First of all,the variation characteristics of the deflection with temperature were analyzed.The data of 0:00-1:00 at night was selected.The influence of vehicle load was removed,but the integral temperature effect was considered.The reference value of the deflection due to dead load was obtained.Secondly,the assessment was implemented by the linear moderate model and grey correlation analysis according to actual fact.Taking the data from 2007 to 2010 as an example,the results show that the established methods are consistent with long-term trend and helpful for the further inspec-tion of bridge defects.Finally,two-stage (yellow and red)early warning line was set up based on a certain guarantee rate.Considering the influence of traffic volume variance and cumulative damage,the dynamic warning line was established.Two samples of period before and after the snowstorm in 2008 and traffic volume growth were taken for verification.The results show that the proposed dynamic warning line not only can be effectively applied to the daily operation or emergency situation,but also achieve synchronous update according to the actual condition of the bridge.关键词
钢斜拉桥/挠度/统计理论/评估/预警Key words
cable-stayed bridge/deflection/statistical theory/assessment/early warning分类
交通工程引用本文复制引用
刘小玲,黄侨,任远,樊叶华..大跨度钢斜拉桥主梁监测挠度的评估与预警[J].湖南大学学报（自然科学版）,2016,43(9):98-104,7.基金项目
国家自然科学基金资助项目（51208096），National Natural Science Foundation of China（51208096）；江苏省交通厅重大科技专项资助项目 （）
