基于FL型地基雷达干涉测量技术的桥梁变形监测研究
Study on Bridge Deformation Monitoring Based on FL Ground-based Radar Interferometry Technology
李培庆 1张国建 2刘胜震 3臧耿晨 2张思峰 4包立新1
作者信息
- 1. 山东省路桥集团有限公司,山东 济南 250014
- 2. 山东建筑大学测绘地理信息学院,山东 济南 250101
- 3. 自然资源部第一大地测量队,陕西 西安 710054
- 4. 山东建筑大学交通工程学院,山东 济南 250101
- 折叠
摘要
地基雷达干涉测量技术可以在非接触状态下监测特大尺寸线状建(构)筑物的整体运营状态,且测量精度达到亚毫米级,是桥梁健康监测的重要手段.文中采用该技术FL模式监测特大跨径桥梁,获取全天候24h桥梁形变演化数据,研究外界因素变化对桥梁变形规律的影响.结果表明,在自然环境中,桥梁变形与温度、气压呈负相关,与风速呈正相关,温度变化约1℃发生最大变形为11.44 mm.试验数据表明,自然状态下,变形最大值发生在边跨,而不是发生在跨中,是理论设计与复杂环境共同作用的结果.实测数据显示,地基雷达干涉测量系统可快速检测桥梁结构弯曲模态,尤其适合于大跨度桥梁体系在灾害后的紧急状态监测.
Abstract
Ground-based radar interferometry technology can monitor the overall operation status of extra-large linear buildings(structures)in a non-contact state,and the measurement accuracy can reach sub-millimeter level,which can be used as an important means of bridge health monitoring.Therefore,in this paper,the FL mode of this technology is used to monitor extra-large span bridges,obtain 24-hour bridge de-formation evolution data,and study the influence of external factors on bridge deformation law.The results show that the deformation of the bridge in the natural environment is negatively correlated with temperature and air pressure,and positively correlated with wind speed,and the data show that the maximum deformation of 11.44 mm occurs when the temperature changes about1℃.In addition,the data on the day of the experiment showed that the maximum deformation in the natural state occurred in the edge span,not in the middle of the span.This phenome-non is the result of the interaction of theoretical design and complex environment.The measured data shows that the ground-based radar inter-ferometry system can quickly detect the bending mode of bridge structure,which is especially suitable for emergency monitoring of long-span bridge system after disaster.
关键词
地基雷达干涉测量/变形监测/特大跨径桥梁Key words
Ground-based radar interferometry/Deflection deformation/Extra-long span bridge引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据