基于激光-位置传感器的简支梁桥挠度测量方法研究
STUDY ON DEFLECTION MEASUREMENT OF SIMPLY SUPPORTED GIRDER BRIDGES BASED ON LASER-POSITION SENSITIVE DETECTORS
熊琛 1岑成昱 1周海俊 1宋神友 2金文良 2慕容锋 1梁燕媚1
作者信息
- 1. 深圳大学土木与交通工程学院,深圳 518060
- 2. 深中通道管理中心,广东,中山 528400
- 折叠
摘要
挠度变形监测是桥梁健康监测的重要组成部分,该文提出了一种基于激光-位置传感器(position sensitive detectors,PSD)的简支梁桥高精度挠度测量系统.该系统采用激光反射偏转位移放大简支梁桥挠度,实现微米级精度的桥梁挠度静、动态监测.介绍了该系统的组成及工作原理,通过激光反射偏转原理可以将桥梁跨中挠度放大 7倍以上,实现高精度挠度测量;通过理论推导与误差分析,讨论了激光发射接收器与反射器放置位置对挠度放大倍率的影响;通过试验验证了该体系的测量效果.该体系可在毫米级量程内,准确测量高于1µm的简支梁桥跨中挠度,并且可以对挠度进行动态测量,识别桥梁的自振周期等动力参数.该文提出的激光-PSD测量体系具有精度高、响应速度快、价格低、易于开展长期动态监测的特点.以期为中小跨径简支梁桥的挠度健康监测提供参考.
Abstract
Deflection monitoring is an important part of bridge health monitoring.A high-precision deflection measurement system based on laser-PSD(Position Sensitive Detectors)for simply supported girder bridges is proposed.The system adopts a laser reflection method to amplify the deflection of simply supported girder bridges and realize static and dynamic monitoring of bridge deflection with micrometer-level accuracy.The composition and working principle of the system are firstly introduced,which can amplify the bridge mid-span deflection by more than 7 times through the laser reflection principle to achieve high-precision deflection measurement;Through theoretical derivation and error analysis,the influence of the placement of the laser transceiver and reflector on the deflection amplification factor is discussed;The effectiveness of the system is verified through experiments.The system can accurately measure the mid-span deflection of a simply supported girder bridge with an accuracy above 1µm for the measurement range of millimeter level.It can perform dynamic deflection measurements so as to identify dynamic parameters such as the fundamental periods of the bridges.The laser-PSD measurement system proposed in this paper features high accuracy,fast response,low price,and easy-to-implement for long-term dynamic monitoring.This study is expected to provide a reference for deflection health monitoring of small and medium span simply supported girder bridges.
关键词
挠度监测/简支梁桥/桥梁挠度/动态监测/激光-PSDKey words
deflection monitoring/simply supported girder bridges/bridge deflection/dynamic monitoring/laser-position sensitive detectors引用本文复制引用
出版年
2025
NETL
NSTL
万方数据