基于长标距光纤光栅应变传感体系的拼宽桥梁动态变形现场测试
Field Test of Dynamic Deformation for Widened Bridge based on Long-gauge FBG Strain Sensing
刘发 1厉广广 1杨洋 1傅晨曦 2韩天然 3吴京3
作者信息
- 1. 江苏省交通工程建设局 南京市 210004
- 2. 华设设计集团 南京市 210014
- 3. 东南大学土木工程学院 南京市 211189
- 折叠
摘要
京沪高速改扩建工程中,为全面了解采用新型拼宽桥梁结构的高速公路改扩建桥梁的实际力学性能,全桥安装了长标距光纤光栅应变传感体系以实现对桥梁结构动态性能的高效评估.以一座三跨连续梁钢-混凝土组合梁拼宽混凝土旧桥为例,阐述了长标距光纤光栅应变传感技术在桥梁动态应变及挠度测试中的应用,先应用共轭梁理论研发了基于动应变的全桥分布式动挠度监测方法,然后开展实桥重车动载试验,使用这一方法考察该桥动力变形特征.本试验研究为观察新型拼宽桥的动态行为提供了试验方法,也为监测桥梁分布式长期动力变形提供了参考方案.
Abstract
To evaluate the structural behavior of a widening highway bridge jointed by RC bridge and steel bridge in the Beijing-Shanghai Expressway Expansion Project,a long-gauge FBG strain sensing system is installed to efficiently monitor and assess the dynamic structural performance of the bridges.In this paper,relying on a three-span continuous-beam steel-concrete composite girder widening bridge,the application of long-gauge FBG strain sensing technology in dynamic strain and deflection monitoring are introduced.Based on the dynamic strain input,a dynamic deflection monitoring method can be established through incorporating the conjugate beam theory;the dynamic deformation characteristics of the bridge are thereafter investigated as per the proposed method through field testing.This study provides experimental observations for the dynamic behavior of the new type widened bridge.Moreover,it also constructs an efficient monitoring solution for the long-term dynamic deformation behavior of bridges.
关键词
桥梁工程/拼宽桥梁结构/动力测试/光纤传感/长标距传感器/共轭梁Key words
bridge engineering/bridge widening/dynamic testing/fiber optic sensing/long-gauge sensor/conjugate beam引用本文复制引用
出版年
2024
NETL
NSTL
万方数据