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

作　　者：刘发[1] 厉广广 杨洋 傅晨曦 韩天然 吴京[3] LIU Fa;LI Guang-guang;YANG Yang;FUChen-xi;HAN Tian-ran;WU Jing(Transportation Engineering Construction Bureauof Jiangsu,Nanjing21o004,China;China Design Group Co.Ltd.,Nanjing 210014,China;School of Civil Engineering,Southeast University,Nanjing 211189,China)

机构地区：[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

出　　处：《公路》2024年第9期117-123,共7页Highway

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。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 

分 类 号：U446.2[建筑科学—桥梁与隧道工程] U448.216[交通运输工程—道路与铁道工程]