高桩码头基桩损伤的光纤光栅传感阵列识别  

Identification of pile damage in high pile wharf by fiber Bragg grating sensor array

作　　者：舒岳阶[1,3] 吴俊 周世良[1,2] 王俊杰[2] SHU Yue-jie;WU Jun;ZHOU Shi-liang;WANG Jun-jie(The Southwestern Research Waterway Engineering Institute,Chongqing Jiaotong University,Chongqing 400016,China;Key Laboratory of Inland Waterway Regulation Engineering Ministry of Transport,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Xike Waterway Engineering Consulting Center,Chongqing 400016,China)

机构地区：[1]重庆交通大学西南水运工程科学研究所,重庆400016 [2]重庆交通大学内河航道整治技术交通行业重点实验室,重庆400074 [3]重庆西科水运工程咨询中心,重庆400016

出　　处：《光学精密工程》2021年第10期2349-2362,共14页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.51508059);重庆市基础研究与前沿探索项目(No.cstc2018jcyjAX0345);重庆市教育委员会科学技术研究项目(No.KJQN201800739)。

摘　　要：为了实现高桩码头基桩损伤的检测,对基桩挠度测量方法、静态损伤特征及损伤识别方法等进行了研究。基于应变与曲率、曲率与挠度的关系,采用两列对称布置的光纤光栅应变传感器阵列,实现了高桩码头基桩损伤前后挠度的测量;推导了多损伤条件下的基桩挠度函数,分析了基桩损伤的静态特征,确定了损伤识别指标;提出了高桩码头基桩分段损伤识别方法,并通过数值仿真与物理模型实验进行了验证。数值计算结果表明,计算损伤与预设损伤的位置基本一致,损伤程度的测量误差最大为3.3%。物理模型实验表明,预设损伤位于实测损伤范围之内,且基桩截面损伤系数与实测损伤程度呈线性关系,线性度为0.8875,即光纤光栅传感器阵列能有效识别损伤。本方法对于损伤前后基桩均适用,且具有物理意义明确,不依赖优化算法,可长期监测等优点,满足高桩码头基桩损伤的监测需求。To detect the damage of a high-piled wharf,the deflection measurement method,static damage characteristics,and damage identification method were studied.First,the deflection of the high-piled wharf was measured using two symmetrically arranged fiber Bragg grating strain sensor arrays,according to the relationship between strain and curvature and curvature and deflection.Then,the deflection function of the pile under multiple damage conditions was derived,the static characteristics after damage were analyzed,and the damage identification index was determined.Finally,a method for the segmented damage identification of the pile was proposed,and verified by numerical simulation and a physical model experiment.Numerical calculation results show that the calculated damage is essentially the same as the preset damage location,with a maximum damage measurement error of 3.3%.The physical model experiment shows that the preset damage is within the measured damage range,the pile section damage coefficient is consistent with the measured damage degree,and the linearity is 0.8875,thus indicating that the fiber Bragg grating sensor array can effectively identify the damage.This method is suitable for piles before and after damage and has the advantages of providing a clear physical meaning,with no optimization algorithm and long-term monitoring,etc.,thus meeting the needs of pile-damage monitoring for highpiled wharfs.

关 键 词：光纤传感 高桩码头 基桩 损伤识别 光纤光栅 挠度变化 

分 类 号：TN253[电子电信—物理电子学]