Research on Micro-damage Identification of Beam Structure Based on
Distributed Macro-strain Measurement

doi:10.3969/j.issn.1674-0696.2018.11.03

Journal of Chongqing Jiaotong University(Natural Science) ›› 2018, Vol. 37 ›› Issue (11): 15-20.DOI: 10.3969/j.issn.1674-0696.2018.11.03

• Bridge & Tunnel Engineering • Previous Articles Next Articles

Research on Micro-damage Identification of Beam Structure Based on Distributed Macro-strain Measurement

ZHANG Hao1 , HAN Naijie2, LIU Kai2, ZHONG Zhixin2

(1. Structural Health Monitor and Control Institute, Shijiazhuang Tiedao University, Shijiazhuang 050043, Hebei, P. R. China; 2. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, Hebei, P. R.China)

Received:2017-08-12 Revised:2017-12-20 Online:2018-11-19 Published:2018-11-19

基于宏观应变测试的受弯构件微损伤识别研究

张浩1，韩乃杰2，刘凯2，钟志鑫2

(1.石家庄铁道大学大型结构健康诊断与控制研究所，河北石家庄 050043；2.石家庄铁道大学土木工程学院，河北石家庄 050043)

作者简介:张浩(1976—)，男，副教授，博士，主要从事桥梁健康监测系统开发方面的研究。E-mail: sjzrizh@hotmail.com。通信作者：韩乃杰(1988—)，男，博士生，主要从事桥梁结构健康监测方面的研究。E-mail :hannaijie@qq.com。
基金资助:
河北省教育厅重点项目（ZD2015060）

Abstract

Abstract: Based on the theory of macro-strain, multiple parameters, included damage range, stiffness reduction, damage location were analyzed. Damage indexs for beam minute damage condition were improved and veritied by indoor test. Besides, after the improvement, damage error was controlled within 2%. The research shows that the amount of stiffness reduction measured by the improved damage index is independent of damage location.When damage range and location are certain, accurate stiffness reduction of minute damage in gauge length can be achieved by fitting formula.In this way, minute damage can be identified accurately.

Key words: bridge engineering, fiber grating, distributed measurement, macro-strain, damage identification, damage quantification

摘要： 基于宏观应变理论，针对受弯构件微损伤工况，对损伤范围、刚度折减量、损伤位置进行分析，总结了不同参数对识别结果的影响，根据结论改进了原有的损伤指标，并进行了室内实验验证，由改进后的损伤指标计算的损伤误差在2%以内。研究表明：由改进后的损伤指标计算的刚度折减量与损伤位置无关；当确定了损伤范围和损伤位置，通过拟合的计算公式能够准确量化标距范围内的刚度折减量，实现了标距范围内更细微损伤的精确定量识别。

关键词: 桥梁工程, 光纤光栅, 分布式测量, 宏观应变, 损伤识别, 损伤定量

CLC Number:

U445.7
TU312

ZHANG Hao1 , HAN Naijie2, LIU Kai2, ZHONG Zhixin2. Research on Micro-damage Identification of Beam Structure Based on Distributed Macro-strain Measurement[J]. Journal of Chongqing Jiaotong University(Natural Science), 2018, 37(11): 15-20.

张浩1，韩乃杰2，刘凯2，钟志鑫2. 基于宏观应变测试的受弯构件微损伤识别研究[J]. 重庆交通大学学报（自然科学版）, 2018, 37(11): 15-20.

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Research on Micro-damage Identification of Beam Structure Based on Distributed Macro-strain Measurement

基于宏观应变测试的受弯构件微损伤识别研究

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