1.山东铁路投资控股集团有限公司高速铁路工程技术研发中心,山东 济南 250102
2.山东轨道交通研究院有限公司,山东 济南 250014
3.济南轨道交通集团有限公司,山东 济南 250014
4.济南黄河路桥建设集团有限公司,山东 济南 250014
曹建新(1994—),男,高级工程师,博士。主要从事结构健康监测研究。E‑mail:cjxxqy2016@163.com
收稿:2023-11-01,
修回:2024-03-05,
纸质出版:2025-06-28
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曹建新,王永亮,杜继新等.基于分布式应变数据融合的桥群结构损伤定位方法[J].防灾减灾工程学报,2025,45(03):664-671.
CAO Jianxin,WANG Yongliang,DU Jixin,et al.Damage Localization Method for Bridge Group Structures Based on Distributed Strain Data Fusion[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(03):664-671.
曹建新,王永亮,杜继新等.基于分布式应变数据融合的桥群结构损伤定位方法[J].防灾减灾工程学报,2025,45(03):664-671. DOI: 10.13409/j.cnki.jdpme.20231101002.
CAO Jianxin,WANG Yongliang,DU Jixin,et al.Damage Localization Method for Bridge Group Structures Based on Distributed Strain Data Fusion[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(03):664-671. DOI: 10.13409/j.cnki.jdpme.20231101002.
既有中小跨径桥群结构健康监测系统广泛存在健康状态数据缺乏、数据受耦合作用影响、测点密度不足等问题,难以对桥群结构的长期运营安全进行精准诊断及评估。针对集群化监测桥梁的结构损伤定位难题,提出了基于分布式应变数据融合的桥群结构损伤定位方法。首先,考虑车体重量、车辆行驶横向位置的不同,理论推导移动荷载作用下简支梁桥的应变时程曲线最大值方程;其次,通过分析桥群内不同桥梁各监测分位点处应变时程曲线最大值的构成特征,构建了基于多桥分布式应变监测数据融合的结构损伤定位指标;最后,提出桥群结构分布式测点损伤定位指标的归一化方法,探讨了归一化损伤定位指标与主梁结构损伤的关系,实现桥群内全部桥梁结构的损伤定位。与传统方法不同,所提方法利用连续的桥群结构承受车辆荷载基本一致的特点,通过融合多座桥梁的监测数据,挖掘出桥梁之间应变监测数据存在的耦联关系,有效提高了桥梁结构损伤定位的精度。结果表明:该方法可以实现在桥梁结构单元3%的刚度衰减和15%测试噪声影响下的损伤定位,特别适用于长距离实际桥群工程的结构损伤快速定位。
Existing structural health monitoring systems for small- and medium-span bridge groups often suffer from issues such as insufficient health status data
data coupling effects
and low sensor density
making it challenging to accurately diagnose and assess the long-term operational safety of bridge groups. To address the challenge of structural damage localization in cluster-monitored bridge groups
this paper proposed a method based on distributed strain data fusion. Firstly
considering the variations in vehicle weight and lateral position of vehicle travel
a theoretical equation was derived for the maximum value of the strain time-history curve of a simply supported beam bridge under moving loads. Secondly
by analyzing the compositional characteristics of the maximum values in the strain time-history curves at different monitoring positions across various bridges
a structural damage localization index was constructed based on the fusion of distributed strain monitoring data from multiple bridges. Finally
a normalization method for distributed damage localization indices was proposed
and the relationship between the normalized indices and structural damage of the main girder was explored
enabling damage localization across all bridges in the group. Unlike traditional methods
the proposed approach leverages the consistent vehicle load conditions experienced by continuously arranged bridge structures and utilizes the coupling relationships within the strain monitoring data across bridges to significantly improve the accuracy of structural damage localization. The results show that this method can localize damage under a 3% stiffness reduction of structural components and 15% measurement noise
and is particularly effective for rapid damage localization in long-distance
practical bridge group projects.
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