基于柔度矩阵对角矩阵变化率的桥梁支座脱离识别:室内物理模拟实验

IF 5.7 2区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY
Shiji Ma, Lan Qiao, Qingwen Li
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引用次数: 0

摘要

桥梁支座脱离是桥梁领域中普遍存在的问题,它可能导致运营环境的变化,寿命的缩短,以及交通安全的降低。目前用于检测这种断开的方法主要依靠力传感器、摄像头和加速度传感器。然而,它们在现场的实际执行和在准确识别脱离接触方面的有效性需要加强。为了解决与传统接触式传感器的安装和布局相关的挑战,以及可能引入的额外质量,设计了一种复杂的“桥轴承断开检测系统”。这一创新系统基于激光多普勒测振仪技术,消除了物理接触的需要。在本研究的框架内,成功验证了采用非接触式激光多普勒振动测量技术检测桥梁-轴承断裂的可行性。此外,还对关键动力参数(特别是固有频率和振动模态)对桥梁支座脱离的敏感性进行了全面分析。验证过程包括在模拟完全断开的不同工况下,评估振动模态绝对变化和柔度矩阵对角矩阵变化率(FDMCR)的正则化组合识别有效性。这项评估包括使用有限元分析和实证测量。研究结果明确表明,桥梁轴承的断开导致每个模态阶的固有频率降低,并具有观察到的累积效应。此外,值得注意的是,振动模态指标通常对外轴承的断开表现出更大的敏感性。相比之下,FDMCR在识别桥梁轴承脱离方面表现出值得称赞的定位能力和卓越的抗噪声能力。从这些研究结果中收集到的经验见解在桥梁支座脱离的现场识别方面具有重要价值,最终有助于维护桥梁的长期运行完整性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Bridge-bearing disengagement identification based on flexibility matrix diagonal matrix change rate: an indoor physical simulation experiment
The disengagement of bridge bearings is a pervasive issue encountered in the realm of bridges, which can potentially lead to changes in operational circumstances, diminished longevity, and compromised traffic safety. The current methods employed for detecting such disconnections primarily rely on force sensors, cameras, and acceleration sensors. However, their practical implementation on-site and effectiveness in accurately identifying disengagement require enhancement. To address the challenges associated with the installation and layout of conventional contact sensors, as well as the potential introduction of additional mass, a sophisticated “bridge-bearing disconnection detection system” has been devised. This innovative system is based on laser Doppler vibrometer technology, which eliminates the need for physical contact. The feasibility of employing non-contact laser Doppler vibration measurement technology in the detection of bridge-bearing disconnection has been successfully verified within the framework of this study. Furthermore, a comprehensive analysis of the sensitivity of key dynamic parameters, specifically natural frequencies and vibration modes, to bridge-bearing disengagement has been conducted. The verification process included evaluating the identification effectiveness of regularized combined absolute changes in vibration modes and flexibility matrix diagonal matrix change rate (FDMCR) under diverse working conditions simulating complete disconnection. This assessment involved using both finite element analysis and empirical measurements. The findings unequivocally demonstrate that the disconnection of bridge bearings results in a reduction in the natural frequencies for each mode order, with an observed cumulative effect. In addition, it is noteworthy that the vibration mode indices typically exhibit greater sensitivity toward the disconnection of outer bearings. By contrast, FDMCR demonstrates commendable positioning capabilities and exceptional noise resistance in identifying bridge-bearing disengagement. The empirical insights gleaned from these research findings hold significant value in terms of on-site identification of bridge-bearing disengagement, ultimately contributing to the preservation of bridges’ long-term operational integrity.
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来源期刊
CiteScore
12.80
自引率
12.10%
发文量
181
审稿时长
4.8 months
期刊介绍: Structural Health Monitoring is an international peer reviewed journal that publishes the highest quality original research that contain theoretical, analytical, and experimental investigations that advance the body of knowledge and its application in the discipline of structural health monitoring.
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