基于FBG宏应变技术的桥梁挠度监测方法及试验研究

发布时间：2018-07-08 09:36

本文选题：挠度 + 光纤布拉格光栅　；参考：《苏州科技大学》2017年硕士论文

【摘要】：中国是桥梁大国。自古以来,桥梁就是交通线路的重要组成部分,并与人们的生产生活息息相关。桥梁从施工至运营过程中始终受到自然环境和交通荷载等作用。这些因素会对桥梁造成一定的损伤,直接影响其适用性与耐久性。严重的还会造成桥梁主体结构的破坏,对人们生产生活造成严重的影响。因此,对桥梁灾害进行正确的认识和分析,并提出合理有效的解决方案有着重要的经济价值和社会效益。目前传统的一些桥梁健康监测都有一定的弊端,经专家学者们的大力研究与探索,光纤布拉格光栅传感器出现在桥梁健康监测领域中,一经发现,它就以轻质柔软、精度高、稳定性好,抗电磁干扰,抗飘零等优越性能为广大专家们所接受。本文将传统的点式光纤布拉格光栅传感器发展成光纤布拉格光栅宏应变传感器,经试验证明,光纤布拉格光栅宏应变传感在实际中能准确测量出桥梁结构的结构反应。基于此,本文对光纤布拉格光栅宏应变传感做了如下研究:(1)阐述了本文课题的背景及其意义,以及光纤布拉格光栅宏应变传感目前在国内外的发展和一些国内外的工程实例;(2)介绍了光纤布拉格光栅(FBG)宏应变传感器的健康监测框架系统设计,从桥梁的分类,到监测系统的分类,再到监测内容的分类与其运用的公式及原理。(3)针对光纤布拉格光栅传感器的基本原理,对FBG宏应变传感器的结构监测做了详细研究。(4)针对一座典型的梁式桥,取其中混凝土T型简支梁做监测试验。通过对梁进行8个单元划分,用平行拓扑的分布方式在各单元布设传感器。在对桥梁的曲率进行测量的基础上,再进行桥梁的挠度测量。(5)做了混凝土T型简支梁的模拟,依据经验与实际情况,将标距分别定为0.1米,0.2米与0.3米。再将测得的挠度与LVDT测得的挠度做了对比分析。
[Abstract]:China is a big bridge country. Since ancient times, bridge is an important part of traffic line, and is closely related to people's production and life. The bridge is always affected by natural environment and traffic load from construction to operation. These factors will cause certain damage to the bridge and directly affect its applicability and durability. Serious damage to the main structure of the bridge will cause serious impact on people's production and life. Therefore, it has important economic value and social benefit to correctly understand and analyze bridge disasters and put forward reasonable and effective solutions. At present, some traditional bridge health monitoring has some drawbacks. Through the great research and exploration of experts and scholars, fiber Bragg grating sensor appears in the field of bridge health monitoring. Once found, it is light and soft, with high precision. Good stability, anti-electromagnetic interference, anti-floating and other superior performance for the majority of experts accepted. In this paper, the traditional point fiber Bragg grating sensor is developed into a fiber Bragg grating macro strain sensor. The experimental results show that the fiber Bragg grating macro strain sensor can accurately measure the structural response of the bridge structure in practice. Based on this, the following researches have been done on the fiber Bragg grating macro strain sensing: (1) the background and significance of this thesis are described. The development of fiber Bragg grating (FBG) macro strain sensor at home and abroad and some engineering examples at home and abroad are also given. (2) the design of FBG macro strain sensor health monitoring system is introduced. To the classification of the monitoring system, then to the classification of the monitoring content and its application formula and principle. (3) aiming at the basic principle of fiber Bragg grating sensor, The structure monitoring of FBG macro strain sensor is studied in detail. (4) for a typical beam bridge, the concrete T-type simply supported beam is selected for monitoring test. By dividing the beam into eight elements, the sensors are arranged in each unit in parallel topology. On the basis of measuring the curvature of the bridge, the deflection of the bridge is measured. (5) the simulation of the concrete T-type simply supported beam is done. According to the experience and the actual situation, the distance is determined to be 0.1m 0.2m and 0.3m respectively. The deflection measured by LVDT is compared with that measured by LVDT.
【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U446

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