基于FBG宏应变空间拓扑阵列的组合梁桥整体性态演化与监测研究

项目名称： 基于FBG宏应变空间拓扑阵列的组合梁桥整体性态演化与监测研究

项目编号： No.51308369

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 王大鹏

作者单位： 苏州科技学院

项目金额： 25万元

中文摘要： FBG(Fiber Bragg Grating)传感技术是结构健康监测首选智能传感手段。传统FBG传感器无法实现海量分布、分布位置依靠预测且对未覆盖区域无法感应，因此整体监测结果可能失真。FBG宏应变传感技术通过分布式光栅扩展测量范围，可用少量传感器形成空间分布阵列覆盖结构整体，获得足量特征信息，监测桥梁真实性态。但宏应变测量范围较大，内部可能存在非线性，其传感特性及机理的研究尚不明确，如何应用宏应变空间阵列数据分析结构整体性态尚缺乏深入研究。 本项目拟建立宏应变测量的应变传递模型以及修正方法，揭示宏应变传感特性与机理；建立不同形式空间分布传感阵列，进行组合梁桥大比例模型试验，研究传感阵列的空间拓扑方法；基于监测数据，研究宏应变数据有效特征信息的提取和分析方法，实现模型重构，演化组合梁桥的整体性态；建立基于宏应变模态的结构性态参数监测方法。为宏应变传感技术在桥梁健康监测的应用提供科学依据。

中文关键词： 光纤布拉格光栅；宏应变传感特性；空间拓扑；整体性态监测；

英文摘要： The FBG (Fiber Bragg Grating) sensing technology has become the first choice of smart sensing approach for structure health monitoring. Some distortion may occurs in the results of the global monitoring by the traditional FBG because of the infeasible in mass distribution, distributed location dependent on the prediction, no sensing on the information in the uncovered region. The macro-strain sensing technology of FBG enables to obtain enough characteristic information and monitor the ture performance of bridge structure with the potential advantages of the sensing range amplified by distributed grating and the spatial array to cover the whole structure by a small mount of sensors. There is uncertain in the sensing characteristic and mechanism of macro-strain on account of the possible non linear behavior resulted from the larger sensing region. It is still lack of further study on how to analyze the performace of whole structure by the data from spatial array of macro-strain measurement. In this project, in order to reveal the sensing characteristic and mechanism, the strain transfer models and correction methods will be put forward. The spatial topology method of macro-strain sensing array will be studied by comparing different type of sensing arrays and the test of the large-scale composite girder bridge. Ba

英文关键词： Fiber Bragg Grating；macro-strain sensing characteristic；spatial topology；global performance monitoring；