基于CFRP力阻效应的结构状态监测系统

发布时间：2019-07-06 11:01

【摘要】：随着结构健康监测(SHM)领域的不断发展,智能材料逐渐成为研究的热点,尤其是对于承重材料自身感知性能方面的研究,越来越受到土木工程学者的青睐。在承载材料的智能特性研究方面,碳纤维材料表现出了卓越的承载-智能二重性:首先,在承载特性方面,碳纤维材料轻质、高强,具有传统钢筋等材料所不具备的较强的耐腐蚀性和耐久性,其多变的材料形式(丝、筋材、板材、面材)也是其能获得广泛应用的重要基础;其次,在智能特性方面,碳纤维材料具有类似应变片一样的力阻特性,即其自身的电阻值随荷载具有较为明显的变化,因此具备了成为集承载和监测功能于一体的新型智能结构材料。本文在国家自然科学基金“基于碳纤维材料的预应力混凝土结构自感知特性及其应用研究(51478209)”的资助下,主要在课题组前期研究的基础上,对基于碳纤维的CFRP材料的导电模型进行了优化和数值拟合验证,并针对CFRP传感材料开发了与之匹配的电阻测试系统,最后在实验梁中测试了CFRP传感器的实际工作可行性,具体的内容为:1、针对本课题组之前提出的力阻模型,根据实际应用条件,将其精简,并根据荷载区间重新分配了模型的影响因素的权重比例,通过本课题组的实验测试结果和文献的数据,验证了简化模型的可行性和正确性,为后续更精确测量提供了理论基础。2、针对本课题组之前的研发、制备的CFRP传感材料,和电子信息相关专业合作,开发了一套CFRP结构状态监测系统,该测试系统硬件层次是采用可编程逻辑CPLD,由Verilog语言编写电路程序,软件层次是采用C#语言基于Visual Studio窗体设计,编写的数据处理和用户界面,最后联合调试完毕并应用于实验梁测试。3、在前期材料测试、测试系统开发基础上,为了尽可能模拟承载和监测双重功能的实际工况,本文设计并完成了基于CFRP力阻效应的结构状态监测系统的梁加载实验,实验结果反映出在实际工程中,CFRP传感材料在承受复杂荷载情况下,能够通过其电阻值的变化反映出结构上的荷载、损伤和应变等变化情况。
[Abstract]:With the continuous development of structural health monitoring (SHM), intelligent materials have gradually become the focus of research, especially for the research on the perceptual performance of load-bearing materials, which is more and more favored by civil engineering scholars. In the research of intelligent characteristics of bearing materials, carbon fiber materials show excellent load-intelligent duality: first of all, in terms of bearing characteristics, carbon fiber materials are lightweight, high strength, have strong corrosion resistance and durability that traditional steel bars and other materials do not have, and its changeable material forms (wire, reinforcement, sheet, surface material) are also the important basis for its wide application; Secondly, in terms of intelligent characteristics, carbon fiber materials have the same force and resistance characteristics as strain gauges, that is, their own resistance values have obvious changes with load, so they have become a new type of intelligent structural materials which integrate bearing and monitoring functions. In this paper, supported by the National Natural Science Foundation of China, "Research on self-perception characteristics and Application of Prestressed concrete structures based on carbon Fiber Materials (51478209)", the conductive model of CFRP materials based on carbon fiber is optimized and verified by numerical fitting, and a matching resistance test system is developed for CFRP sensing materials. Finally, the feasibility of CFRP sensor is tested in the experimental beam. The specific contents are as follows: 1. According to the practical application conditions, the force resistance model proposed by our research group is simplified, and the weight ratio of the influencing factors of the model is reallocated according to the load interval. The feasibility and correctness of the simplified model are verified through the experimental test results of our research group and the data of the literature. It provides a theoretical basis for the subsequent more accurate measurement. 2, aiming at the previous research and development of our research group, the prepared CFRP sensing materials, and the professional cooperation of electronic information, a set of CFRP structural condition monitoring system is developed. The hardware level of the test system is to use programmable logic CPLD, to write circuit programs by Verilog language, and the software level is to use C # language based on Visual Studio forms to design, write data processing and user interface. Finally, the joint debugging is completed and applied to the experimental beam test. 3. On the basis of the preliminary material test and the development of the test system, in order to simulate the actual working conditions of bearing and monitoring dual functions as much as possible, this paper designs and completes the beam loading experiment of the structural condition monitoring system based on CFRP force resistance effect. The experimental results show that in the actual engineering, the CFRP sensing material is subjected to complex loads. The change of load, damage and strain can be reflected by the change of resistance value.
【学位授予单位】：江苏大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU317

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