CFRP加固钢箱梁受力性能研究

发布时间：2018-12-15 16:59

【摘要】：随着经济快速发展,国内外基础设施中兴建了大量钢结构。现今有许多钢结构的安全性已无法满足使用要求,需对其进行加固和修复。目前,CFRP加固钢结构已成为结构加固的热点之一,相较于传统的钢结构加固技术而言,CFRP加固钢结构技术具有自身独特的优势,如不产生严重的应力集中和残余应力、施工简便等。但是,CFRP加固钢结构仍有一些问题有待于研究。本文对CFRP加固钢结构进行了较为系统的理论分析,并研究了采用顶升反拱法对钢箱梁进行粘贴CFRP加固。主要研究内容如下：(1)首先对CFRP加固钢结构的关键问题进行综合阐述,包括粘结机理、加固后结构破坏类型、施工工艺以及耐久性。(2)对粘贴CFRP的拉伸构件的界面应力和有效粘结长度进行分析,同时针对粘贴CFRP加固受弯钢梁之间的界面应力进行分析,并推导出它们之间的界面剪应力和剥离应力,为下一步的工程实际研究提供理论依据。(3)结合工程实际论述了顶升反拱法对钢箱梁进行粘贴CFRP加固的基本原理和施工工艺,并量测加固前后钢箱梁梁底的应力和挠度变化情况。通过分析所采集到的数据可知CFRP加固钢箱梁能有效地提高钢箱梁的承载力。(4)通过有限元软件ANSYS对受弯钢箱梁粘贴CFRP加固后的受力性能进行了分析,得到了荷载—应力曲线、荷载—挠度曲线。将数值分析结果与实际加固结果进行对比分析,验证模型的精确性,并对加固效果的主要影响因素进行参数分析,探讨这些因素对加固效果的影响。通过对CFRP加固钢箱梁进行理论分析和实际加固工程的研究得到若干结论和建议,可以为今后工程实践中CFRP加固修复钢结构的设计与施工提供借鉴。
[Abstract]:With the rapid development of economy, a large number of steel structures have been built in the infrastructure at home and abroad. Nowadays, many steel structures can not meet the requirements of safety and need to be strengthened and repaired. At present, steel structure strengthened by CFRP has become one of the hotspots in structural strengthening. Compared with the traditional steel structure strengthening technology, CFRP strengthening steel structure technology has its own unique advantages, such as no serious stress concentration and residual stress. Simple construction, etc. However, there are still some problems in steel structure strengthened by CFRP. In this paper, a systematic theoretical analysis of steel structure strengthened with CFRP is carried out, and the reinforcement of steel box girder with CFRP by means of jacking and reverse arch method is studied. The main research contents are as follows: (1) the key problems of steel structure strengthened by CFRP are expounded, including bonding mechanism, failure type of strengthened structure, Construction technology and durability. (2) the interface stress and effective bond length of tensile members bonded with CFRP are analyzed, and the interfacial stresses between flexural steel beams strengthened with CFRP are analyzed. The interfacial shear stress and peeling stress between them are deduced, which provides a theoretical basis for the further engineering research. (3) combined with the engineering practice, the basic principle and construction technology of the steel box girder strengthened with CFRP by the jacking reverse arch method are discussed. The stress and deflection of steel box girder before and after reinforcement were measured. Through the analysis of the collected data, it can be seen that CFRP can effectively improve the bearing capacity of the steel box girder. (4) the mechanical behavior of the flexural steel box girder strengthened with CFRP is analyzed by the finite element software ANSYS. The load-stress curve and load-deflection curve are obtained. The numerical analysis results are compared with the actual reinforcement results to verify the accuracy of the model, and the main factors affecting the reinforcement effect are analyzed, and the influence of these factors on the reinforcement effect is discussed. Through the theoretical analysis of CFRP strengthened steel box girder and the study of practical reinforcement engineering, some conclusions and suggestions are obtained, which can be used for reference in the design and construction of steel structure strengthened and repaired by CFRP in the future engineering practice.
【学位授予单位】：福州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU391

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