预应力碳纤维板在桥梁加固中的应用研究

发布时间：2018-05-08 10:44

本文选题：预应力碳纤维板加固技术 + 锚具对比　；参考：《东南大学》2015年硕士论文

【摘要】：国内体外预应力加固技术在近十几年得到了长足发展,并出现了用新材料代替传统钢绞线作为预应力材料的新型加固技术。预应力碳纤维板加固技术作为这种新型加固技术的代表,其优势表现在给结构主动施加了预压力,调整梁体内力状况,显著提高桥梁结构承载力；同时相当于增加了主筋数量,刚度有所提高,减小结构变形：另外材料的性能得到充分利用,可大大节省材料降低工程造价,长期性能更优于传统桥梁加固技术,节约维护成本。因此,预应力碳纤维板加固技术有很高的研究价值及很好的应用前景。目前国内各研究机构已有不少成型的锚具,但之间的横向性能比较很少,优劣未知,到底设计成什么样的锚具缺乏指导意见。本文对目前国内主要的两类挤压式锚具和夹片式锚具进行了全面的对比分析,从构造特点、理论分析、ANSYS有限元模型分析的角度进行研究,最终得到结论：夹片式锚具是整体性能更具优势的锚具。由于预应力碳纤维板加固技术设计方法上缺乏相应设计流程和规范指导,本文对预应力碳纤维板材加固技术中关键技术问题做了细致的研究工作。确定了设计内容流程,并通过理论调研和公式推导对预应力度取值、张拉控制应力取值、预应力损失计算、局部验算等设计问题进行研究。并且结合典型混凝土桥梁,明确了运用预应力碳纤维板进行加固的设计思路,形成了一套完整的预应力碳纤维板加固设计方法。作为一种新型加固技术,加固效果好坏决定技术的应用前景。目前国内缺乏对预应力碳纤维板加固技术的施工控制技术的相关研究。本文结合预应力碳纤维板加固的技术特点,通过调研实际监控方法并结合混凝土桥梁理论,明确了预应力碳纤维板加固监控的具体内容和测点布置,根据监控结果评价加固质量,保障加固效果。本文针对预应力碳纤维板材加固技术所做的研究,对该项技术的进一步发展有-定的指导意义和参考价值。
[Abstract]:In recent ten years, the technology of external prestressing reinforcement in China has been greatly developed, and a new reinforcement technology has emerged, which uses new materials to replace the traditional steel strands as prestressed materials. As a representative of this new reinforcement technology, prestressed carbon fiber slab reinforcement technology has the advantages of exerting pre-pressure on the structure actively, adjusting the internal force of the beam body, and increasing the bearing capacity of the bridge structure, which is equivalent to increasing the number of main tendons. The stiffness is improved and the deformation of the structure is reduced. In addition, the performance of the material is fully utilized, which can greatly save the material and reduce the project cost, and the long-term performance is better than the traditional bridge reinforcement technology and the maintenance cost can be saved. Therefore, prestressed carbon fiber reinforced concrete plate reinforcement technology has high research value and good application prospect. At present, many domestic research institutions have formed anchors, but the transverse performance of the Anchorage is relatively few, the advantages and disadvantages are unknown, and what kind of anchors are designed is lack of guidance. In this paper, two main types of extruded Anchorage and clamped Anchorage in China are compared and analyzed comprehensively. From the point of view of structural characteristics, theoretical analysis and ANSYS finite element model analysis are carried out. Finally, it is concluded that clamped Anchorage is a better Anchorage with overall performance. Due to the lack of corresponding design flow and standard guidance in the design method of prestressed carbon fiber sheet strengthening technology, this paper makes a detailed research on the key technical problems in the prestressed carbon fiber sheet reinforcement technology. Through theoretical investigation and formula derivation, the design problems of prestress degree, tensioning control stress, prestress loss calculation and local check calculation are studied. Combined with typical concrete bridge, the design idea of strengthening with prestressed carbon fiber slab is clarified, and a set of complete design method of strengthening prestressed carbon fiber slab is formed. As a new reinforcement technology, the effect of reinforcement determines the application prospect of the technology. At present, there is a lack of research on the construction control technology of prestressed carbon fiber sheet reinforcement technology in China. Combining with the technical characteristics of prestressed carbon fiber slab strengthening, through investigating the actual monitoring method and combining with the theory of concrete bridge, this paper clarifies the concrete content and the measuring point arrangement of the prestressed carbon fiber slab reinforcement monitoring. The quality of reinforcement is evaluated according to the monitoring results, and the effect of reinforcement is guaranteed. In this paper, the study of prestressed carbon fiber sheet reinforcement technology is of guiding significance and reference value for the further development of this technology.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.72

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