论文部分内容阅读
碳纤维增强复合材料是一种脆性材料,其变形能力远低于钢材,应用于建筑及桥梁结构加固有可能削弱原结构的延性。预应力碳纤维加固技术具有充分利用材料性能,改善结构应力分布的优点,但对碳纤维施加预应力将伴随产生初始应变,碳纤维的剩余变形更少,对加固结构延性的影响也更大。本文对碳纤维面积、初始应变等参数与结构屈服曲率、破坏曲率之间的关系进行推导,通过确定延性系数来设计碳纤维的加固参数,以达到控制结构延性的目的。在此基础上根据推导的结果进行实例分析,并将延性控制的计算结果与已有的试验研究结果进行对比,试验结果与理论计算结果吻合良好,表明提出的延性控制方法正确有效。
Carbon fiber reinforced composites are brittle materials with much lower deformation capacity than steel, and their application to the reinforcement of buildings and bridge structures may weaken the ductility of the original structure. The prestressed carbon fiber reinforced technology has the advantages of fully utilizing the material properties and improving the stress distribution of the structure. However, prestressing the carbon fiber with the initial strain will produce less residual deformation of the carbon fiber and greater influence on the ductility of the reinforced structure. In this paper, the relation between the area of carbon fiber and the initial strain and the yield curvature and failure curvature of the structure is deduced. The reinforcement parameters of carbon fiber are designed by determining the ductility coefficient so as to achieve the purpose of controlling the ductility of the structure. On this basis, the case analysis is carried out based on the deduced results. The calculated results of ductility control are compared with those of the existing experimental results. The experimental results are in good agreement with the theoretical results. It shows that the proposed ductility control method is correct and effective.