预应力碳纤维板加固受弯构件的延性控制方法

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。

Ductile controlling method of flexual members strengthened with prestressed carbon fiber reinforced ploymer plate

Because carbon fiber reinforced polymer(CFRP) composite is a brittle material and its deformability is far below steel,so if it is applied to strengthening of building and bridge structures the ductility of original structures may well be reduced.Although prestressed CFRP strengthening technique possesses many merits such as full utilization of material property and improve of the distribution of structural stress,the initial stain of carbon fiber generates due to pretension and the remaining deformation of...