CFRP筋-高强钢筋增强高强混凝土梁抗弯性能研究

FLEXURAL BEHAVIOR OF HIGH・STRENGTH CONCRETE BEAMS REINFORCED WITH CFRP BARS AND HIGH-STRENGTH STEEL BARS

碳纤维增强复合材料(CFRP)筋和高强钢筋混合配置在高强混凝土梁中,能更好地发挥材料各自的性能,提高建筑材料的利用率。以配有CFRP筋和高强钢筋的高强混凝土梁为研究对象,进行了弯曲破坏试验,并对其承载力进行了理论计算。研究结果表明:CFRP筋-高强钢筋高强混凝土梁表现出典型的延性破坏特征;在相同的等截面配筋的条件下,混和配筋高强混凝土梁和高强钢筋高强混凝土梁相比,极限载荷减少15%,但极限位移提高了34%;添加钢纤维的高强钢筋高强混凝土梁与未添加钢纤维的试件相比,屈服荷载和极限荷载分别提高了12.6%和15.8%。

Carbon fiber reinforced composite materials(CFRP) bars and high-strength steel reinforcement mixed in the high-strength concrete beams, can better exert the properties of the material and improve the utilization of building materials. In this paper, bending tests were carried out on high-strength concrete beams with CFRP bars and high-strength steel bars, and the theoretical calculation of its flexural capacity was derived. The results show that all the specimens exhibit typical ductile failure characteristics. Under the condition of the same nominal reinforcement ratio, compared with high-strength concrete beam with high-strength steel bars, the ultimate load of the mixed reinforced high-strength concrete beam is reduced by 15%, but the ultimate displacement is increased by 34%. Compared with high-strength concrete specimen, the yielding load and ultimate load of steel fiber high-strength concrete specimen are increased by 12.6% and 15.8%, respectively.