论文部分内容阅读
通过对2根预应力钢带加固钢筋混凝土柱与2根未加固钢筋混凝土柱的力学性能进行对比试验,研究预应力钢带加固对钢筋混凝土轴心受压柱、偏心受压柱的破坏形态、承载力、刚度、变形能力的影响。试验结果表明:预应力钢带加固钢筋混凝土柱的破坏形态与未加固试件基本相同,但加固试件初裂荷载更大;加固后钢筋混凝土轴心受压试件、偏心受压试件承载力分别提高24%、20%,承载力提升效果显著;预应力钢带加固对轴心受压试件轴向刚度明显提高,从初始加载到荷载达到80%极限荷载的不同加载水平下,加固后轴压试件的轴向刚度与未加固试件轴向刚度的比值在1.12~1.18;经预应力钢带加固后,偏心受压试件极限荷载对应的侧向挠度增大了37%,偏压试件变形能力明显增强。
By comparing the mechanical properties of two reinforced concrete columns with two prestressed steel bars and two unreinforced reinforced concrete columns, the failure modes of reinforced concrete axial compression columns and eccentric compression columns under prestressed steel strip reinforcement are studied. Bearing capacity, stiffness, deformation ability. The experimental results show that the failure modes of reinforced concrete columns strengthened by prestressed steel strips are basically the same as that of unconfined specimens, but the initial cracking load of strengthened specimens is larger. The reinforced concrete specimens subjected to axial compression and eccentric compression specimens are carried Respectively. The axial stiffness of prestressed steel strip strengthened with axial compression increased significantly from 24% to 20%, respectively. The axial stiffness of prestressed steel strip strengthened from the initial loading up to 80% of the ultimate load, The ratio of the axial stiffness of the axial compression test specimen to that of the unrestrained test specimen was 1.12-1.18. After the prestressing steel band was strengthened, the lateral deflection corresponding to the ultimate load of the eccentric compression test specimen increased by 37% Bias specimen deformation ability was significantly enhanced.