碳纤维布加固混凝土框架抗震性能试验研究

Experimental Study on Seismic Behavior of Reinforced Concrete Frame Strengthened by Carbon Fiber Sheets

为研究碳纤维布加固方式对混凝土框架结构抗震性能的影响,按1:2缩尺比例设计制作了3榀单层钢筋混凝土框架试件,进行了低周反复荷载试验.通过对比完好框架、碳纤维布加固受损与未受损框架,研究了3榀框架的破坏形态、滞回性能、骨架曲线及承载能力.结果表明:采用碳纤维布加固框架能有效改善其受力性能和抗震能力,提高结构抗倒塌能力;采用碳纤维布加固受损框架能有效提高其极限承载能力,对结构的延性性能也有一定的改善效果;采用碳纤维布加固未受损框架,能显著提高框架的极限承载能力和抗震性能,使其具有良好的滞回耗能能力.

Three single-story frames designed with 1 ： 2 scale model were tested under- cyclic loadings to investigate the effect of the reinforcement with carbon fiber sheets（CFS） on the seismic performance of the specimens. Comparing a good specimen with a damaged one, both of which are strengthened by CFS, the main indexes were studied such as experimental phenomena, hysteretic performance, the skeleton curves, bearing capacity and so on. The result shows that using CFS to strengthen a reinforced concrete frame can effectively improve its mechanical properties, seismic performance and collapse resistance behavior. Strengthening the damaged specimen by CFS can increase the ultimate bearing capacity, but the effect of improving its ductility is not obvious. The ultimate bearing capacity and seismic performance can be improved by CFS when it is the good one, and the energy-dissipation capacity of it can also be enhanced.