持载状态下碳纤维布加固损伤混凝土框架抗震试验研究

EXPERIMENT STUDY ON SEISMIC BEHAVIOR OF RC FRAMES STRENGTHENED BY CFRP SHEETS WITH DIFFERENT DAMAGED DEGREE AT SUSTAINING LOAD

以某二层工业厂房的钢筋混凝土框架为原型,按1/3的缩尺模型,设计、制作3榀尺寸及配筋相同的钢筋混凝土框架试件。首先分别对框架施加水平低周反复荷载,使其处于不同损伤状态(截面开裂、钢筋屈服),保持竖向荷载不变,对其进行碳纤维布加固。然后再对加固框架进行同样试验。基于试验值,分析了加固框架的滞回曲线、骨架曲线及抗震能力;比较碳纤维布加固不同损伤混凝土框架的抗震性能。结果表明,碳纤维布加固的不同损伤钢筋混凝土框架均具有良好的抗震性能和使用性能,为大震后损伤混凝土框架加固提供理论依据。

Based on two-layer industry workshops as project background, three RC frame models with the scale 1/3 was designed and produced, with the same size and reinforcement. First, low-cyclic repeated load is imposed on the three RC frame models so that they are in a different degree of damage, then, strengthened by CFRP in conditions of constant loading. Second, the same experiments for the strengthened frames are done again. Based on the data from test, the curves such as load- displacement hysteresis curve, load-skeleton curve and seismic capacity of damaged RC frame strengthened hy CFRP are analyzed. And seismic properties of the different damaged RC frames strengthened by CFRP are compared. The results show that the different damaged RC frames strengthened by CFRP have good seismic performance and serviceability. Which provides a theoryetic basis for strengthening a damaged RC frame after rare earthquake.