碳纤维增强复合材料加固再生混凝土复合受扭柱抗震性能试验研究

Experimental Research on Seismic Performance of CFRP Reinforced Recycled Aggregate Concrete Composite Torsional Columns

为探究碳纤维增强复合材料(CFRP)加固再生混凝土复合受扭柱的抗震性能,设计了2根CFRP加固再生混凝土柱试件和1根未采用CFRP加固的再生混凝土柱试件,并进行了复合受扭下的拟静力试验,分析了应变、裂缝发展规律及破坏形态。结果表明:2根CFRP加固试件发生扭型破坏,1根未加固试件发生弯扭型破坏;CFRP加固柱试件具有更好的抗震性能,峰值扭矩和延性系数分别提升了44.68%、71.41%,强度衰减、刚度退化、耗能及累积损伤等性能都得到明显提升;纵筋配筋率对试件的抗震性能影响不大,峰值扭矩提升了5.45%,刚度退化及累积损伤等性能得到改善。

In order to study the seismic performance of CFRP reinforced recycled aggregate concrete composite torsional columns,two specimens reinforced by CFRP and one specimen not reinforced by CFRP were designed and carried out pseudo-static tests under composite torsional conditions,and the strain,crack development law and failure mode were analyzed.The results showed that two CFRP reinforced specimens had undegone torsional failure,and one unreinforced specimen had undergone bending and torsional failure.CFRP reinforced column specimens had better seismic performance,the peak torque and ductility coefficient increased by 44.68%and 71.41%,respectively,and the strength attenuation,stiffness degradation,energy dissipation and cumulative damage were significantly improved.The ratio of longitudinal reinforcement has little effect on the seismic performance of the specimen,the peak torque is increased by 5.45%,and the stiffness degradation and cumulative damage were improved.