摘要
提出了一种预应力钢带加固钢筋混凝土柱的新技术。进行了2个预应力钢带加固和1个CFRP加固的钢筋混凝土短柱的低周反复加载试验,通过与1个未加固的普通钢筋混凝土短柱的对比研究,比较分析了预应力钢带加固和CFRP加固短柱的破坏形态、滞回曲线、位移延性系数、骨架曲线、耗能性能以及刚度退化。研究结果表明,与未加固短柱相比,预应力钢带加固和CFRP加固的钢筋混凝土短柱极限荷载最大提高幅度分别为30.73%和31.04%,位移延性最大提高幅度分别为32.3%和52%。同等工况下,预应力钢带加固和CFRP加固短柱的抗震性能相近,可防止混凝土压碎剥落和纵筋屈曲,有效抑制混凝土裂缝扩展和减缓试件刚度退化,但预应力钢带加固钢筋混凝土短柱具有显著的经济优势和施工操作优势。
Concrete columns reinforced with prestressed steel strip as a new reinforcement technology is presented in the paper,and low cycle and reverse experiments on three reinforced concrete short columns are performed,two with prestressed steel strip and with CERP.By comparing to one normal non reinforced specimens,several properties of prestressed steel strip and CFRP reinforced column are presented,such as failure modes,hysteresis curves,displacement ductility ratio,skeleton curves,energy dissipation performance and stiffness degradation and so on.The results show that the maximum increases of ultimate load of column confined by prestressed steel strip and CFRP are 30.73%and 31.04%respectively,and the maximum increases of ductility of displacement are 32.3% and 52% respectively.Under the same conditions,the confined specimens show similar seismic performance,which prevents concrete from crushing and longitudinal reinforcement from yielding;crack propagation and stiffness degradation of concrete specimen can be ameliorated.But the prestressed steel strip reinforced concrete short column have numerous distinctive advantages in economy and construction operations.
出处
《防灾减灾工程学报》
CSCD
北大核心
2015年第3期313-320,共8页
Journal of Disaster Prevention and Mitigation Engineering
基金
陕西省教育厅专项科研基金项目(14JF014)资助
关键词
预应力钢带
CFRP
加固技术
钢筋混凝土短柱
抗震性能
prestressed steel strip
CFRP
reinforcement technology
reinforced concrete short column
seismic performance
