【摘要】 针对桥梁钢筋混凝土(RC)短柱刚度大而剪跨比小的特点,通过试验方法研究其抗震性能。制作了7个受剪承载力不足的短柱试件,在恒定轴力作用下分别进行未加固短柱、碳纤维(CFRP)加固短柱和玻璃纤维(GFRP)加固短柱的拟静力试验和网络拟动力试验。分析各试件的滞回曲线、骨架曲线、累积耗能曲线和刚度退化曲线,研究其延性、强度和刚度,并初步比较了拟静力试验结果与拟动力试验结果的差异。试验结果表明:FRP加固RC短柱能够在基本不改变结构动力特性的条件下,有效地增加延性,改善抗震性能;试件在拟动力试验中耗能能力小于拟静力试验中耗能能力。研究成果可为加固RC结构的抗震分析和工程设计提供参考。更多还原

【Abstract】 Since reinforcement concrete short column of bridge had a large stiffness but its shear span ratio was small,the seismic testing method was used to explore the seismic performances.Seven specimens lacking of shearing strength were constructed,quasi-static testing(QST) and the networked pseudo-dynamic testing(NPDT) were carried out under an invariable axial force,the models included specimens which were not retrofitted,specimens retrofitted by carbon fiber reinforced plastic(CFRP) and specimens retrofitted by glass fiber reinforced plastic(GFRP).The results under different working conditions were analyzed and compared.The hysteretic curve,skeleton curve,energy dissipation curve and stiffness degradation curve were obtained.Furthermore,the ductility,strength and stiffness were researched,and the difference between results of QST and NPDT were compared.The results indicate that the RC short columns retrofitted by fiber reinforced plastic have superior ductility so as to enhance the seismic performances effectively,but have no influence on dynamic characteristics.The energy dissipation capacity of specimens under NPDT is less than under QST.The research provides reference to seismic analysis and engineering design of retrofitted reinforcement concrete structures.更多还原