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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。
Aiming at the characteristics of large rigidity of RC RC columns and small shear span ratio, the seismic performance of RC RC columns is studied through the test method. Seven short column specimens with insufficient shear capacity were fabricated and subjected to quasi-static tests of unreinforced stub columns, carbon fiber (CFRP) stiffened stub columns and GFRP stiffened columns under constant axial force and Network simulation test. Hysteresis curves, skeleton curves, cumulative energy dissipation curves and stiffness degradation curves were analyzed. The ductility, strength and stiffness of the specimens were analyzed. The differences between the quasi-static tests and the pseudo-dynamic tests were also compared. The experimental results show that the FRP reinforced RC stub columns can effectively increase the ductility and improve the seismic performance without changing the dynamic characteristics of the structure. The energy dissipation capacity of the specimens in the pseudo-dynamic test is less than that of the quasi-static test. The research results can provide references for the seismic analysis and engineering design of reinforced RC structures.