基于滞回耗能的HRBF500 RC柱抗震性能研究

Study on seismic behavior of HRBF500 RC column based on hysteretic energy

目前,我国对于细晶粒钢筋(HRBF)的应用研究还处于起步阶段,试验数据和工程实例较少。通过对配置500MPa细晶粒钢筋的混凝土柱的低周反复加载试验,从滞回耗能的角度,进行抗震性能的研究。给出试验构件的累积滞回耗能时程曲线和累积滞回耗能随加载循环位移的变化曲线,分析构件在轴压比、配箍率、剪跨比不同的情况下累积耗能的变化趋势,同时指出累积耗能指标的缺陷。通过计算构件的能量耗散系数,对构件的抗震性能优劣进行讨论。基于构件的塑性滞回耗能,定义构件的能量延性系数,与计算出的能量延性系数进行对比,两者具有一定的正相关趋势。最后与普通钢筋混凝土柱的试验结果进行对比分析,认为细晶粒高强钢筋混凝土构件符合现行规范中对于构件抗震性能的要求和一般规律,可以应用于有抗震设防要求的结构中。

At present, the research and application of the fine-grained steel bar （HRBF） are still in a primary stage. There are few examples of practical engineering and experiment data. To investigate the seismic behavior of HRBF500 RC column based on hysteretic energy, the cycle loading tests were conducted. The cumulative hysteretic energy-time curve and energy-displacement curve are given. The influence laws of axial compression ratios, stirrup rates and shear span ratios on hysteretic energy are obtained and the defect of the cumulative hysteretic energy parameters is found. By calculating the energy dissipation coefficient, the seismic performance is discussed. Based on hysteretic energy, an energy ductility coefficient is defined, which is positively related to energy ductility coefficient. Compared with the common RC column test results, the RC members with fine-grained steel bar agree well with the seismic requirements in specifications and can be used in structures to resist earthquake.