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既有钢筋混凝土构件的特性不同于拟建构件,除了可能存在设计构造方面的不足之外,还受到所经受的荷载历程和环境腐蚀的影响。根据5根既有钢筋混凝土梁的低周往复加载试验,得到了既有钢筋混凝土梁的破坏特征。根据试验中得到的滞回曲线计算既有钢筋混凝土梁的耗能能力和延性,分析了不同的加载制度对其耗能能力的影响。结论表明,既有构件所经历的最大荷载及最大荷载出现的相对时序均会影响到既有构件的抗震性能。
The characteristics of the existing RC members are different from those of the proposed ones. In addition to the possible lack of design structure, the existing RC members are also affected by the load history and environmental corrosion experienced. According to the low cycle reciprocating loading tests of five existing RC beams, the failure characteristics of the existing RC beams are obtained. According to the hysteresis curve obtained in the experiment, the energy dissipation capacity and ductility of the existing RC beams are calculated, and the influence of different loading systems on their energy dissipation capacity is analyzed. The conclusion shows that both the maximum load experienced by the existing components and the relative timing of the maximum load will affect the seismic performance of the existing components.