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通过对两层两跨带有施工缝钢筋混凝土框架的低周反复荷载试验,对表征其抗震性能的塑性铰、层间位移、耗能能力、强度退化和刚度退化进行对比分析。研究表明:框架施工缝处容易形成塑性铰,会使结构位移变大;带有施工缝的框架比整浇框架的位移延性系数普遍有所降低;由于施工缝的存在,混凝土框架结构的耗能能力有所下降,承载能力有所下降,刚度退化影响不大。
The plastic hinges, interlayer displacements, energy dissipation, strength degradation and stiffness degradation, which characterize the seismic performance, were compared and analyzed through the low-cycle repeated loading test of two-span two-span reinforced concrete frame with construction joints. The results show that the plastic joints are easily formed at the construction joints of the frame, and the displacement of the structure becomes larger. The displacement ductility coefficient of the frames with construction joints is generally lower than that of the cast-in-situ frames. Due to the existence of construction joints, Decreased capacity, carrying capacity declined, stiffness degeneration has little effect.