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以开发塑性铰区埋入隔振橡胶层的新型RC柱为目的,通过橡胶层提高RC柱的变形能力、增强延性和耗能能力,改善传统RC柱的抗震性能;探讨埋入不同厚度橡胶层RC柱的承载力-变形特性、破坏模式和抗震性能。试验及分析结果表明:反复水平荷载作用下普通RC柱的塑性铰区出现较多的水平裂缝和竖向裂缝,且裂缝宽度较大,塑性铰区混凝土的损伤和破坏均较严重,RC柱的荷载-位移曲线呈反“S”的捏拢形;塑性铰区埋入橡胶层的RC柱的初始刚度与RC柱基本相同,水平承载力有所降低,但是,橡胶层能够显著提高RC柱的变形性能,裂缝稀疏且宽度明显变小,即塑性铰区混凝土的损伤降低,荷载-位移滞回曲线呈梭形,且没有明显的下降段,比RC柱具有更好的耗能能力。在水平荷载作用下,塑性铰区埋入橡胶层RC柱的水平承载力上升速度与埋入的橡胶层厚度有关,埋入的橡胶层越厚,水平承载力上升越慢。
In order to develop a new type of RC column with plastic hinges buried in vibration-isolating rubber layer, the rubber column can be used to improve the deformability of RC column, enhance ductility and energy dissipation and improve the seismic performance of traditional RC columns. RC column bearing capacity - deformation characteristics, failure modes and seismic performance. The results of the tests and analysis show that there are more horizontal and vertical cracks in the plastic hinge zone of the ordinary RC column under repeated horizontal loads and the crack width is larger and the damage and failure of the concrete in the plastic hinge zone are more serious. The initial stiffness of the RC column embedded in the rubber layer is basically the same as that of the RC column and the horizontal bearing capacity is reduced. However, the rubber layer can significantly improve the RC The deformation performance of the column, the cracks are sparse and the width is obviously smaller, that is to say, the damage of the plastic hinge zone concrete is reduced and the load-displacement hysteresis curve is fusiform with no obvious descending section, which has a better energy dissipation capacity than the RC column. Under the horizontal load, the horizontal bearing capacity of rubber column embedded in the plastic hinge zone is related to the thickness of embedded rubber layer. The thicker the embedded rubber layer, the slower the horizontal bearing capacity increases.