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为研究预应力高强混凝土管桩的抗震性能,对5个预制桩身与后浇筑承台的组合体试件节点进行低周往复拟静力加载试验,分析5个组合体试件节点的破坏特征、承载力、延性、滞回曲线及耗能性能等抗震指标,研究预制桩身与承台连接节点对整个组合体试件抗震性能的影响。研究结果表明:在桩身内安放钢筋笼并深入承台的锚固钢筋无论是直放还是弯折均可明显改善管桩-承台组合体试件的整体性,提高组合体试件节点的承载能力、延性、耗能能力,改善组合体试件节点的变形能力,且后者提高的效果优于前者;通过连接板焊接的锚固钢筋试件的承载能力、变形能力、耗能能力较好,且锚固钢筋弯折的节点承载能力、抗震性能优于直放试件。
In order to study the seismic behavior of prestressed high-strength concrete pipe piles, low-cycle reciprocating quasi-static loading tests were carried out on the joints of five composite precast pile foundations and post-pouring pile caps. The failure characteristics of five composite specimens were analyzed , Bearing capacity, ductility, hysteresis curve and energy dissipation performance. The influence of prefabricated pile body and cap connecting joints on the seismic performance of the whole composite specimen is studied. The results show that the anchorage reinforcement placed in the pile body and penetrating into the platform can improve the integrity of the pile-cap combination specimen and improve the bearing capacity of the joint , Ductility and energy dissipation capacity, and improve the deformation capacity of the joint of the composite body specimen, and the latter effect is better than the former; the load carrying capacity, deformation ability and energy dissipation capacity of the anchoring steel bar welded by the connecting plate are good, and Anchoring reinforcement bending node carrying capacity, seismic performance is better than direct test specimens.