引用本文摘 ? 要：通過自振特性測試和豎向荷載作用下的低周往復荷載試驗，對比分析了倒置外露灌漿套筒裝配式柱腳節點與傳統現澆及現行裝配式柱腳節點的整體性及抗震性能。結果表明，倒置外露灌漿套筒柱腳節點試件（NPC）的整體性與傳統現澆試件（RC）基本相當，現行裝配試件（TPC）測試所得的各階自振頻率基本均低于RC和NPC。三種柱腳節點在失效破壞時均出現了塑性鉸，且兩個裝配式柱腳節點較現澆試件其塑性鉸、柱身開裂高度均上移約1個灌漿套筒高度，宜適當延長箍筋加密區。三種柱腳節點的剛度退化規律相同，延性系數均在3.0以上，NPC的耗能能力顯著優于RC和TPC。RC、TPC、NPC對應的開裂位移角分別為1/430、1/393、1/479，對應的極限位移角分別為1/24、1/22、1/22，均分別大于規范限值，滿足抗震設防要求。 Abstract: Through test of natural vibration property and horizontal low cycle reciprocating load test under vertical load, the integrity and seismic behavior of the inverted exposed grouting sleeve prefabricated column foot joint and the traditional cast-in-place and current prefabricated column base joint were compared and analyzed. The results show that the integrity of the specimen of inverted exposed grouting sleeve column base joint (NPC) is the same as that of the traditional cast-in-place specimen (RC). The natural frequencies of current assembled specimen (TPC) are lower than those of RC and NPC. Plastic hinge appears in all three kinds of column foot joints when they failed, and the height of plastic hinge and column body crack of two prefabricated column foot joints moves up about one grouting sleeve height compared with RC, the densified area of stirrup should be extended properly. The stiffness degradation law of the specimens is the same, the ductility factors are all above 3.0, and the energy dissipation capacity of NPC is significantly better than that of RC and TPC. The corresponding crack displacement angles of RC, TPC and NPC are 1/430, 1/393 and 1/479 respectively, and the corresponding limiting displacement drift are 1/24, 1/22 and 1/22 respectively, which are greater than the code limits, meeting the seismic fortification requirements.
喬德浩,倪韋斌,王少杰,等.倒置外露灌漿套筒裝配式柱腳節點抗震性能研究[J].混凝土與水泥制品,2020(8):59-64. QIAO D H,NI W B,WANG S J,et al.Seismic Behavior of Prefabricated Column Foot Joint with Inverted Exposed Grouting Sleeve[J].China Concrete and Cement Products,2020(8):59-64.