方鋼管混凝土柱-H形鋼梁槽鋼栓接節點抗震性能有限元分析

摘" 要：提出一種方鋼管混凝土柱-H形鋼梁槽鋼栓接節點，建立節點的ABAQUS有限元模型，對模型進行低周往復加載，分析側板和槽鋼厚度、側板高度變化對節點抗震性能和轉動剛度的影響。對節點的承載力、滯回曲線、骨架曲線、剛度退化曲線以及節點彎矩-轉曲線等參數進行對比分析。結果表明，節點具有良好的承載力和耗能能力，增加側板和槽鋼厚度能使滯回曲線變得更加飽滿，節點的承載力、割線剛度均有較大的提升；側板高度增加對節點抗震性能的影響較小；增加側板和槽鋼厚度能明顯提高節點剛度，側板高度增加對節點剛度的提高較小。

關鍵詞：方鋼管混凝土柱；栓接節點；抗震性能；節點剛度；有限元分析

中圖分類號：TU398.9" " " 文獻標志碼：A" " " " " 文章編號：2095-2945（2023）28-00５９-0４

Abstract： A kind of channel steel bolted joint between concrete-filled square steel tube column and H-shaped steel beam is proposed， and the ABAQUS finite element model of the joint is established. The low-cycle reciprocating loading of the model is carried out. The effects of side plate thickness and channel steel thickness and side plate height on the seismic performance and rotational stiffness of the joints are analyzed. The bearing capacity， hysteretic curve， skeleton curve， stiffness degradation curve and moment-rotation curve of joints are compared and analyzed. The results show that the joint has good bearing capacity and energy dissipation capacity， and the hysteretic curve becomes fuller with the increase of the thickness of side plate and channel steel， and the bearing capacity and Secant stiffness of the joint are greatly improved. The increase of side plate height has little effect on the seismic performance of joints; increasing the thickness of side plate and channel steel can obviously improve the joint stiffness， while the increase of side plate height has little effect on the joint stiffness.

Keywords： concrete-filled square steel tubular columns; bolted joints; seismic performance; joint stiffness; finite element analysis

鋼管混凝土結構將混凝土澆筑在鋼管內，在一定軸壓下鋼管對混凝土產生約束進而提高混凝土的強度，改善混凝土脆性。混凝土也能延緩或避免鋼管發生屈曲。在工程實踐中通常采用鋼管混凝土柱和鋼梁的結構體系。鋼梁-鋼管混凝土柱節點是結構體系中的關鍵部分[1-2]。

早期的鋼管混凝土柱-鋼梁連接節點主要采用焊接連接或栓焊混合連接的剛性節點。剛性節點轉動能力和延性較差，易發生脆性破壞，因此有學者開始探索采用全螺栓節點代替剛性節點。李自林等[3]對隔板貫通式全螺栓連接節點的抗震性能進行了研究，研究結果表明，整體式隔板耗能能力強，在梁柱線剛度比較小時，適當增加梁高能提高節點的承載力。……