新型钢管混凝土梁柱节点试验研究

Experimental Research on New Type of Concrete-filled Steel Tubular Column Joint to RC Beam

提出了一种新型的开大孔钢筋贯通式钢管混凝土节点,该新型节点形式与已应用到工程中的开小孔钢筋贯通式节点相比,具有施工方便的优点。建立了介于这种新节点与传统开小孔节点之间的过渡形式:开大孔加强式钢筋贯通的钢管混凝土节点。并通过对三种节点低周反复循环加载的试验研究,得到如下结论:新型开大孔式节点位移延性、耗能能力比较理想,抗震性能良好,符合抗震设计的要求。在该新型节点处设加强环和加劲肋能够显著提高节点的整体性与延性。研究结果可以为其在工程中的应用提供有价值的参考。

A new type of connection between concrete-filled steel bar and concrete frame beam with steel bar run-through joint was put forward according to the present joints. Big holes were cut in the steel tubular wall of core area of the joint. Compared with the joint which small holes were set in the steel tubular wall for steel bar running through, the new type joint was more easily to be constructed. And a transient joint was made to characterize with big holes and strengthening ring and stiffing ribs. Low cycle fatigue tests were implemented to analysis these three joints and the following conclusions were given： the displacement ductility and the ability of energy dissipation of this new type joint are more ideal and seismic behavior is better which all satisfied the requirement of the structural seismic design. The stiffening ring and stiffing ribs fixed on the joint both can improve its integrity and ductility sig- nificantly. Research results can provide theoretical and experimental reference to the engineering application.