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提出了用于混合框架的钢梁腹板贯通、翼缘部分切除的钢梁-钢筋混凝土柱(RCS)中节点构造形式。通过对节点试件的低周往复加载试验,研究了6种不同构造措施下节点试件的破坏过程、破坏形态和抗震性能。分析了该类混合节点试件的承载力、变形能力、滞回曲线、骨架曲线、强度退化、刚度退化和耗能特性等。结果表明,该6个节点试件的破坏形态可分为两类:一类为柱端混凝土和节点区内部混凝土的局压破坏;另一类为节点核心区的剪切破坏。局压破坏的试件滞回曲线呈弓形,且曲线下降段较陡,而剪切破坏的试件滞回曲线呈反S形,曲线下降段较缓。局压破坏的试件承载力退化大,刚度退化较快。研究表明,所提出的混合节点具有良好的抗震性能,合理的节点构造措施可增强内外混凝土的共同工作性能,从而提高节点的受剪承载力和变形能力。
The joint structure of steel beam-reinforced concrete column (RCS) is proposed, which is used to cut through the flange of steel beam webs of the composite frame. Through the low-frequency reciprocating loading test of the joint specimens, the failure process, failure mode and seismic performance of the joint specimens under six different structural measures were studied. The bearing capacity, deformation capacity, hysteresis curve, skeleton curve, strength degradation, stiffness degradation and energy dissipation characteristics of the hybrid joints were analyzed. The results show that the failure modes of the six joints can be divided into two types: one is the failure of the concrete at the column end and the concrete in the node area, and the other is the shear failure in the core of the node. The hysteresis curve of the specimen under the pressure failure is arched, and the descending curve of the curve is steep, while the hysteresis curve of the specimen under the shear failure is in the shape of an inverted S, and the descending curve of the curve is relatively slow. Deformation of the specimen under pressure destructive degradation of large, rapid degradation of stiffness. The results show that the proposed hybrid joint has good seismic performance, and reasonable node construction measures can enhance the joint performance of both internal and external concrete so as to improve the bearing capacity and deformation capacity of the joint.