【摘要】 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。更多还原

【Abstract】 A novel reinforced concrete column-steel beam( RCS) frame interior joint with tapered-flange-type details was provided in investigation. Cyclic tests of six specimens were conducted to examine the failure process,failure modes and seismic behavior of the RCS joint with various details. Several indexes such as the capacity,ductility,hysteretic curve,skeleton curve,strength degradation,stiffness degradation and energy dissipation capacity of specimens were analyzed. It is shown that there are two failure modes occur during the test. The local bearing failure occurs in specimen RCSJ1,RCSJ2 and RCSJ4,in which concrete were crushed out in the end of column and in the interior part of joint; the shear failure occurs in the other three joints,in which concrete in the exterior part of joint were also crushed out besides that in local failure. The hysteretic loops of the specimens with local failure take on bow shape,while those of the specimens with shear failure take on inversed "S " shape. The strength and stiffness degradation of the specimens with local failure is faster than that of the specimens with shear failure. The hybrid frame joint presented in this investigation shows good seismic behavior; proper joint details can enhance the cooperative performance of interior concrete and exterior concrete in joint,and thus can enhance the shear capacity and deformation capacity of joint.更多还原