十字截面钢管混凝土柱框架中柱节点抗震性能对比研究

现行框架节点试验研究多侧重于平面节点,而结构和构件在地震作用下均处于空间受力状态,为比对平面节点与空间节点的受力性能差异,以十字形截面钢管混凝土异形柱-钢梁中柱节点为研究对象,设计并制作了两个空间节点模型和两个平面节点模型,通过施加恒定轴压比的竖向荷载和低周反复水平荷载,对节点模型进行了加载破坏试验.结果表明:空间节点和平面节点破坏现象基本一致,都具有良好的延性和耗能能力,平面节点更优.轴压比对节点的承载力和延性性能有一定的影响,随着轴压比增大,延性性能降低.

Comparison and Analysis on Seismic Behavior of Interior Joints in the Composite Frame Consisting of CFST Crisscross Section Columns and Steel Beams

Most of the previous experimental research on baem-column connections focused on the in-plane behavior under unidirection loadimg,which may not reflect the real behavior of structures and members subjected to multidirectional earthquaks.In order to analyze the differences of mechanical performance in 2D joints and 3D joints,by taking interior joints in the composite frame consisting of Concrete-Filled Steel Tubular(CFST) crisscross section columns and steel beams as the research object,two models of 2D joints and two models of 3D joints are designed and manufactured,and the destruction test on the model is carried out under vertical stable loads and lateral cyclic loads.The test results show that 2D joints and 3D joints appeared the same destruction features basically,and all test joints have good ductility and energy dissipation capacity but 2D joints are better.With the increase of axial compression ratio,the bearing capacity of the joints increased,and the deformation capacity and ductility will be decreased.