钢管混凝土叠合方柱-混凝土方梁边节点非线性分析

Nonlinear Performance Analysis of Concrete Filled Steel Tube Composite Square Column-Concrete Square Beam Edge Joint

钢管叠合柱结构由于其良好的抗震、抗火性能,近些年在建筑领域得到了广泛地研究和应用。基于实际案例,应用ABAQUS平台对叠合方柱-普通混凝土方梁节点进行了非线性有限元分析,分析了构件在柱端轴压梁往复荷载作用下破坏阶段柱的工作机理,探究不同参数对叠合方柱-混凝土方梁节点构件滞回性能和骨架曲线的影响。结果表明:对于叠合方柱-混凝土方梁结构,梁中钢筋牌号、梁截面高度、梁中钢筋主筋直径对滞回曲线和骨架曲线影响显著,柱中钢管牌号、柱端轴压、梁中箍筋间距对滞回曲线和骨架曲线影响不显著;在柱端恒定轴压、梁端往复荷载作用下,叠合柱中钢管混凝土可以协助柱抵抗轴向作用和分担剪力作用,外围钢筋混凝土主要承担剪切作用。

Steel tube composite column structure has been widely studied and applied in the construction field in recent years because of its good seismic and fire resistance performance.Based on practical cases,the nonlinear finite element analysis of composite square column-ordinary concrete square beam joints is carried out by using ABAQUS platform.The working mechanism of the column in the failure stage of the member under the cyclic load of the axial compression beam at the column end is analyzed,and the effects of different parameters on the hysteretic behavior and skeleton curve of the composite square column-concrete square beam joints are explored.The results show that for the composite square column-concrete square beam structure,the grade of steel bar in the beam,the height of beam section and the diameter of main reinforcement in the beam have significant effects on the hysteretic curve and skeleton curve,while the grade of steel pipe in the column,the axial pressure at the end of the column and the spacing of stirrups in the beam have no significant effects on the hysteretic curve and skeleton curve;under the constant axial pressure at the column end and the reciprocating load at the beam end,the concrete filled steel tube in the composite column can help the column resist the axial action and share the shear action,and the peripheral reinforced concrete mainly bears the shear action.