钢筋混凝土梁-圆钢管混凝土柱环梁节点抗弯设计研究

Bending design research of ring beam joint with RC beam and circular concrete-filled steel tubular column

运用ANSYS软件建立了钢筋混凝土梁-圆钢管混凝土柱环梁节点有限元模型,分析了环梁钢筋与混凝土的应力分布规律,通过简化环梁受压区混凝土受压应力分布,推导了节点抗弯承载力设计公式,为环梁节点的设计提供了新的方法和思路。主要结论有:环梁最大扭矩截面和环筋最大受力截面均在框架梁侧位置;弯矩作用下环梁扭矩的大小受框架梁宽度和钢管半径之比的影响,比值越大,扭矩越小。

Software ANSYS was used to build the finite element models of ring beam joint with RC beam and circular concrete-filled steel tubular column. The stress distribution laws of the reinforcement and concrete of the ring beam were studied. By simplifying stress distribution in the compression zone of ring beam, bending capacity design formulas were derived, providing a new method for the design of the ring beam joint. The main conclusions are as follows. The maximum torque cross-section of ring beam and maximum force cross-section of ring rebar are all located at the side position of the frame beam. The torsion value of ring beam under bending moment is in inverse proportion with the ratio of frame beam width and tube radius.