带钢暗梁的板柱结构边节点抗弯性能研究

Research on Flexural Performance of Edge Joint of Column-Slab Structure with Steel Concealed-Beam

板柱结构以其传力途径简捷、布置灵活等优势,在工程中得到了广泛的应用,但其也存在容易发生冲切破坏等不足。目前的研究主要集中在板柱结构中柱节点,关于边节点的研究则相对较少,但边柱对结构安全同样至关重要。首先建立了带钢暗梁的钢筋混凝土空心楼盖-钢管混凝土柱边节点有限元模型,并与其他学者的试验结果进行对比,验证了有限元模型的准确性。采用验证过的有限元模型,分析了混凝土楼板厚度、楼板混凝土强度、钢暗梁翼缘宽度等参数对节点抗弯性能的影响。研究结果表明:参数变化对正、负弯矩区的影响不同,楼板厚度、钢暗梁翼缘厚度、强度和高度的增大可以提高节点的抗弯承载力,但是过厚的楼板和楼板混凝土强度的提升会降低节点变形能力;方钢管厚度和轴压比的变化对节点抗弯性能影响不大。

The slab-column structure has been widely used in engineering with its advantages of simple force transmission path and flexible arrangement.However,it also has deficiencies such as easy to result in punching shear failure.The current research mainly focuses on the middle joints in the slab-column structure,and there is relatively little research on the side joints,but the performance of the side joints is also critical to the structural safety.In this paper,the finite element model of reinforced concrete hollow floor with steel concealed beam-concrete filled square steel tubular column edge joint is firstly proposed and compared with other scholars'test results to verify the accuracy of the finite element model.Based on this verified finite element model,parametric study including concrete floor thickness,concrete strength of floor,flange thickness of steel concealed beam are analyzed.The study shows that the parameter changes have different effects on the positive and negative moment zones.The increase of floor thickness,steel concealed beam flange thickness,strength and height can improve the flexural bearing capacity of the joint,but the too thick floor slab and the increase floor concrete strength will reduce the deformation capacity of the joints.As for the change of square steel tubular thickness and axial compression ratio,it will have little effect on the flexural performance of the joint.