对支管受轴向压力作用的垫板加强Y型圆钢管节点进行了非线性有限元分析,研究了几何参数对加强型节点受压极限承载力的影响。分析表明,设置适当尺寸的垫板能够增强Y型圆钢管相贯节点承受荷载和抵抗变形的能力。用多元线性回归法求出垫板加强Y型圆钢管节点受压极限承载力提高系数φp的回归方程,从而提出了垫板加强Y型圆钢管节点受压极限承载力的建议公式。 The nonlinear finite element analysis of the Y-shaped circular steel pipe joints strengthened by the axial pressure of the branch pipe was carried out. The influence of geometrical parameters on the ultimate bearing capacity of the strengthened joints was studied. The analysis shows that the proper size of the plate can enhance the load-bearing capacity of Y-shaped tubular cross-section joints and resist the deformation. The regression equation of the coefficient of increase of the ultimate bearing capacity of the Y-joints is obtained by the multiple linear regression method. The proposed formula of the bearing plate for strengthening the ultimate bearing capacity of Y-joints is proposed.