为研究覆板及环口板加强方钢管 T 型节点的受压性能，建立并验证了加强节点的有限元分析模型，考察了支管宽度和加强板尺寸等参数的影响规律，分析了加强节点的破坏形态及承载力设计方法． 参数分析结果表明: 支管宽度与加强板厚度是影响覆板和环口板加强节点受压性能的关键参数，并决定了加强节点的破坏模式; 当支管 － 主管宽度比超过 0． 8 或加强板与主管厚度比大于 2． 2 时，节点发生主管侧壁屈曲控制的破坏形态，没必要继续增加加强板厚度; 文中提出的新型环口板加强方法可以较好地增强主管翼缘和侧壁，阻止或延迟主管侧壁屈曲的发生． 文中还采用现有规范和文献的设计公式，计算了覆板及环口板加强节点的受压承载力，验证了各公式的适用范围，从而为该类加强节点的设计提供参考．

A series of finite element models were established and verified to study the compressive behavior of doubler or collar plate-reinforced square hollow section T-joints． The influence of the width of the brace and the thickness of the reinforcement plate was investigated． The control failure modes as well as the design formulas of the compressive capacity of reinforced T-joints were summarized． The parametric analysis indicates that the width of the brace and the thickness of the reinforcement plate are key parameters that influence the compressive behavior of doubler and collar plate，and they also determine the failure mode of the reinforced T-joints． When the width ratio of brace and chord exceeds 0． 8，or the thickness ratio of plate and chords more than 2． 2，the failure of the joint is dominated by the buckling of the chord side wall． Under this condition，it is unnecessary to further increase the thickness of the reinforcement plate． The proposed novel reinforcement method with collar plate is efficient to rein- force the flange and side wall of the chord，thus to prevent or delay the side wall buckling of the chord． The exist- ing design formulas from the literatures were finally introduced to calculate the compressive capacity of the plate re- inforced joints，and the applicability of each formula is checked and discussed