Abstract The collar plate (CP) is applicable for the reinforcement of both new designed and in-service joints, yet the design approach for the reinforcement requires further investigation. The current paper investigates the effect of various geometrical parameters as well as chord stress ratios on the compressive capacity of the collar plate reinforced (CPR) square hollow section (SHS) T-joints. The finite element (FE) models of the CPR SHS T-joints are built and validated using experimental data. Extensive parametric studies are carried out to evaluate the influence of parameters such as the brace to chord width ratio, the width/length and thickness of the CP, as well as the chord stress ratio. The brace to chord width ratio and the CP thickness are identified as the key parameters, and three typical failure modes are observed. Finally, bearing mechanism of CPR T-joints is discussed and design equations are proposed based on the failure modes. The failure-mode-based equations agree well with both parametric data and orthogonal analysis results, which provides reference for the practicing engineers.

中文翻译：

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领板增强 SHS T 型接头的抗压强度：几何参数和弦应力比的影响

摘要 领板（CP）适用于新设计和在役接头的加固，但加固的设计方法需要进一步研究。目前的论文研究了各种几何参数以及弦应力比对加强领板 (CPR) 方形空心截面 (SHS) T 型接头抗压能力的影响。CPR SHS T 型接头的有限元 (FE) 模型是使用实验数据构建和验证的。进行了广泛的参数研究以评估诸如支撑与弦宽比、CP 的宽度/长度和厚度以及弦应力比等参数的影响。支撑弦宽比和 CP 厚度被确定为关键参数，并观察到三种典型的失效模式。最后，讨论了CPR T型接头的承载机理，并根据失效模式提出了设计方程。基于失效模式的方程与参数数据和正交分析结果均吻合良好，可为实践工程师提供参考。