A comprehensive experimental study on unstiffened T-stubs was conducted in order to examine the effects of parameters influencing the capacities of the T-stubs. Pursuant to this goal, 35 unstiffened T-stubs were tested under monotonic loading up to failure, where significantly large deformations were observed. Flanges of T-stubs were selected from the thin plates of 6, 8 and 10 mm whereas bolts were selected as the large bolt of 27 mm. In this way, the capacity of T-stubs was governed by the bending capacity of flanges. Thickness of flange, width of flange, distance from a T-stub stem to bolt row, edge distance, bolt diameter and thickness of weld are selected as the parameters. The results showed that unstiffened T-stubs with thin plates and large bolts can exhibit significantly high ductility and capacity. Moreover, the results revealed that the design recommendations given by AISC 358-16 and EN1993-1-8 predict the capacities of T-stubs conservatively. The average ratios of the actual to predicted plastic capacity by AISC 358-16 and EC3:1-8 are 1.96 and 1.66 (1.34 for Method 2), respectively. These ratios modify to 8.36 and 7.14 (5.88 for Method 2) for the ultimate capacity. The source of the underestimation is attributed to the distance between the plastic hinges. A new yield line pattern is proposed to predict the plastic resistance more accurately. Moreover, an expression is developed to estimate the ultimate resistance. The averages of actual to predicted ratios of the proposed modifications are 1.05 and 1.03 for the plastic and ultimate capacities, respectively.

对非加强型 T 型桩进行了全面的实验研究，以检查影响 T 型桩能力的参数的影响。根据这个目标，在单调加载下测试了 35 个未加劲的 T 形短柱，直至失效，观察到显着的大变形。T 形短柱的法兰选自 6、8 和 10 毫米的薄板，而螺栓则选择为 27 毫米的大螺栓。通过这种方式，T 形接头的容量受法兰的弯曲容量控制。选择法兰厚度、法兰宽度、T 形柱到螺栓排的距离、边距、螺栓直径和焊缝厚度作为参数。结果表明，带有薄板和大螺栓的未加筋 T 形短柱可以表现出显着的高延展性和承载力。此外，结果表明，AISC 358-16 和 EN1993-1-8 给出的设计建议保守地预测了 T 型短截线的容量。AISC 358-16 和 EC3:1-8 的实际塑性容量与预测塑性容量的平均比率分别为 1.96 和 1.66（方法 2 为 1.34）。对于极限容量，这些比率修改为 8.36 和 7.14（方法 2 为 5.88）。低估的根源在于塑性铰之间的距离。提出了一种新的屈服线模式，以更准确地预测塑性阻力。此外，还开发了一个表达式来估计最终阻力。对于塑料和极限容量，建议修改的实际与预测比率的平均值分别为 1.05 和 1.03。