特殊抗彎矩構架（SMRF）系統當中，對於採用組合型鋼梁而言，AISC 358-16規範中規定在高應力區（Protected Area）範圍內，組合銲道須為全滲透槽銲道型式。但過去國內多數的梁柱接頭試驗報告，大多採用組合型鋼梁且高應力區並非採用全滲透槽銲道，但仍滿足所需之韌性。為了瞭解組合型鋼梁在高應力區內採用全滲透銲道的必要性，而提出3個可行性較高的組合銲道與全滲透銲道做比較，包括「具最小根面之部分滲透槽銲道及補強填角銲道組合」、「以腹板發揮全拉力為設計力之填角銲道」、「以腹板發揮全剪力為設計力之填角銲道」。除此之外，還包括2種組合型鋼梁斷面及2種韌性切削型式。總共規劃了16組大尺寸梁–柱子結構試體，並以反復載重進行試驗。為了對梁有更嚴格的測試，將梁剪力比定在0.5～0.6左右。根據試驗結果可歸納出：（1）剪力比為0.54以下之梁，高應力區組合銲道以腹板發揮全剪力為設計力之填角銲道即可；剪力比為0.61以下之梁，高應力區組合銲道應至少採用「腹板發揮全拉力為設計力之填角銲道」；（2）切削型式對組合銲道的需求影響有限；（3）腹板厚度與翼板厚度之比值小於43%時，銲道設計可能偏不保守；（4）以承壓型接合設計腹板螺栓，在梁發展出足夠韌性前，沒有破壞或不良的行為發生；（5）組合銲道耗盡其縱向延展性而產生橫向裂縫，但是仍然可以維持腹板與翼板之一體性。

In the special bending moment frame (SMRF) system, for the built-up H-shaped steel beams, the AISC 358-16 specification specifies that in the protected area, the T joint welds shall be the complete joint penetration (CJP) welds. However, in the past, most of the beam-column joint test reports mostly use built-up steel beams and the protected area is not used CJP welds, but still meets the required toughness. In order to understand the necessity of using CJP welds bead in the protected area of the built-up steel beam, three feasible T joint welds are compared with the CJP welds, including "partial joint penetration welds with minimum root surface and the combination of the reinforcing fillet", "the fillet welds with the full tensile force as the design force" and the "fillet welds with the full shear force of the web as the design force ". In addition, there are two types of sections and two types of ductile cutting types. A total of 16 large-size beam-column structural specimens were planned and tested with cycle loads. In order to have a more rigorous test on the beam, the beam shear ratio is set at about 0.5 to 0.6. According to the test results, it can be concluded that: (1) The beam with a shear ratio of 0.54 or less, the T joint welds of the protected area can be used as the fillet weld with the full shear force as the design force; the beam with shear ratio is less than 0.61. For beams in the protected area, the T joint welds should be at least “filled bead with full tensile force as design force”. (2) The influence of cutting type on the demand of T joint welds is limited. (3) When the ratio of the thickness of web and flange is less than 43%, the design may not be conservative. (4) Design the web bolt with pressure-bearing, no damage or bad behavior occurs before the beam develops sufficient toughness. (5) The T joint welds deplete its longitudinal ductility to create a transverse crack, but still maintains the web and the flange.

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