為確保鋼管填充混凝土的合成效應，常使用剪力釘做為剪力連接物，但雙直縫BCP 鋼管納入剪力釘施銲時，銲接機具會限制剪力釘的尺寸及位置。本論文提出將鋼板銲於鋼管角隅處的「角隅鋼板」剪力連接物，並完成兩次推出(pushout)試驗了解其受力行為。而試驗分為前導試驗和「角隅鋼板」剪力連接物試驗。前導試驗中測試了6 座具不同型式之剪力連接物試體，結果顯示「角隅鋼板」剪力連接物行為最佳。「角隅鋼板」剪力連接物試驗測試了32 座剪力連接物試體，探討參數包含泌水現象、角隅承壓面積、直接承壓面積、承壓距離及鋼管尺寸等參數。試驗結果顯示：
(1)「角隅鋼板」剪力連接物的強度發展和角隅承壓面積有很好的相關性，本研究根據試驗結果，提出適用在本試驗參數範圍內的強度評估公式，其角隅承壓應力可發揮出大於或等於6.8倍的混凝土抗壓強度；(2)承壓面有泌水現象之試體之早期強度低於承壓面無泌水現象之試體，但極限強度兩者差距不大；(3)剪力釘之長度對早期的強度發展影響很小，但長度較長的剪力釘極限強度較大。

Shear stud is the most common way used to achieve the composite action of concrete filled steel tube. However, due to the manufacturing process of the BCP member, the size and location of the shear studs will be limited. To solve this fabrication problem, a new method to achieve the composite action is introduced, which utilize steel plate welded to corner of the column as shear connectors (corner-plate shear connectors). In order to evaluate the performance of this corner-plate shear connectors, push-out test is conducted. The test is divided into the pilot test and the corner-plate shear connectors test. The pilot test consists of specimens using 6 types of shear connectors and the test results show that the performance of the shear connectors located in corner is the best. Following the pilot test, 32 specimens using corner-plate shear connectors are tested to investigate the influence of the bleeding condition, corner bearing area, plate bearing area, bearing distance and the size of tubes. The following results are obtained: (1) the strength development of the corner-plate shear connectors has a very good relationship with the corner bearing area, a design formula to calculate the average bearing stress in the corner bearing area is proposed and the result shows that the corner bearing stress can be 6.8 times of the compressive strength of the concrete, (2) specimens with bleeding results is slower strength developed than the ones with no bleeding, but the strength of both specimens are similar at ultimate strength, (3) the influence of length of shear studs in the early loading stage is not significant, but at ultimate condition, the strength of longer shear studs is higher.

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