本實驗主要針對非韌性梁柱內接頭在未受到任何損傷前，採用普通強度混凝土擴柱補強之，藉由擴柱補強後分析其所增加之接頭剪力強度，以及探討擴柱補強後之現象如橫向梁所造成之影響、新舊混凝土不一致產生介面滑移之影響、強度及勁度之提昇優劣比較、並且驗證現今評估接頭剪力強度模式的準確性。
本實驗以內接頭為探討對象，一支原型試體及三支RC擴柱補強試體。其中原型試體及一支擴柱補強試體設計成接頭剪力破壞型式，另一支擴柱補強試體之接頭兩側有橫向梁圍束，最後一支擴柱補強試體設計成“恰好”梁撓曲破壞形式。實驗結果顯示，非韌性梁柱內接頭經由混凝土擴柱補強後，其剪力強度、勁度皆有效提升，而橫向梁對於新舊混凝土剝離滑移是有遏止的功效，並且會增加接頭剪力強度，以及減緩接頭破壞後強度的衰減速率。以現行之評估方式，Hakuto剪力衰減模式較適合用來分析原型試體，對於擴柱試體有高估之情形。

The purpose of this study is to observe the results for concrete jacketing with the general strength concrete for non-ductile interior beam-column joints. In the study, the increased joint shear, the influence of stub, the bond slip between new and old concrete interface, and stiffness enhancement were discussed. Meanwhile, the accuracy of the current assessment of joint shear models is verified.
The test is based on interior beam-column joints. The specimens comprise one prototype interior beam-column joint and three retrofitted specimens with RC jacketing. Prototype and one RC jacketing specimens were designed to joint shear failure, one was confined by two side beam stubs for simulating the interior joints with beams in two sides, and the other RC jacketing specimen was designed to “just” beam flexural failure. From the test results, it was found that the retrofitted specimens are superior to the benchmark specimens in strength, stiffness. The beam stubs can prohibit the bond slip between new and old concrete interface and slow down the behavior of shear degradation. It is suitable to analyze the prototype specimen by means of the Hakuto shear degradation model. However the shear degradation model overestimated the joint shear for RC jacketing specimens.

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