擴柱補強對非韌性鋼筋混凝土梁柱內接頭抗剪提昇之研究; Investigation of Shear Enhancement of Non-ductile Interior Beam-Column Joints Retrofitted by Concrete Jacketing

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题名:	擴柱補強對非韌性鋼筋混凝土梁柱內接頭抗剪提昇之研究;Investigation of Shear Enhancement of Non-ductile Interior Beam-Column Joints Retrofitted by Concrete Jacketing
作者:	郭瑞宗;Ruei-Tzung Guo
贡献者:	土木工程研究所
关键词:	混凝土擴柱補強;補強;梁柱接頭;接頭剪力;Beam-Column Joints;Joint Shear;RC Jacketing;Retrofit
日期:	2004-11-16
上传时间:	2009-09-18 17:15:03 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	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軸力所造成之影響、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擴柱補強試體均設計成接頭剪力破壞型式，其中原型及一支補強試體有垂直軸力考量。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，而軸力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。以現行之評估方式剪力衰減模式與軟化壓拉桿評估模式皆是適合用來分析原型試體或補強試體，但剪力衰減模式對於擴柱有加載軸力之試體有高估之情形。 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 before damage. In comparison with the increased joint shear, and axial load, the bond slip between new and old concrete interface, strength and effect of stiffness. Finally, the accuracy of the current assessment of joint shear models is evaluated. 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 of RC jacketing joints have axial load. All of the specimens were designed to joint shear failure. From the test results, it was found that the retrofitted specimens are superior to the benchmark specimens in strength, stiffness. The axial load can prohibit the bond slip between new and old concrete interface and increase the joint shear. It is suitable to analyze the prototype or RC jacketing specimens by means of the current assessment of joint shear models(shear degradation model and softened strut-and-tie model). However shear degradation model overestimated the joint shear for RC jacketing specimens with axial load.
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