Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/15093
標題: 含高拉力剪力筋混凝土柱之動態撓曲行為
Flexural behavior of reinforced concrete columns with high strength shear reinforcment under cyclic loading
作者: 孫文昌
關鍵字: High Strength Shear Reinforcement;高拉力剪力筋;Column;Cyclic;Flexure;柱;動態;撓曲
出版社: 土木工程學系
摘要: 
本研究主要在探討高拉力剪力筋為橫向箍筋之柱試體同時受固定軸力及動態反覆橫力作用下之撓曲行為,分別在低軸力(平衡點以下)及高軸力(平衡點以上)各製作七支柱試體,共計製作十四支柱試體,其中以三種不同標稱降伏強度分別為235.4MPa(SD24)、274.6MPa(SD28)及490.4MPa(SD50)之#3竹節鋼筋作為剪力筋。試體尺寸為300mm×300mm×4500mm。實驗變數為混凝土強度、軸力、橫向剪力筋強度,所有試體皆設計為撓曲破壞。
試驗結果可歸納如下:
1.ACI規範對於柱件極限撓曲強度預估保守,尤其是對於低混凝土強度以及承受高軸力的作用。
2.在低軸力的作用下,降低混凝土強度可使柱件的延展性提高,且在強度與勁度折減的情況較為緩慢。
3.承受較高軸力的作用下,明顯在延展性、強度與勁度的折減與能量消散的能力上,均比承受低軸力的柱試體 表現差。
4.使用與傳統橫箍筋相同ρs之高降伏強度(4200kgf/cm2以上)橫向箍筋的柱試體,實有助於提高其延展性, 對於強度與勁度亦有穩定的折減,在功損失指數方面也大有提升。唯依現行規範(ACI 318-95),使用高降 伏強度之橫向箍筋會造成過大的間距,導致主筋過早挫曲,柱件提早破壞,因此在提高箍筋強度之際,主筋 挫曲的抑制亦是一重要環節。

The purpose of this study is to investigate the flexural behavior of reinforced concrete columns with high strength shear reinforcement under cyclic lateral load. A total of fourteen column specimens were made in this study. The size of specimens was 300mm×300mm×4500mm . The variables included were concrete strength、level of axial load 、 strength of transverse reinforcement and volume of transverse reinforcement .
The results showed that ultimate strengths predicted by ACI Code were conservative. Columns under higher axial load exhibited less strength﹐ductility﹐stiffness and capability of energy dissipation .With same amount of transverse reinforcement , columns contained high strength shear reinforcement showed better ductility . When designed by ACI 318-95 equation (21-4), due to larger spacing , columns with high strength shear reinforcement showed less ductility in this study.
URI: http://hdl.handle.net/11455/15093
Appears in Collections:土木工程學系所

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