• 作者： 方一匡; 洪坤王倉; 吳俊裕
• 作者服務機構： 成功大學土木工程學系
• 中文摘要： 本文旨在以實驗方式探討高強度混凝土方形箍筋柱在無偏心軸壓作用下之強度與韌性行為。本研究共製作40個斷面為250mm × 250mm × 1000mm之高強度混凝土柱，其中24個為具有方形橫箍筋柱，16個為無鋼筋試體。為進行混凝土強度效應之探討，本研究另外再製作5個33 MPa之普通強度混凝土柱以供比對之用。高強度混凝土之抗壓強度介於48.3 MPa至82.7 MPa（7000 psi至12000 psi）。主要考慮之變數為混凝土強度，橫箍筋型式及箍筋間距，藉此探討箍筋行為及其對高強度混凝土柱之圍束效應。 實驗結果顯示箍筋對高強度混凝土柱之強度提昇及延展性改善之效果不若普通強度混凝土柱來得明顯。箍筋及輔助繫筋之應變隨其間距之減小而增加並可拉至降伏應變。本研究並提出一經驗公式以供高強度混凝土箍筋柱之尖峰應力及應力一應變曲線之預測，經與實驗值比較，其預測性尚稱良好。
• 英文摘要： The behavior of high strength concrete (HSC) short columns subjected to uniaxial compressive loadis reported. Forty 250mm × 250mm x 1000mm HSC columns, in which 24 were laterally reinforced, and16 were without reinforcement, were tested. Five additional normal strength concrete columns of the samesize were tested as reference specimens. The compressive strengths of HSC varied from 48.3 MPa to 82.7MPa (7,000 psi to 12,000 psi) The main variables were concrete strength (fc), type of lateral reinforcement,and spacing of ties. The behavior of tie and crosstie as well as the effectiveness of confinement are discussed. Test results revealed that the beneficial effect of lateral reinforcement on strength increase and ductilityimprovement was not so pronounced in the HSC specimens as in the normal strength concrete specimens.The strains of tie and crosstie increased as the spacing of ties decreased and could be stretched to yield valueif smaller spacing was adopted. An empirical equation is proposed to predict the peak stress and the stress-strain curve of confined HSC tied columns. Resonable correlation between the predicted and tested resultsis obtained.
• 中文關鍵字： high strength concrete; column; hoop; crosstie; confinement; reinforced concrete; concrete
• 英文關鍵字： --