現今結構物，因應許多特殊用途，常會有細長柱設計之需求。而細長柱受壓時，會引發細長效應，產生額外之側向變形，影響柱的穩定性和強度折減。而超高性能纖維混凝土(Ultra High Performance Fiber Reinforced Concrete，UHPFRC)可以有效縮小構件尺寸，且因於混凝土中添加鋼纖維，鋼纖維具有橋聯效應之特性，可有效在主要裂縫開裂之前，吸收變形之能量，轉換為多重均勻之細微裂縫之破壞模式，強化結構物之能力。因此本文研究利用此新型混凝土，製作十支超高性能纖維混凝土(UHPFRC)與九支超高性能混凝土(UHPC)細長柱，以兩端鉸接，無側向位移，施加無偏心或偏心軸壓，對兩種不同縱向鋼筋體積比、三種不同橫向鋼筋比與兩種不同鋼纖維體積比，探討使用鋼纖維是否可以增強柱之圍束能力、降低橫向鋼筋比，放大箍筋間距，與取代繫筋。由實驗結果得知，超高性能纖維混凝土(UHPFRC)細長柱，不僅具有良好之力學性能，同時具有優越的損壞容忍力。添加1.5%體積比鋼纖維，可允許細長柱在箍筋間距d/4下，取代雙向繫筋，而若在配置雙向繫筋下，可允許放大箍筋間距至d/2。

Today's structures are designed for many special applications with slender columns.When the slender column is subjected to axial forces, there will be slender effect, resulting in additional lateral deformation.And the slender effect affects the stability and strength of the column. Ultra-high performance fiber reinforced concrete(UHPFRC) can effectively reduce the cross-section of the column.And because of the addition of steel fiber in concrete, steel fiber has the characteristics of bridging effect.Steel fiber can effectively absorb the deformation of the energy, before the major cracks and makeing the failure mode into a multiple uniform fine crack, to strengthen the structure of the ability. Therefore, this study produced 10 ultra-high performance fiber reinforced concrete(UHPFRC) slender columns and 9 ultra-high performance concrete(UHPC)slender columns. The Specimen is hinged at both ends without sway and applied concentrical and eccentrical loading. For the two different longitudinal reinforcement ratio,three different transverse reinforcement ratio and two different steel fiber volume ratio, to explore whether using of steel fiber can enhance the capacity of the confinement, to reduce the lateral reinforcement ratio、increases the spacing of hoop and instead of crosstie. From the experimental results, it is known that ultra-high performance fiber reinforced concrete (UHPFRC) slender columns not only have good mechanical properties, but also have excellent damage tolerance. The addition of 1.5% by volume of steel fiber allows the slender columns to replace the tie under the spacing of hoop is d/4, and under the biaxial crosstie, the hoop of spacing can be allowed to d/2.

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