創新壓－拉桿模型與直接拉伸試驗對超高性能混凝土拉伸特性之試驗分析

CHARACTERIZATION OF THE TENSILE PROPERTIES OF ULTRA-HIGH PERFORMANCE CONCRETE UTILIZING THE INNOVATIVE STRUT-AND-TIE MODEL AND DIRECT TENSILE TEST

10.6652/JoCICHE.202203_34(1).0001

賴怡君(Yi-Chun Lai)；李明輝(Ming-Hui Lee)；戴毓修(Yuh-Shiou Tai)

超高性能混凝土 ； 鋼纖維 ； 拉伸性能 ； 壓拉桿模型 ； ultra-high performance concrete ； tensile properties ； steel fiber ； strut-and-tie model

中國土木水利工程學刊

34卷1期（2022 / 03 / 01）

1 - 10

繁體中文

超高性能混凝土（ultra-high performance concrete, UHPC）是一種新興的混凝土材料。除了具有超過150 MPa的抗壓強度與出色的耐久性，其添加鋼纖維之後的拉伸性能和彎曲強度亦受到矚目。本研究採用創新之壓－拉桿拉伸試驗與直接拉伸試驗獲得UHPC在不同鋼纖維強化下的應力－應變行為，實驗結果顯示，兩種試驗方法在控制良好的條件下均能呈現應變硬化特徵。同時，試驗可獲得穩定且一致性之實驗數據。在UHPC的性質方面，本研究設計了三種不同鋼纖維含量之UHPC，除了比較試驗方法的差異之外，也探討鋼纖維體積比對UHPC拉伸性質，如初始開裂強度、峰值強度、應變能力與消能性質的影響。

Ultra-high performance concrete (UHPC) is an emerging concrete material. In addition to its compressive strength of more than 150 MPa and excellent durability, its tensile properties, and flexural strength after adding steel fibers have also attracted attention. In order to obtain the characteristic of tensile mechanical behavior, this study uses innovative strut-and-tie model and direct tensile tests to obtain the stress-strain behavior of UHPC under different steel fiber reinforcements. The experimental results show that both test schemes can exhibit strain hardening features under well-controlled conditions. At the same time, both test schemes can obtain stable and consistent results. In terms of the properties of UHPC, this study designed three UHPCs with different steel fiber volume fractions, in addition to comparing the differences in test methods, the effect of steel fiber volume ratio on UHPC tensile properties, such as initial cracking strength, post-peak strength, strain capacity, and The influence of energy-absorbing properties.

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