单向分布钢纤维RPC弯曲性能试验
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1.温州大学;2.台州学院

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浙江省教育厅一般项目(Y201942336)


Experimental study on flexural behavior of Aligned Steel Fiber RPC
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Affiliation:

1.Wenzhou University;2.Taizhou University

Fund Project:

General project of Zhejiang Education Department (No. Y201942336)

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    摘要:

    为研究准静态荷载下纤维分布对构件力学性能的影响,对同一纤维掺量(2%)下不同纤维长度(13mm~20mm)的单向分布和乱向分布钢纤维RPC试件开展了四点受弯试验。通过选取弯拉荷载-挠度曲线上初裂点、峰值点及其他几个特征点,定量地分析单向分布和乱向分布钢纤维RPC的弯拉性能。试验结果表明:钢纤维在主拉应力方向上的方向系数显著影响基体的弯曲性能。其中,单向分布钢纤维试件的弯拉峰值应力、弯曲韧性较乱向分布试件均有大幅提高,且跨中挠度达到L/150时,前者的残余强度仍高于初裂强度4.35MPa~16.9MPa;纤维长度由13mm增加至20mm时,与乱向分布试件相比,单向分布试件的裂后弯曲性能提高幅度更明显,且单向分布试件受荷越大,纤维长径比的优势越能体现出来;单向分布试件断口处纤维分布均匀,绝大部分方向与主裂纹方向垂直,锚固长度大,断口处桥接效应显著;综合考虑单向钢纤维RPC试件的等效弯曲应力,耗能能力等指标,当纤维掺量为2%的前提下,纤维长度为20mm时,其力学性能最优。

    Abstract:

    Abstract: To study the influence of fiber distribution on the mechanical properties of Reactive Power Concrete(RPC) members under quasi-static loading, the four-point bending test was carried out on RPC specimens at the same fiber content (2%) and different fiber lengths (13mm~20mm). By selecting the initial crack point, peak point and other characteristic points on the bending load deflection curves, the bending properties of aligned steel fiber RPC(ASFRPC) and steel fiber RPC(SFRPC) were analyzed quantitatively. The experimental results follow: Orientation coefficient of steel fibers has a strong impact on the deflection hardening behavior in bending. First of all, the bending tensile peak stress of ASFRPC is greater than that of SFRPC. In particular, when the mid-span deflection reaches L/150, the residual strength of ASFRPC specimen is still 4.35 MPa~6.9MPa higher than that of the initial crack strength. Secondly, when the fiber length increases from 13mm to 20mm, the flexural property of ASFRPC specimen improves more significantly than that of SFRPC specimen, and the load of the aligned distributed steel fiber specimen is also greater. Thirdly, the fiber distribution of ASFRPC is uniform at the fracture, most of which are perpendicular to the main crack direction. Besides, the anchorage length is also long, and the bridging effect is significant at the fracture. In conclusion, considering the equivalent bending stress and energy absorption capacity of ASFRPC specimens, the mechanical properties of aligned steel fiber specimens perform best when the fiber content is 2% and the fiber length is 20mm. Keywords: aligned steel fiber; Reactive Powder Concrete; fiber length; the equivalent bending stress; toughness

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  • 收稿日期:2020-08-31
  • 最后修改日期:2020-11-11
  • 录用日期:2020-11-23
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