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波形腹板钢纤维PEC柱界面黏结滑移性能试验研究
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Experimental Study on Interface Bond-slip Properties of Corrugated Web Steel Fiber PEC Column
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    PEC柱具有稳定性好、预制化程度高的优点,在其中加入钢纤维可有效抑制混凝土裂纹的发展. 以锚固长度和钢纤维掺量为变量,设计了8个波形腹板钢纤维PEC柱试件并进行推出试验,研究了其界面黏结滑移性能. 结果表明:钢纤维混凝土试件在荷载下降段界面裂纹贯通,试件破坏模式均为界面自然黏结力失效破坏;当钢纤维掺量一定、锚固长度为650 mm时,界面黏结性能最佳;在混凝土中加入钢纤维可提升黏结性能,随着钢纤维掺量增大,初始滑移荷载与初始强度随之增大,极限荷载先减后增,当钢纤维掺量为1.5%时,极限强度达到最小值而残余强度达到最大值;钢板翼缘应变在荷载上升段随锚固长度近似呈指数分布,波形腹板应变呈波浪形;通过线性回归拟合得出试件特征黏结强度的计算式,将计算值与试验值对比,发现误差较小,可为波形腹板钢纤维PEC柱的承载力设计及应用提供参考.

    Abstract:

    Partially Encased Composite (PEC) columns offer the advantages of good stability and high precast degree. Adding steel fibers into the concrete mix can effectively restrain the development of concrete cracks. In this paper, eight steel fiber-reinforced PEC column specimens with corrugated web were designed and tested, with the anchorage length and steel fiber content as variables. The bond-slip behavior at the interface was studied. The results show that the steel fiber-reinforced concrete specimens are broken through the interface cracks in the load decreasing section, and the failure mode of the specimens is the natural bonding force failure at the interface. The interface bond performance is the best when the steel fiber content is constant and the anchoring length is 650 mm. Adding steel fiber into the concrete can improve the bond properties. With the increase of steel fiber content, the initial slip load and initial strength increase, and the ultimate load first decreases and then increases. When the steel fiber content is 1.5%, the ultimate strength reaches the minimum value and the residual strength reaches the maximum value. The strain of the flange of the steel plate is approximately exponential with the anchorage length in the load rising section, and the strain of the corrugated web is wavy. A calculation formula of the specimen’s characteristic bond strength was obtained by linear regression fitting. Comparing the calculated value with the test value, it was found that the error was small, which could provide a reference for the bearing capacity design and application of the corrugated web steel fiber PEC column.

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王威 ?,唐家璇 ,李昱 ,柳国良 ,唐新耀 ,邱程宣 ,钱源明.波形腹板钢纤维PEC柱界面黏结滑移性能试验研究[J].湖南大学学报:自然科学版,2025,52(9):91~102

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  • 在线发布日期: 2025-10-09
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