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首页> 外文期刊>Advances in civil engineering >Experiment on the Segment Model of a Plain Concrete Arch Bridge Reinforced with UHPC Composite Arch Circle
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Experiment on the Segment Model of a Plain Concrete Arch Bridge Reinforced with UHPC Composite Arch Circle

机译：用UHPC复合拱圈加固普通混凝土拱桥段模型的实验

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This research aims to investigate the efficiency of strengthening of plain concrete (PLC) arches using UHPC. Thirteen segment arch models reinforced using normal concrete (NC, group N) or ultra-high performance concrete (UHPC, group U) were tested in this study. The failure mode, strain distribution, and calculation of bearing capacity of PLC arch bridges reinforced with UHPC arch circle were analyzed. The experimental results showed that the technology of chiseling and planting bars could provide sufficient bond strength on the interface between the UHPC reinforcement layer and NC substrate. Both groups showed one or two failure modes of the concrete crushing of the original structure and the interface failure. However, no cracks appeared in the UHPC reinforcement layer, indicating that there was still large bearing potential. The strain distribution of the whole section in group N was consistent with the plane section assumption. But, this phenomenon was not observed in group U since the strain of the reinforcement layer was ahead (R-side loading) or behind (L-side loading) that of original structures. A simplified calculation formula was used for calculating the bearing capacity of group U. It was accurate for specimens loaded on the L-side, and an enhancement coefficient of 0.15 should be considered for R-side loading specimens.
机译：该研究旨在探讨使用UHPC加强普通混凝土（PLC）拱的效率。在本研究中测试了使用普通混凝土（NC，NC）或超高性能混凝土（UHPC，GROUP U）加强的十三段拱模型。分析了用UHPC拱圈加强的PLC拱桥承载能力的故障模式，应变分布和计算。实验结果表明，凿子和种植棒的技术可以在UHPC加强层和NC衬底之间的界面上提供足够的粘合强度。两组均显示了原始结构和界面故障的混凝土压碎的一项或两种故障模式。然而，UHPC加强层中没有出现裂缝，表明仍然存在大的轴承电位。 N组中整个部分的应变分布与平面部分的假设一致。但是，由于增强层的菌株前方（R侧装载）或原始结构的后面（L侧负载），因此在U中未观察到这种现象。简化的计算公式用于计算u的轴承能力。它准确地用于L侧的样品，应考虑R侧负载试样的0.15的增强系数。

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