超高性能混凝土加固钢筋混凝土梁受弯性能研究

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摘要超高性能混凝土（UHPC）由于较高的强度和耐久性可作为理想的加固材料。首先基于已有试验结果，研究了可合理考虑加固层和混凝土梁接触面间粘聚力接触的UHPC加固钢筋混凝土梁精细有限元模型建模方法。在此基础上，建立了162个加固梁的有限元模型进行了数值模拟分析，研究了不同加固筋截面积、加固层厚度以及加固层有无拼缝等关键参数对构件破坏模式和承载力的影响规律。研究结果表明：考虑粘聚力接触的数值模型可以较好的模拟UHPC加固钢筋混凝土梁的受弯性能；加固层厚度与加固筋截面积均会影响试件破坏模式与承载力提升幅度，但对于含拼缝试件，加固层厚度对上述性能影响较小。

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	常跃 1
	黄俊旗 1
	2
	种迅 1
	2
	赵猛 1
	蒋庆 1
	2
	冯玉龙 1
	2

关键词 ：超高性能混凝土（UHPC）, 钢筋混凝土梁, 抗弯性能, 数值模拟

Abstract：Ultra-high performance concrete (UHPC) can be used as an ideal inorganic strengthening material owing to the high strength and improved durability. Based on the existing experimental results, this research proposed a refined finite element modeling method. The proposed method can be used in the numerical simulation of reinforced concrete (RC) beams strengthened with UHPC, and considering the cohesive contact between the reinforcement layer and the concrete beam contact surface. Then, finite element models of 162 reinforced beams were established and numerical simulation analysis were conducted, emphasizing on the influence of key parameters (e.g., such as cross-sectional area of reinforcement bars, thickness of reinforcement layer, and whether the reinforcement layer has joints) on the failure modes and bearing capacity of the components. The results indicated that the numerical model considering cohesive contact behavior could well predict the flexural behavior of RC beams strengthened with UHPC; the thickness of the strengthening layer and the cross-sectional area of the reinforcement bars both influenced the failure mode and the increasing of the load capacity, but for the specimens with joints, the thickness of the strengthening layer presented marginal influence on the behavior mentioned above.

Key words： ultra-high performance concrete (UHPC) RC beam flexural behavior numerical simulation

收稿日期: 2023-05-22 出版日期: 2024-06-15

引用本文:

常跃 1，黄俊旗 1,2，种迅 1,2，赵猛 1，蒋庆 1,2，冯玉龙 1,2. 超高性能混凝土加固钢筋混凝土梁受弯性能研究[J]. 振动与冲击, 2024, 43(11): 288-296.
CHANG Yue1, HUANG Junqi1,2, ZHONG Xun1,2, ZHAO Meng1, JIANG Qing1,2, FENG Yulong1,2. Bending performance of RC beams reinforced with UHPC. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(11): 288-296.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2024/V43/I11/288

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