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Numerical modeling for damaged reinforced concrete slab strengthened by ultra-high performance concrete (UHPC) layer

机译：超高性能混凝土（UHPC）层加固受损钢筋混凝土板的数值模型

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摘要

Ultra-high performance concrete (UHPC) has been developed as an innovative cementitious based material. It can be used for repairing and strengthening existing reinforced concrete (RC) structures because of its excellent mechanical performance, such as high tensile and compressive strengths, long-term durability, and low permeability. However, when using UHPC to strengthen existing RC structures for flexure members, there is limited information on simulating existed cracks in RC structures and considering interface modeling between RC substrate and UHPC overlay. This research developed a finite element (FE) model to investigate flexural behaviors of UHPC-RC composite slab with introducing existed cracks in RC substrate by geometry discontinuous, approximately matched with experimental results previously published by the authors. Meanwhile, based on recent research on the bond strength of UHPC to concrete, a UHPC-RC interfacial model was included in the FE model. The FE model was validated with experimental laboratory results previously published by the authors, and a good agreement was obtained between numerical and experimental results. Finally, a parameter study was conducted to investigate the strengthening effects and optimizing strengthening parameters by using the developed FE model. Results showed that the effect of existing cracks on the ultimate flexure capacity of UHPC-RC cannot be neglected, and the interface model has a precise accuracy in FE modeling.
机译：超高性能混凝土（UHPC）已开发为一种创新的水泥基材料。它具有出色的机械性能，例如高抗拉强度和抗压强度，长期耐用性和低渗透性，可用于修复和加固现有的钢筋混凝土（RC）结构。然而，当使用UHPC来加强现有的挠性构件的RC结构时，关于模拟RC结构中存在的裂缝以及考虑RC基板与UHPC覆盖层之间的界面建模的信息有限。这项研究开发了一个有限元（FE）模型，以研究UHPC-RC复合板的弯曲行为，并通过不连续的几何形状在RC基底中引入了已存在的裂缝，与作者先前发表的实验结果大致相符。同时，基于对UHPC与混凝土粘结强度的最新研究，FE模型中包括了UHPC-RC界面模型。作者先前发表的实验实验室结果验证了有限元模型，并且在数值和实验结果之间取得了良好的一致性。最后，通过建立的有限元模型进行参数研究，以研究加固效果并优化加固参数。结果表明，现有裂纹对UHPC-RC极限抗弯承载力的影响不容忽视，界面模型在有限元建模中具有精确的精度。

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  • 来源
    《Engineering Structures》 |2020年第15期|110031.1-110031.13|共13页
  • 作者

  • 作者单位

    Hunan Univ Coll Civil Engn Key Lab Wind & Bridge Engn Hunan Prov Changsha 410082 Hunan Peoples R China|Missouri Univ Sci & Technol Civil Architectural & Environm Engn Rolla MO 65401 USA;

    Hunan Univ Coll Civil Engn Key Lab Wind & Bridge Engn Hunan Prov Changsha 410082 Hunan Peoples R China;

    Ohio Univ Stocker Ctr 102 Dept Civil Engn Athens OH 45701 USA;

    Missouri Univ Sci & Technol Civil Architectural & Environm Engn Rolla MO 65401 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ultra-high performance concrete; UHPC; Reinforced concrete slab; Strengthen; Cracks; Interface model; Finite element model;

    机译：超高性能混凝土;UHPC;钢筋混凝土板;加强;裂缝;接口模型;有限元模型;

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