Fracture Behavior of Crack-Damaged Concrete Beams Reinforced with Ultra-High-Performance Concrete Layers

被引:0
|
作者
Guo, Zenghui [1 ]
Tao, Xuejun [2 ]
Xiao, Zhengwei [1 ]
Chen, Hui [1 ]
Li, Xixi [2 ]
Luo, Jianlin [2 ]
机构
[1] Sinohydro Bur 5 Co Ltd, Chengdu 610061, Peoples R China
[2] Qingdao Univ Technol, Marine Environm Concrete Technol Engn Res Ctr, Sch Civil Engn, Minist Educ, Qingdao 266520, Peoples R China
来源
JOURNAL OF COMPOSITES SCIENCE | 2024年 / 8卷 / 09期
关键词
crack-damaged concrete beam; extended finite element method; ultra-high-performance concrete composite; reinforcement layer; fracture behavior; stress intensity factor; FLEXURAL BEHAVIOR; COMPOSITE; UHPC;
D O I
10.3390/jcs8090355
中图分类号
TB33 [复合材料];
学科分类号
摘要
Reinforcing crack-damaged concrete structures with ultra-high-performance concrete (UHPC) proves to be more time-, labor-, and cost-efficient than demolishing and rebuilding under the dual-carbon strategy. In this study, the extended finite element method (XFEM) in ABAQUS was first employed to develop a numerical model of UHPC-reinforced single-notched concrete (U+SNC) beams, analyze their crack extension behavior, and obtain the parameters necessary for calculating fracture toughness. Subsequently, the fracture toughness and instability toughness of U+SNC were calculated using the improved double K fracture criterion. The effects of varying crack height ratios (a/h) of SNC, layer thicknesses (d) of UHPC reinforcement, and fiber contents in UHPC (VSF) on the fracture properties of U+SNC beams were comprehensively investigated. The results indicate that (1) the UHPC reinforcement layer significantly enhances the load-carrying capacity and crack resistance of the U+SNC beams. Crack extension in the reinforced beams occurs more slowly than in the unreinforced beams; |(2) the fracture performance of the U+BNC beams increases exponentially with d. Considering both the reinforcement effect benefit and beam deadweight, the optimal cost-effective performance is achieved when d is 20 mm; (3) with constant d, increasing a/h favors the reinforcement effect of UHPC on the beams; (4) as VSF increases, the crack extension stage in the U+BNC beam becomes more gradual, with higher toughness and flexural properties; therefore, the best mechanical properties are achieved at a VSF of 3%.
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页数:17
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