Ren Zhenhua, Zhang Ke, Wu Chengwang, Zhang Yi, Zeng Xiantao, Ding Xuanming
Hunan Provincial Key Laboratory of Intelligent Disaster Prevention-Mitigation and Ecological Restoration in Civil Engineering, Hunan Institute of Engineering, Xiangtan 411104, China.
College of Civil Engineering, Chongqing University, Chongqing 400045, China.
Materials (Basel). 2025 Jun 26;18(13):3024. doi: 10.3390/ma18133024.
China has a vast number of infrastructure projects, with concrete structures accounting for the majority. To achieve the rapid and effective reinforcement and renovation of existing engineering structures, this paper proposes a novel approach for the rapid strengthening of concrete beams: an external prestressed reinforcement method applied to the side facade. To investigate the effectiveness of this new reinforcement method, we used three ordinary concrete beams serving as control specimens without prestress application, nine beams reinforced using traditional external prestressing, and nine beams reinforced with external prestressing applied to the side facade. The results indicated that, in comparison to the control beam and depending on the initial prestress level, the ultimate bearing capacity of the concrete beams reinforced with traditional external prestressing increased by 152% to 155%. Additionally, for the concrete beams reinforced with external prestressing on the side face, the ultimate bearing capacity improved by 53% to 61%. Both the cracking load and yield load of the reinforced concrete significantly increased, thereby enhancing the overall working performance. Based on the finite element simulation results, it can be observed that the simulation calculation outcomes aligned closely with the experimental test results.
中国有大量的基础设施项目，其中混凝土结构占大多数。为实现对既有工程结构的快速有效加固与修复，本文提出一种混凝土梁快速加固的新方法：在侧面采用体外预应力加固法。为研究这种新型加固方法的有效性，我们使用了三根未施加预应力的普通混凝土梁作为对照试件，九根采用传统体外预应力加固的梁，以及九根在侧面施加体外预应力加固的梁。结果表明，与对照梁相比，取决于初始预应力水平，采用传统体外预应力加固的混凝土梁的极限承载力提高了152%至155%。此外，对于在侧面施加体外预应力加固的混凝土梁，极限承载力提高了53%至61%。钢筋混凝土的开裂荷载和屈服荷载均显著增加，从而提高了整体工作性能。基于有限元模拟结果可以看出，模拟计算结果与试验测试结果吻合良好。
