Feng Fan, Zuanfeng Pan, Hongcai Pan
School of Civil Engineering, Tongji University, Shanghai, 200092, China.
Keyi College, Zhejiang Sci-Tech University, Shaoxing, 312369, China.
Sci Rep. 2025 Jul 2;15(1):23146. doi: 10.1038/s41598-025-03218-x.
Ultra High Performance Concrete (UHPC) has the advantages of high strength and good durability. The new technology of unbonded prestressed UHPC to strengthen ordinary concrete beams can give full play to the performance of prestressed "high efficiency" and UHPC "light durability". In this paper, through the test and theoretical analysis of 10 unbonded prestressed UHPC reinforced beams, the bearing capacity of prestressed UHPC reinforced beams and the key parameters affecting the flexural performance (i.e., UHPC strength, thickness, prestressed tensile degree and prestressed reinforcement ratio) are studied. The test results show that: UHPC and concrete beam using chisel processing technology, unbonded prestressed by end anchorage can achieve effective interface bonding while ensure the reinforcement effect with a simple construction process; Prestressed UHPC reinforced beams can greatly improve the cracking performance, flexural bearing capacity and rigidity; Through theoretical research, the formula of flexural bearing capacity of ordinary concrete beams reinforced by prestressed UHPC is deduced, which is conducive to subsequent engineering application.
超高性能混凝土（UHPC）具有强度高、耐久性好的优点。无粘结预应力UHPC加固普通混凝土梁的新技术能够充分发挥预应力“高效”和UHPC“轻质耐久”的性能。本文通过对10根无粘结预应力UHPC加固梁进行试验和理论分析，研究了预应力UHPC加固梁的承载力以及影响抗弯性能的关键参数（即UHPC强度、厚度、预应力张拉程度和预应力配筋率）。试验结果表明：采用凿毛处理工艺的UHPC与混凝土梁，通过端部锚固进行无粘结预应力，能实现有效的界面粘结，同时施工工艺简单且能保证加固效果；预应力UHPC加固梁能大幅提高开裂性能、抗弯承载力和刚度；通过理论研究，推导了预应力UHPC加固普通混凝土梁的抗弯承载力公式，有利于后续工程应用。
