预应力UHPC加固损伤梁抗弯性能参数分析与优化布设研究

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关键词：预应力；超高性能混凝土；混凝土损伤模型；加固技术；抗弯性能；梁体 中图分类号：TU375.1 文献标志码：A 文章编号：1008-0562（2025）02-0202-09 leter analysis and optimized deployment study of flexural performance of prestressed UHPC-reinforced damaged beams

HUANG Ying1 ,WANGLiyuan²

(1.College of Civil Engineering,Fujian Chuanzheng Communications College,Fuzhou 350007, China;2.College of Civil Engineering,Fuzhou University,Fuzhou 35o1o8,China)

Abstract:To optimize the layout of ultra-high-performance concrete (UHPC)reinforcement layer and improve its performance，numerical simulation and experimental comparison methods were used to study the stress performance of damaged RC holow slab beams reinforced with unreinforced UHPC,ordinary reinforced UHPC, and prestressed UHPC under diferent reinforcement states,as well as the influence of reinforcement layer thickness,length,and prestresson thereinforcement efectof the beam.Theresearch resultsshow thatcompared with ordinary reinforced UHPC reinforcement,prestressed UHPC reinforcement can improve the stress state of the beam,effectively restrainthe development ofcracks,greatly improve the bearing capacity and stiffnesof the reinforcedhollow slab beam,and significantlyincrease thecracking load,yield load,and bendingultimate bearing capacity of the beam.The reinforcement protection is more eficient and durable.The changes in parameters such as thicknesslength,and prestress of the reinforcement layer are compared and analyzed,and suggestions for optimizing the reinforcement layer are proposed.The research results can provide reference for thedesign ofUHPC reinforced damaged beams.

Keywords: prestresed; ultra-high-performance concrete;concrete damage model; reinforcement technology; flexural behavior; beam

0 中 引言

《2023年交通运输行业发展统计公报》统计数据显示，截至2023年末，中国公路桥梁共计107.93万座，总长超过 95288.2km ，其中，中小桥梁占比为 82.6% 。（剩余17542字）