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李学军

 

(湖南高速养护工程有限公司 , 长沙   410206)

摘  要: 为了增强桥梁结构的加固效果 , 延长桥梁结构的使用寿命 。以镀铜钢纤维 、聚乙烯醇纤维和玄武岩纤维作为复合纤维 , 研究了复合纤维掺量对混凝土基本力学以及阻裂性能的影响 , 优选出合适的复合纤维掺量 , 并考察了复合纤维混凝土作为加固材料对桥梁结构的加固效果 。结果表明 : 合适掺量的复合纤维能够显著改善混凝土的基本力学性能和阻裂性能 , 推荐复合纤维的最佳掺量为 0. 6%。复合纤维混凝土加固后的 T 梁在施加载荷过程中 , 载荷-挠度曲线的峰值显著增大 , 并且在相同的载荷和测试位置条件下 , 使用复合纤维混凝土加固后的 T 梁底部钢筋应变明显小于使用普通混凝土加固 。复合纤维混凝土作为加固材料能够有效提高目标桥梁结构的抗弯拉性能和极限载荷 , 起到了良好的加固效果。

关键词: 复合纤维 ; 混凝土桥梁架构 ; 力学性能 ; 阻裂性能 ; 加固性能

中图分类号: U445. 72      文献标志码: A      文章编号: 1005-8249 (2026) 05-0134-05

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 05. 020

 

LI Xuejun

(Hunan Expressway Maintenance Engineering Co. , Ltd. , Changsha 410206, China)

Abstract : In order to enhance the reinforcement effect of bridge structures and extend their service life.  The influence of composite fiber content on the basic mechanics and crack resistance of concrete was studied using copper plated steel fibers, polyvinyl alcohol fibers, and basalt fibers as composite fibers.  The appropriate composite fiber content was selected, and the reinforcement effect of composite fiber concrete as a reinforcement material on bridge structures was investigated.  The results show that the appropriate dosage of composite fibers can significantly improve the basic mechanical properties and crack resistance of concrete. The recommended optimal dosage of composite fibers is 0. 6%.  The peak value of the load deflection curve of the T-beam reinforced with composite fiber reinforced concrete significantly increases during the application of load, and under the same load and test position conditions, the strain of the steel bars at the bottom of the T -beam reinforced with composite fiber reinforced concrete is significantly lower than that reinforced with ordinary concrete.  Composite fiber reinforced concrete as a reinforcement material can effectively improve the bending and tensile resistance and ultimate load capacity of the target bridge structure, playing a good reinforcement effect.

Key  words: composite  fibers;  concrete  bridge  structure;  mechanical  properties;  crack  resistance  performance; reinforcement performance

    

作者简介 : 李学军 (1973—) , 男, 本科, 高级工程师, 研究方向 : 高速公路工程养护施工。

收稿日期 : 2025-08-25