考虑界面黏结滑移的聚丙烯纤维混凝土梁弯剪破坏特征研究  

Research on Bending and Shear Failure of Polypropylene Fiber Reinforced Concrete Beams Considering Interface Bonding and Sliding

作　　者：张君健 王华逸 周明[2] 刘新华[3] 何雄君[2] ZHANG Jun-jian;WANG Hua-yi;ZHOU Ming;LIU Xin-hua;HE Xiong-jun(Hubei Jiaotou E-Xi Expressway Construction Management Co.Ltd.,Wuhan 430051,China;School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430063,China;CCCC Second Highway Consultants Co.Ltd.,Wuhan 430051,China)

机构地区：[1]湖北交投鄂西高速公路建设管理有限公司,武汉市430051 [2]武汉理工大学交通与物流工程学院,武汉市430063 [3]中交第二公路勘察设计研究院有限公司,武汉市430051

出　　处：《公路》2025年第2期105-114,共10页Highway

基　　金：湖北省交通运输厅科技项目,项目编号2022-11-2-8;中央高校基本科研业务费专项资金项目,项目编号2023-VB-009;国家自然科学基金项目,项目编号51178361。

摘　　要：掺加聚丙烯纤维是提高混凝土开裂性能的有效途径之一。基于混凝土塑性损伤模型和内聚力模型考虑聚丙烯纤维增强混凝土(PFRC)和钢筋—混凝土界面的非线性行为,研究PFRC—钢筋梁的抗弯剪性能。建立有限元模型对掺加不同体积比纤维用量的PFRC梁进行了数值分析,通过定义不同的材料模型来描述梁在弯剪作用下的开裂行为。结果表明,聚丙烯纤维能有效提升混凝土抵抗弯剪破坏的能力,采用黏聚力单元模拟界面黏结滑移能更准确地描述梁的开裂特征。研究结果对于理解聚丙烯纤维维对PFRC梁抗弯剪性能的影响具有较高的参考价值。Polypropylene fiber reinforced concrete(PFRC)is considered an effective way to improve the cracking performance of concrete.This study is based on the plastic damage model and cohesion model of concrete,considering the nonlinear relationship between PFRC and the interface between steel and concrete.The bending and shear performance of PFRC-reinforced concrete beams is studied,and finite element validation is conducted on PFRC beams with three fiber volume ratios.The cross-sectional shape and reinforcement ratio of all beams are the same,but the volume ratio of polypropylene fiber(PP)fibers added is different.The cracking behavior of beams under bending and shear is described by defining different material models.The results indicate that polypropylene fibers can effectively enhance the capability of concrete to resist bending and shear failure.Using cohesive units to simulate interface bond slip can more accurately describe the cracking characteristics of beams.The results obtained are of great significance for understanding the impact of polypropylene fibers on the bending and shear resistance of PFRC beams.

关 键 词：桥梁工程 聚丙烯纤维增强混凝土梁 混凝土塑性损伤模型 内聚力模型 数值分析 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]