摘要
为研究钢纤维掺量对桥梁承重结构混凝土力学性能的影响规律,通过正交试验设计考察0%~1.5%体积掺量的端钩型镀铜钢纤维对C50高性能混凝土抗压强度、抗折性能及断裂韧性的调控作用。结果表明:钢纤维掺量与混凝土力学性能呈非线性关系,相较于未掺加钢纤维时,钢纤维掺量1.0%时,抗压强度提升20.6%,抗折极限荷载提升106%,断裂能提升244%,荷载-挠度曲线显示试件韧性指数提升320%,断裂韧性测试揭示其裂缝扩展速率降至0.09 mm/cycle。试验确定钢纤维最优体积掺量为1.0%,可有效平衡纤维桥接效应与团聚风险,为提升桥梁承重结构抗裂性、延展性和抗疲劳性能提供材料优化方案。
In order to study the influence of steel fiber content on the mechanical properties of bridge bearing structure concrete,the effect of 0%~1.5% volume content of end hook copper-plated steel fiber on the compressive strength,flexural properties and fracture toughness of C50 high performance concrete was investigated by orthogonal experimental design.The results indicate that the amount of steel fiber added to concrete exhibits a nonlinear relationship with its mechanical properties.Compared to the case without steel fiber,when 1.0% steel fiber is added,the compressive strength increases by 20.6%,the flexural ultimate load increases by 106%,and the fracture energy increases by 244%.The load-deflection curve shows a 320% increase in the specimen's toughness index,and the fracture toughness test reveals that the crack propagation rate decreases to 0.09 mm/cycle.The optimal volume fraction of steel fiber is 1.0%,which can effectively balance the fiber bridging effect and agglomeration risk,and provide material optimization scheme for improving the crack resistance,ductility and fatigue resistance of bridge bearing structure.
作者
秦绪海
王金虎
孙秀辉
QIN Xuhai;WANG Jinhu;SUN Xiuhui(Heilongjiang Nongken Construction Engineering Road and Bridge Co.,Ltd.,Harbin,Heilongjiang 15000,China;Yanshou County Highway Development Center,Yanshou,Heilongjiang 150700,China;Heilongjiang Transportation Information and Science Research Center,Harbin,Heilongjiang 150080,China)
出处
《黑龙江交通科技》
2025年第5期52-55,共4页
Communications Science and Technology Heilongjiang
关键词
钢纤维
桥梁承重结构
高性能混凝土
抗压强度
抗折性能
断裂韧性
steel fiber
bridge bearing structure
high performance concrete
compressive strength
bending resistance
fracture toughness
