摘要
为进一步将高强钢绞线网增强工程水泥基复合材料推广应用于既有工程结构加固,本文进行了该复合材料加固损伤梁抗弯性能试验研究。考虑原梁损伤程度、高强钢绞线直径、高强钢绞线配筋率的影响,对1个对比梁和7个卸载加固损伤梁进行抗弯性能试验。结果表明:采用该加固方法,可使加固层与原梁较好地协同工作,充分发挥高强钢绞线网增强工程水泥基复合材料的优越力学性能,从而可显著提升卸载加固损伤梁的承载力、刚度、延性、韧性以及抗裂性,明显减小裂缝宽度;相比于加固无损梁,随着损伤程度的增加,卸载加固损伤梁的受弯承载力、截面刚度、延性以及韧性均呈降低趋势,且加固层对混凝土裂缝的控制能力亦降低;适当增加纵向钢绞线配筋率,可提高加固损伤梁受弯承载力、截面刚度、延性、韧性及加固层对裂缝的约束能力;纵向钢绞线配筋率相近时,钢绞线直径越小,加固层的控裂能力越强,能更好地减小裂缝宽度。
To further apply cement-based composites reinforced by high-strength steel strand meshes to the ment reinforce-of existing engineering structures,the bending performance of composite materials in reinforcing damaged beams was studied.Considering the influence of the damage degree of the original beam,the diameter of the high-strength steel strand,and the reinforcement ratio of the high-strength steel strand,bending performance tests of one beam for comparison and seven unloading reinforced damaged beams were conducted.The results show that the reinforcement layer and the original beam can work well together using the proposed reinforcement method,giving full play to the superior mechanical properties of the cement-based composite materials reinforced by the high-strength steel strand network.Therefore,the bearing capacity,stiffness,ductility,toughness,and crack resistance of the unloading forcement rein-damaged beam can be significantly improved,and the crack width can be significantly reduced.Compared with the reinforced nondestructive beam,with the increase in the damage degree,all of the flexural bearing capacity,cross-sectional stiffness,ductility,and toughness of the unloaded reinforced damaged beam showed a decreasing trend.Moreover,the ability of the reinforcement layer to control concrete cracks also decreased.Appropriately creasing in-the reinforcement ratio of the longitudinal steel strands can improve the flexural bearing capacity,tional cross-sec-stiffness,ductility,and toughness of reinforced damaged beams and the restraint ability of the reinforcement layer to the crack.When the reinforcement ratios of various longitudinal steel strands are similar,the smaller the ameter di-of the steel strand,the stronger the crack control ability of the reinforcing layer.Therefore,the crack width can be better reduced.
作者
李可
葛辉
徐朝阳
朱俊涛
LI Ke;GE Hui;XU Chaoyang;ZHU Juntao(School of Water Resources and Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;Zhongchan Estate Co.,Ltd.of China Railway Group,Zhengzhou 450015,China)
出处
《哈尔滨工程大学学报》
北大核心
2025年第7期1388-1397,共10页
Journal of Harbin Engineering University
基金
国家自然科学基金青年项目(52108183)
国家自然科学基金面上项目(51879243)
国家自然科学基金委河南联合基金项目(U1804137)
中国博士后科学基金项目(2021TQ0302)
河南省高等学校青年骨干教师培养计划(2023GGJS002)。
关键词
高强钢绞线网
工程水泥基复合材料
结构加固
四点弯曲加载试验
损伤程度影响
受弯性能
钢筋混凝土梁
试验研究
high-strength steel wire strand mesh
engineered cementitious composites
structural reinforcement
four-point bending loading test
influence of the degree of injury
bending performance
reinforced concrete beam
experimental study
