摘要
针对传统钢筋混凝土(RC)梁抗剪加固方法存在的自重增加与耐久性不足等问题,提出了一种钢筋增强地聚物混凝土与近表面粘贴(NSM)碳纤维增强聚合物(CFRP)绳索的协同抗剪加固新方法。开展了3根足尺矩形RC梁试件的三点弯曲试验,研究了不同加固措施对梁体受力性能的影响特性,并采用有限元模型进行验证分析。试验结果表明:协同加固梁的极限承载力分别较未加固梁提高了45.78%(NSM钢筋)和53.49%(NSM-CFRP绳索),开裂荷载和延性性能均明显增强;CFRP绳索与地聚物混凝土的协同作用有效控制裂缝的宽度与扩展路径,改善了梁的破坏模式,显著提高了能量吸收能力和结构可靠性。有限元分析准确模拟梁的荷载-位移全过程响应与破坏模式,验证了协同加固方法的有效性。研究成果可为RC梁抗剪加固技术的发展提供一定的参考。
To address the issues of increased self-weight and insufficient durability associated with traditional shear strengthening methods for reinforced concrete(RC)beams,a novel synergistic shear strengthening approach is proposed,which combines steel-reinforced geopolymer concrete with near-surface mounted(NSM)carbon fiber reinforced polymer(CFRP)ropes.Three full-scale rectangular RC beam specimens were subjected to three-point bending tests to investigate the effects of different strengthening measures on the structural performance of the beams,and finite element modeling was used for validation and analysis.The experimental results indicate that the ultimate load-carrying capacity of beams with NSM steel and NSM-CFRP rope strengthening increased by 45.78%and 53.49%,respectively,compared to unstrengthened beams,with significant improvements in cracking load and ductility.The synergistic action between CFRP ropes and geopolymer concrete effectively controlled crack width and propagation paths,improved the failure mode,and significantly enhanced energy absorption capacity and structural reliability.Finite element analysis accurately simulated the entire load displacement response and failure modes of the beams,verifying the effectiveness of the proposed synergistic strengthening method.The research findings may serve as a valuable reference for the advancement of shear strengthening techniques for RC beams.
作者
杨飞
王利川
YANG Fei;WANG Lichuan(Shanxi Polytechnic College,Taiyuan 030006,China;Shanxi Provincial Academy of Building Research Testing Center Co.,Ltd.,Taiyuan 030000,China)
出处
《混凝土》
北大核心
2025年第10期16-22,共7页
Concrete
基金
国家自然科学基金(50778118)
高等职业院校“工程造价”专业课程思政融入教育教学全过程的研究与实践(2022W230)。
