摘要
为改善钢筋混凝土框架的抗震性能,采用碳纤维增强复合材料(carbon fiber-reinforced polymer,CFRP)加固钢筋混凝土框架柱,通过抗震拟静力对比试验,研究了碳纤维布加固对钢筋混凝土柱破坏模式、耗能滞回曲线、刚度和承载力退化规律以及延性等方面的影响。试验结果表明:CFRP加固模型的极限承载力、初始刚度和延性分别提高43.89%、39.27%、30.10%;基于数值模型参数化研究,定量揭示了碳纤维布加固对钢筋混凝土柱抗震提升的贡献,提出了碳纤维加固优化设计思路。该文研究表明,采用CFRP全包加固和条带加固钢筋混凝土框架模型,整体结构的极限承载力、延性和耗能能力均有不同程度的提高,使得柱端破坏减小,梁端破坏增大,整体破坏模式由柱铰破坏向梁铰破坏转变;同时,不同CFRP加固面积和CFRP之间的间距影响对混凝土结构的加固效果。基于该文成果,条带宽度与间距比值的建议值为1.00~1.25。
In order to improve the seismic performance of reinforced concrete(RC)frames,carbon fiber-reinforced polymer(CFRP)was used to retrofit reinforced concrete frame structures.The effects of CFRP on the failure mode,the energy dissipation characteristics,the lateral stiffness degradation patterns,the ultimate bearing capacity degradation and the ductility of RC columns were investigated by the pseudo-static tests.The results show that the peak bearing capacity,initial stiffness and ductility of the CFRP reinforced model are increased by 43.89%,39.27%and 30.10%,respectively.Based on the parametric study of the finite element model,the contribution of CFRP to the seismic upgrading effect of RC columns was quantitatively revealed,and the optimized design of CFRP retrofitted was proposed.The results indicated that the peak load,ductility and energy dissipation capacity of the whole structure are improved by using CFRP full-wrap reinforcement and strip reinforcement models with different coverage areas.The damage degree of column decreases,the damage degree of beam increases,and the failure mode changes from“column hinge”to“beam hinge”.Simultaneously,different CFRP reinforcement areas and the distance between strip-shaped CFRP have different reinforcement effects on concrete structures.Based on the investigation results,the recommended ratio of the width of CFRP strip to its spacing is 1.00 to 1.25.
作者
周洋
刘翔宇
张学坦
ZHOU Yang;LIU Xiangyu;ZHANG Xuetan(Collage of Earthquake Engineering and Construction Safety,Institute of Disaster Prevention,Sanhe 065201,China;Key Laboratory of Building Collapse Mechanism and Disaster Prevention,China Earthquake Administration,Sanhe 065201,China;Hebei Technology Innovation Center for Multi-Hazard Resilience and Emergency Handling of Engineering Structures,Sanhe 065201,China;Langfang Key Laboratory of Anti-Seismic Collapse of Engineering Structures,Sanhe 065201,China)
出处
《地震工程与工程振动》
北大核心
2025年第4期180-190,共11页
Earthquake Engineering and Engineering Dynamics
基金
国家重点研发计划项目(2024YFC3015704)
中国地震局建筑物破坏机理与防御重点实验室开放基金项目(FZ201102)
河北省重大科技支撑计划(24295401Z)。
关键词
碳纤维增强复合材料
钢筋混凝土柱
拟静力试验
有限元数值模拟
抗震性能
carbon fiber-reinforced polymer
reinforced concrete column
pseudo-static test
finite element numerical simulation
seismic performance
