Experimental Investigation of Fatigue Behavior of Tension Steel Plate Reinforced with Prestressed CFRP Laminates
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摘要: 为较好地预测预应力碳纤维材料(CFRP)板加固钢结构的疲劳性能,采用考虑有效应力强度因子幅的Pairs公式,分析了粘贴预应力CFRP板加固钢板的疲劳裂纹扩展行为.通过粘贴CFRP板的含中心孔的预制裂纹钢板的疲劳试验,分析了应力比、CFRP板刚度、预应力及粘结胶性能等因素对疲劳裂纹扩展的影响.试验结果表明:加固后结构的疲劳寿命提高16倍以上,疲劳寿命的理论分析结果偏于保守;预应力是疲劳寿命的主要影响因素,而CFRP板和粘结胶性能的影响有限;应力比对疲劳寿命的影响很大,因此,对交通荷载的正确预估是加固能否取得成功的基础.Abstract: To properly estimate the fatigue performances of a steel structure reinforced with prestressed CFRP(carbon fiber reinforcement polymer) plates,a modified Paris’ equation based on effective stress intensity factor range was presented to analyze the propagation of fatigue cracks.The effects of stress ratio,CFRP stiffness,prestress and adhesive property on fatigue crack growth were investigated through the fatigue tests of central cracked specimens.The experimental results show that the fatigue lives of reinforced specimens extend greatly,more than 16 times that of an un-reinforced specimen,and that their theoretically predicted results are more conservative than the experimental results.The prestress,rather than the properties of CFRP and adhesive,dominates the fatigue behavior of a reinforced specimen.The stress ratio plays a significant role in the fatigue life of a reinforced specimen.Therefore,the proper estimation of traffic loading is the foundation of effective reinforcement.
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