FRP筋混凝土界面疲劳黏结性能试验研究

发布时间：2018-05-05 19:12

本文选题：桥梁工程 + FRP筋混凝土　；参考：《公路交通科技》2017年03期

【摘要】：针对FRP(Fiber Reinforced Polymer/Plastics)筋混凝土界面黏结性能的疲劳寿命问题,开展了CFRP(Carbon Fiber Reinforced Polymer/Plastics)筋材与活性粉末混凝土RPC(Reactive Power Concrete)之间的疲劳黏结性能试验研究。试验详细研究了锚固长度、循环次数、应力水平以及应力幅值等参数对疲劳锚固性能的影响。结果表明,在疲劳荷载的作用下,组装件之间的黏结性能将随循环荷载次数的增加更加趋于稳定;在相同荷载等级下,锚固长度越大,CFRP筋相对于RPC的滑移量越小;在相同荷载等级下,应力幅值越大,CFRP筋相对于RPC的滑移量越大;200万次循环荷载后的CFRP筋抗拉刚度总体上略微降低,但对CFRP筋使用性能影响很小;疲劳后组装件极限承载力有所提高,疲劳荷载使CFRP筋与RPC的黏结处于更加稳定状态。总之,CFRP筋在超高性能混凝土RPC中具有极其优良的疲劳黏结锚固性能。
[Abstract]:Aiming at the fatigue life of FRP(Fiber Reinforced polymer / plastic reinforced concrete (FRP(Fiber Reinforced Polymer / plastic) reinforced concrete, the fatigue bonding behavior between CFRP(Carbon Fiber Reinforced polymer / plastic reinforced concrete and reactive powder concrete (RPC(Reactive Power concrete) was studied. The effects of Anchorage length, cycle times, stress level and stress amplitude on the performance of fatigue Anchorage were studied in detail. The results show that under fatigue load, the adhesion energy between the assemblies tends to be more stable with the increase of cyclic load times, and the larger the Anchorage length is, the smaller the slip between the RPC bars and the Anchorage length is at the same load level. At the same load level, the larger the stress amplitude is, the larger the slip value of CFRP tendons is relative to RPC, and the overall tensile stiffness of CFRP tendons decreases slightly after 2 million cyclic loads, but has little effect on the service performance of CFRP tendons. After fatigue, the ultimate bearing capacity of the assembly is increased, and the bond between CFRP bar and RPC is more stable. In short, CFRP bars have excellent fatigue bonding and anchoring properties in ultra high performance concrete (UHPC) RPC.
【作者单位】：长沙理工大学土木与建筑学院;新疆维吾尔自治区交通规划勘察设计研究院;
【基金】：国家自然科学基金项目(51208061) 长沙理工大学土木工程优势特色重点学科创新性项目(15ZDXK12)
【分类号】：U446.1

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