纤维增强材料复材筋混凝土界面随机疲劳黏结性能试验研究

发布时间：2018-03-05 12:05

本文选题：FRP筋　切入点：黏结性能　出处：《工业建筑》2017年11期 　论文类型：期刊论文

【摘要】：针对(FRP)筋材与混凝土之间的界面脱黏问题,研究随机疲劳荷载作用下的FRP筋混凝土疲劳黏结性能对FRP筋在实际工程中的应用与推广具有重要的意义。在前期FRP筋与超高性能活性粉末混凝土(RPC)在等幅疲劳荷载作用下的黏结性能试验研究基础上,结合矮寨大桥的随机荷载谱研究,开展了对FRP筋疲劳前后承载能力研究和疲劳荷载循环次数、锚固长度对荷载-滑移曲线影响的试验研究,并计算分析得到经历200万次疲劳荷载后FRP筋的损伤量。结果表明:与等幅疲劳荷载作用相比,即使随机荷载对FRP筋的疲劳损伤程度略大,但在随机荷载作用下FRP筋与RPC仍能保持良好的黏结性能,且其疲劳寿命大于200万次,疲劳后FRP筋黏结试件极限承载能力在20%以内变化。
[Abstract]:Aiming at the problem of interfacial debonding between steel bar and concrete, It is of great significance to study the fatigue bonding properties of FRP reinforced concrete under random fatigue load for the application and popularization of FRP tendons in practical engineering. In the early stage, FRP tendons and ultra-high performance reactive powder concrete (UHPC) are subjected to constant amplitude fatigue loading. On the basis of the experimental study of bonding properties under loading, Based on the study of random load spectrum of Aizhai Bridge, the experimental study on the load-bearing capacity of FRP tendons before and after fatigue and the influence of fatigue load cycle times and anchoring length on load-slip curves is carried out. The damage of FRP tendons after 2 million fatigue loads is calculated and analyzed. The results show that compared with the constant amplitude fatigue loads, the fatigue damage of FRP tendons is slightly greater under random loads. However, under random loading, FRP bars and RPC can still maintain good bonding performance, and their fatigue life is more than 2 million times, and the ultimate load-bearing capacity of FRP tendons bond specimens after fatigue varies within 20%.
【作者单位】：长沙理工大学土木与建筑学院;贵州省交通规划勘察设计研究院股份有限公司;新疆维吾尔自治区交通规划勘察设计研究院;
【基金】：国家自然科学基金资助项目(51208061) 湖南省教育厅重点科研项目(17A010) 长沙理工大学土木工程优势特色学科创新性项目(15ZDXK11)
【分类号】：TU528

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