C-P混杂纤维混凝土疲劳变形规律研究

Study of Fatigue Deformation Law of C-P Hybrid Fibre Concrete

分析了碳纤维、聚丙烯纤维混杂纤维混凝土（C－PHFRC）弯曲疲劳变形的构成及其演变规律，讨论了混杂纤维增强混凝土在高频循环荷载作用下疲劳残余应变累积、循环应变幅值演化及疲劳总应变幅值发展的特性，建立了HFRC材料的弯曲疲劳变形模型。研究表明，随纤维掺量的增加，HFRC材料的循环应变发展起始阈值和疲劳前的残余变形均可提高。

In this paper,the constitution and developing law of bending fatigue deformation of C-P hybird fibre concrete are analysed. The fatigue residual strain cumulation,circulation strain range development and the charater of total fatigue strain range development of C-P hybird fibre reinforced concrete(HFRC) under high frequency circulation load are discussed and bending fatigue deformation model of HFRC is set up. Study shows that both initial value of circulation strain development and residual deformation before fatigue of HFRC can enhance with increment of fibre adding.