Fatigue Behavior of Concrete Beams Prestressed with Partially Bonded CFRP Bars Subjected to Cyclic Loads

Materials

Viktor Gribniak¹  WooSeok Kim²  Yoseok Jeong²  David Hui³ 

[1] Department Institute of Building Materials, Vilnius Gediminas Technical University, 10221 Vilnius, Lithuania;Department of Civil Engineering, Chungnam National University, Daejeon 34134, Korea;Department of Mechanical Engineering, University of New Orleans, New Orleans, LA 70148, USA;

关键词: carbon fiber reinforced polymer;    cfrp;    ductility;    fatigue;    partially bonded bars;   

DOI  :  10.3390/ma12203352

来源: DOAJ

【 摘 要 】

The lack of ductility is the greatest concern in the applications of carbon fiber reinforced polymer (CFRP) materials, when used as pre-stressing reinforcements. To improve the ductility, a partially bonded FRP system which is intentionally unbonded in the middle part of the beam and bonded in both end parts of the beam has been developed and applied to prestressed concrete beams. While, many researchers investigated the instantaneous performance of partially bonded CFRP prestressed concrete beams, this study intended to evaluate the fatigue performance, the static load-carrying capacity after fatigue loading and ductility. Based on the fatigue loading tests followed by static loading tests, over-reinforced and web-confined partially bonded CFRP prestressed concrete beams exhibited satisfactory fatigue performance without cracks and stiffness degradation during fatigue loading. In addition, no degradation of load-carrying capacity was observed in static loading tests after the fatigue tests. The ductility index of concrete beams, prestressed with partially bonded CFRP bars, is combined with over-reinforcements and web-confinements, similar to that of beams prestressed with steel bars.

【 授权许可】

Unknown