Flexural performance of FRP reinforced concrete beams

被引:104
作者
Kara, Ilker Fatih [1 ,2 ]
Ashour, Ashraf F. [2 ]
机构
[1] Nigde Univ, Dept Civil Engn, Nigde, Turkey
[2] Univ Bradford, Sch Engn Design & Technol, Bradford BD7 1DP, W Yorkshire, England
关键词
Concrete; Deflection; Moment capacity; Effective moment of inertia; Fibre reinforced polymer; BEHAVIOR; DEFLECTION; BARS;
D O I
10.1016/j.compstruct.2011.12.012
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
A numerical method for estimating the curvature, deflection and moment capacity of FRP reinforced concrete beams is developed. Force equilibrium and strain compatibility equations for a beam section divided into a number of segments are numerically solved due to the non-linear behaviour of concrete. The deflection is then obtained from the flexural rigidity at mid-span section using the deflection formula for various load cases. A proposed modification to the mid-span flexural rigidity is also introduced to account for the experimentally observed wide cracks over the intermediate support of continuous FRP reinforced concrete beams. Comparisons with experimental results show that the proposed numerical technique can accurately predict moment capacity, curvature and deflection of FRP reinforced concrete beams. The ACI-440.1R-06 equations reasonably predicted the moment capacity of FRP reinforced concrete beams but progressively underestimated the deflection of continuous ones. On the other hand, the proposed modified formula including a correction factor for the beam flexural rigidity reasonably predicted deflections of continuous FRP reinforced concrete beams. It was also shown that a large increase in FRP reinforcement slightly increases the moment capacity of FRP over-reinforced concrete beams but greatly reduces the defection after first cracking. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1616 / 1625
页数:10
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