FINITE ELEMENT ANALYSIS OF FLEXURAL BEHAVIOR OF DAMAGED RC BEAMS REINFORCED BY FRP
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摘要: 主要研究了FRP网格加固损伤钢筋混凝土梁的抗弯性能。研究中设计单根对照梁进行了四点弯曲试验,基于试验数据,利用ABAQUS建立并验证用于分析FRP网格加固效果的有限元模型。以FRP网格间距和FRP-混凝土界面处理为变量,通过有限元参数化分析,得到了加固参数对其加固效果的影响规律。研究结果表明:FRP网格非常有效地提升了损伤梁的承载力,梁的极限荷载提升了27.4%~43.4%。加固后梁的整体刚度提升比较大,屈服时的挠度略微减小,破坏时的挠度几乎没有变化。对于锚固情况不同的梁,无锚固梁的极限荷载高于锚固梁约10%。Abstract: This paper mainly studied the flexural behavior of damaged RC beams reinforced by FRP grids. A control beam was designed for a four-point bending test in this study. Based on the test data, a finite element model for analyzing the reinforcement effect of the FRP grid was established. The flexural behavior of the reinforcement scheme and the influence of grid spacing and FRP-concrete interface treatment on the reinforcement were obtained through the FEM analysis. The results showed that the reinforcement was very effective in improving the bearing capacity of the damaged beams, and the limit load of the beam was increased by 27.4%~43.4%. There was a greatly improvement in the overall stiffness of the beams after the reinforcement. The deflection at yield was slightly reduced and the deflection at failure hardly changed. For beams with different anchoring conditions, the limit load of the unanchored beams was about 10% higher than that of the anchored beams.
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Key words:
- FRP grid /
- damaged RC beam /
- finite element analysis /
- flexural reinforcement
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