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首页> 外文会议>6th International conference on advanced composite materials in bridges and structures 2012 >FATIGUE OF GFRP REINFORCING BARS IN CONCRETE BEAMS
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FATIGUE OF GFRP REINFORCING BARS IN CONCRETE BEAMS

机译：混凝土梁中GFRP钢筋的疲劳

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摘要

The long term performance of glass fibre-reinforced polymer (GFRP) reinforced concrete members under cyclic loads is influenced by a number of factors and may be governed by the fatigue strength of the GFRP bar. Stress concentrations at crack locations typically result in some local partial debonding resulting in abrasion between the concrete and the reinforcing bars during repetitive loading cycles. This friction can lead to fretting of the FRP reinforcement and a significant reduction in the fatigue life of the bar. A modified beam-hinge specimen was used to simulate a cracked beam, allowing for an accurate estimation of the force in the bar at the crack. A total of fifteen beam-hinge specimens were tested to failure under monotonic and fatigue loading to investigate the effect of the concrete on the tensile fatigue of the GFRP reinforcement at a crack location. Test results showed that GFRP bars in concrete may have a shorter fatigue life than expected compared with fatigue tests on bare GFRP bars found in the literature.
机译：玻璃纤维增​​强聚合物（GFRP）增强混凝土构件在循环载荷下的长期性能受许多因素影响，并可能受GFRP筋的疲劳强度支配。裂纹位置处的应力集中通常会导致局部局部脱粘，从而导致在重复加载周期中混凝土与钢筋之间发生磨损。这种摩擦会导致FRP增强件的磨损，并显着降低钢筋的疲劳寿命。修改后的梁铰链样本用于模拟破裂的光束，从而可以准确估计裂缝处钢筋的力。总共测试了15个梁铰链试样在单调和疲劳载荷下的破坏，以研究混凝土对裂缝位置处GFRP增强材料的拉伸疲劳的影响。测试结果表明，与文献中发现的裸GFRP筋的疲劳测试相比，混凝土中的GFRP筋的疲劳寿命可能比预期的短。

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