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Prediction of IC debonding failure of precracked FRP strengthened RC beams using global energy balance

机译：利用全球能量平衡预测预裂FRP加固RC梁的IC脱胶失败

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Reinforced concrete (RC) beams strengthened with fiber reinforced polymer (FRP) have been extensively investigated, but the failure load of precracked beams strengthened with FRP has not been fully studied yet. When structurally deficient RC beams are repaired or strengthened using FRP, flexural cracks due to service load usually appear on the beams. Strengthened beams with precracking have been rarely examined, and most existing methods for predicting premature failures ignore the precracking effect. This research proposes a method for predicting debonding failure induced by intermediate crack (IC) for FRP-strengthened beams with precracking. The method consists of a numerical study on structurally damaged RC beams retrofitted with FRP laminate in the tension side of the beam. The method also applies the global energy balance approach in combination with fracture mechanics criteria to predict failure load for complicated IC-induced failure. The simulated results are validated against published experimental data and show good correlation.
机译：已经对纤维增强聚合物（FRP）增强的钢筋混凝土（RC）梁进行了广泛的研究，但对FRP增强的预裂梁的破坏荷载尚未进行充分的研究。当使用FRP修复或加固结构缺陷的RC梁时，通常会在梁上出现由于使用载荷引起的挠曲裂缝。很少有带有预裂的加固梁，而且大多数用于预测过早失效的现有方法都忽略了预裂效果。这项研究提出了一种预测带有预裂的FRP加固梁的中间裂纹（IC）引起的脱胶破坏的方法。该方法包括对在结构受力的钢筋混凝土梁的受力侧加装FRP层压板的数值研究。该方法还结合断裂力学标准应用了全局能量平衡方法，以预测复杂的IC引起的故障的故障负载。仿真结果针对已发表的实验数据进行了验证，并显示出良好的相关性。

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