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On the FE modelling of RC beams with a fibre-reinforced polymer (FRP)-strengthened web opening

机译：用纤维增强聚合物（FRP） - 加强卷筒纸开口的RC梁的FE模型

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摘要

In order to realize the strong column-weak beam hierarchy in existing reinforced concrete (RC) frames, a novel seismic retrofit technique (i.e., beam opening technique or BO technique) was proposed. The BO technique involves the cutting of a web opening in the RC T-section beam to weaken its flexural capacity, in combination with the installation of a fibre-reinforced polymer (FRP) strengthening system around the opening to offset the loss in shear capacity caused by the opening. While extensive experimental studies have verified the effectiveness of the BO technique, this paper presents a finite element (FE) study on the structural behaviour of RC beams with an FRP-strengthened web opening, for a more comprehensive and in-depth understanding of the performance of such beams. Two constitutive models of concrete were investigated, namely, the concrete damaged plasticity (DP) model and the brittle cracking (BC) model. Through detailed comparisons, it was found that for specimens failing in a flexural mode, the DP model is more appropriate; while for specimens failing in a shear mode, the BC model with the secant modulus of concrete adopted provides better predictions. A simple method for the selection of a proper FE approach is finally proposed.
机译：为了实现现有的钢筋混凝土（RC）框架中的强柱弱梁层次，提出了一种新的地震改造技术（即，光束开启技术或BO技术）。 BO技术涉及切割RC T型梁中的卷材开口，以削弱其弯曲能力，与在开口周围的纤维增强聚合物（FRP）强化系统的安装时，以抵消引起的剪切容量的损失开放。虽然广泛的实验研究已经验证了BO技术的有效性，但本文提出了一种有限元（FE）研究RC梁与FRP加强的网页开口的结构行为，以更全面，深入地了解性能这种梁。研究了两个组成型混凝土模型，即混凝土损坏的可塑性（DP）模型和脆性裂缝（BC）模型。通过详细的比较，发现对于弯曲模式失效的样本，DP模型更为合适;虽然对于在剪切模式下失效的标本，但是采用了混凝土的截线模量的BC模型提供了更好的预测。最终提出了一种选择正确的Fe方法的简单方法。

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