The numerical analysis of the long-term behaviour of the reinforced concrete beams strengthened with carbon fibre reinforced polymer: Cracking

The proceedings of the 13th international conference "Modern Building Materials, Structures and Techniques" (MBMST 2019) Pub Date : 2019-12-03 DOI:10.3846/mbmst.2019.010

M. Daugevičius, J. Valivonis, T. Skuturna

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Abstract

The paper presents the analysis of the long-term deformability of the reinforced concrete beams strengthened with CFRP. The analysis is based on the obtained numerical and experimental data. The development of deformations is divided into stages. The comparison of the cracking process in the compressed and tensioned areas is performed. The comparative analysis of the results has shown that more attention should be paid to the creep of concrete and the influence of the tensioned reinforcement when the external load is decreased. The study has shown that the compression of the section subjected to long-term loading turns into tension when the external load is removed. Due to the effect of the tensile force, cracks appear on the top of the compressed section. Therefore, re-loading of the beam requires further evaluation of the strength degradation in the concrete of the compressed area.

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碳纤维增强聚合物加固钢筋混凝土梁长期性能的数值分析:开裂

本文对碳纤维布加固钢筋混凝土梁的长期变形性能进行了分析。分析是基于得到的数值和实验数据。变形学的发展分为几个阶段。在压缩和拉伸区域的开裂过程进行了比较。结果对比分析表明，当外加荷载降低时，应更加重视混凝土徐变和受拉钢筋的影响。研究表明，当去除外荷载时，受长期荷载作用的截面的压缩转变为张力。由于拉伸力的作用，压缩截面顶部出现裂纹。因此，梁的重新加载需要进一步评估压缩区混凝土的强度退化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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The proceedings of the 13th international conference "Modern Building Materials, Structures and Techniques" (MBMST 2019)

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