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Shear strain influence in the service response of FRP reinforced concrete beams

机译：剪应变对FRP钢筋混凝土梁使用寿命的影响

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摘要

Shear strains can become significant in the response of RC beams, especially in the case with longitudinal FRP reinforcement. The effect of the shear strains is studied in this paper through the numerical results of a 1D non-linear fibre model accounting for the axial-bending-shear interaction. Experimental data from. FRP RC beams, tested by the authors, are compared with the numerical results determined with the shear-sensitive and with a pure flexural 1D model in order to evaluate the effect of shear. A good correlation in terms of ultimate loads, deflections, strains in the concrete and reinforcement was observed between the experimental and numerical results when considering the shear strains, which represent around 15% of the deflections. The load-deflection response has also been compared with the analytical values given by the JSCE guidelines, showing a good agreement. The numerical model is also able to reproduce the cracking widths and pattern when increasing the applied load. Finally, a parametric study has been performed to analyse the effects of different parameters, such as the longitudinal and transverse reinforcement ratio, the modulus of elasticity of the longitudinal reinforcement, and the shear-span to depth ratio, on the shear deflections. (C) 2014 Elsevier Ltd. All rights reserved.
机译：剪应变在RC梁的响应中会变得很重要，尤其是在纵向FRP加固的情况下。本文通过一维非线性纤维模型的数值结果研究了剪切应变的影响，该模型考虑了轴向弯曲-剪切相互作用。实验数据来自。将作者测试的FRP RC梁与剪切敏感和纯挠性一维模型确定的数值结果进行比较，以评估剪切效果。当考虑剪切应变时，在极限载荷，挠度，混凝土和钢筋中的应变方面，在实验结果和数值结果之间观察到良好的相关性，剪应力约占挠度的15％。载荷-挠度响应也已与JSCE指南给出的分析值进行了比较，显示出很好的一致性。当增加施加的载荷时，数值模型还能够再现裂纹宽度和图案。最后，进行了参数研究，以分析不同参数（例如纵向和横向钢筋比率，纵向钢筋的弹性模量以及剪切跨度与深度之比）对剪切变形的影响。 （C）2014 Elsevier Ltd.保留所有权利。

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