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Nonlinear finite element analysis of layered steel fiber reinforced concrete beams
Computers & Structures ( IF 4.4 ) Pub Date : 2024-12-24 , DOI: 10.1016/j.compstruc.2024.107637
Anas M.H. Fares, Burcu Burak Bakir
Computers & Structures ( IF 4.4 ) Pub Date : 2024-12-24 , DOI: 10.1016/j.compstruc.2024.107637
Anas M.H. Fares, Burcu Burak Bakir
This study investigates the effect of fiber properties and SFRC layer thickness on the flexural behavior of layered beams that undergo both compression and tension failures. Four specimens tested in a prior experimental study are modeled utilizing nonlinear finite element software ABAQUS, and numerical results are verified by comparison with experimental results. Contrary to existing nonlinear models, developed model accurately predicts damage pattern, descending portion of the load–displacement relationship, and ultimate displacement, which results in an accurate estimation of energy dissipation capacity and ductility. Moreover, a comprehensive parametric study is carried out to investigate the effect of tension reinforcement ratio, fiber volume fraction, fiber aspect ratio, and SFRC layer thickness on flexural behavior. Numerical results verify the improvement of beam flexural behavior by increasing SFRC layer thickness and indicate the significance of defining a minimum layer thickness. If the SFRC layer has a thickness lower than 40% of beam depth, there is only limited improvement in the behavior even for fibers with high aspect ratios. In contrast to SFRC beams, layered SFRC beams with up to 1.5% steel fibers exhibit a minor increase in the load carrying capacity, while ductility and energy dissipation capacity significantly improve with increasing layer thickness.
中文翻译:
分层钢纤维混凝土梁的非线性有限元分析
本研究调查了纤维特性和 SFRC 层厚度对经历压缩和拉伸破坏的分层梁弯曲行为的影响。使用非线性有限元软件 ABAQUS 对先前实验研究中测试的四个试样进行建模,并通过与实验结果进行比较来验证数值结果。与现有的非线性模型相反,开发的模型准确预测了损伤模式、载荷-位移关系的下降部分和极限位移,从而准确估计了能量耗散能力和延展性。此外,还进行了全面的参数研究,研究了拉伸增强率、纤维体积分数、纤维长径比和 SFRC 层厚度对弯曲行为的影响。数值结果验证了通过增加 SFRC 层厚度改善了梁的弯曲行为,并表明了定义最小层厚的重要性。如果 SFRC 层的厚度低于光束深度的 40%,则即使对于高纵横比的光纤,其性能的改进也非常有限。与 SFRC 梁相比,钢纤维含量高达 1.5% 的分层 SFRC 梁的承载能力略有增加,而延展性和耗能能力则随着层厚的增加而显著提高。
更新日期:2024-12-24
中文翻译:
分层钢纤维混凝土梁的非线性有限元分析
本研究调查了纤维特性和 SFRC 层厚度对经历压缩和拉伸破坏的分层梁弯曲行为的影响。使用非线性有限元软件 ABAQUS 对先前实验研究中测试的四个试样进行建模,并通过与实验结果进行比较来验证数值结果。与现有的非线性模型相反,开发的模型准确预测了损伤模式、载荷-位移关系的下降部分和极限位移,从而准确估计了能量耗散能力和延展性。此外,还进行了全面的参数研究,研究了拉伸增强率、纤维体积分数、纤维长径比和 SFRC 层厚度对弯曲行为的影响。数值结果验证了通过增加 SFRC 层厚度改善了梁的弯曲行为,并表明了定义最小层厚的重要性。如果 SFRC 层的厚度低于光束深度的 40%,则即使对于高纵横比的光纤,其性能的改进也非常有限。与 SFRC 梁相比,钢纤维含量高达 1.5% 的分层 SFRC 梁的承载能力略有增加,而延展性和耗能能力则随着层厚的增加而显著提高。