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Mechanical performances of concrete beams with hybrid usage of steel and FRP tension reinforcement

机译：钢筋与FRP加固混合使用的混凝土梁的力学性能。

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摘要

Fiber reinforced polymer (FRP) bars have been recently used to reinforce concrete members in flexure due to their high tensile strength and especially in corrosive environments to improve the durability of concrete structures. However, FRPs have a low modulus of elasticity and a linear elastic behavior up to rupture, thus reinforced concrete (RC) components with such materials would exhibit a less ductility in comparison with steel reinforcement at the similar members. There were several studies showed the behavior of concrete beams with the hybrid combination of steel and FRP longitudinal reinforcement by adopting the experimental and numerical programs. The current study presents a numerical and analytical investigation based on the data of previous researches. Three-dimensional (3D) finite element (FE) models of beams by using ANSYS are built and investigated. In addition, this study also discusses on the design methods for hybrid FRP-steel beams in terms of ultimate moment capacity, load-deflection response, crack width, and ductility. The effects of the reinforcement ratio, concrete compressive strength, arrangement of reinforcement, and the length of FRP bars on the mechanical performance of hybrid beams are considered as a parametric study by means of FE method. The results obtained from this study are compared and verified with the experimental and numerical data of the literature. This study provides insight into the mechanical performances of hybrid FRP-steel RC beams, builds the reliable FE models which can be used to predict the structural behavior of hybrid RC beams, offers a rational design method together with an useful database to evaluate the ductility for concrete beams with the combination of FRP and steel reinforcement, and motivates the further development in the future research by applying parametric study.
机译：由于纤维增强聚合物（FRP）的高抗拉强度，特别是在腐蚀性环境中，其用于提高混凝土结构的耐用性，近来已被用于增强弯曲状态的混凝土构件。但是，FRP的弹性模量低，直至断裂都具有线性弹性，因此，与类似构件的钢筋相比，具有这种材料的钢筋混凝土（RC）组件的延展性较低。有数项研究通过实验和数值程序显示了钢与FRP的纵向组合钢筋混凝土组合的混凝土梁的性能。当前的研究提供了基于先前研究数据的数值和分析研究。利用ANSYS建立了梁的三维（3D）有限元模型。此外，本研究还从极限弯矩承载力，荷载挠度响应，裂缝宽度和延性方面探讨了混合FRP钢梁的设计方法。通过有限元方法，将参数，钢筋混凝土抗压强度，钢筋布置方式以及FRP筋长度对混合梁力学性能的影响作为参数研究。从这项研究中获得的结果与文献的实验和数值数据进行了比较和验证。这项研究为混合FRP钢RC梁的力学性能提供了见识，建立了可用于预测混合RC梁结构性能的可靠有限元模型，提供了一种合理的设计方法以及一个有用的数据库来评估延性。 FRP与钢筋结合的混凝土梁，并通过应用参数化研究来推动未来研究的进一步发展。

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