Nonlinear simulation of reinforced concrete beams retrofitted by near-surface mounted iron-based shape memory alloys. (15th May 2019)

• Record Type: Journal Article
• Authors: Abouali, Sahar; Shahverdi, Moslem; Ghassemieh, Mehdi; Motavalli, Masoud
• Is Part Of: Engineering structures. Volume 187(2019)
• Page Start: 133
• Page End: 148
• Publication Date: 2019-05-15
• Subjects: Reinforced concrete beam -- Finite element modeling -- NSM strengthening -- Prestressing -- Iron-based shape memory alloys -- Concrete damaged plasticity model; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2019.02.060
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: FE modeling of RC beams strengthened with prestressed NSM Fe-SMA is presented. Nonlinear behavior of materials is simulated using appropriate constitutive models. Prestressing in Fe-SMA is introduced by defining a predefined field. A comparison to a beam strengthened with CFRP strips is presented. Developed FE model can be used to perform parametric studies of design variables. Abstract: Retrofitting of reinforced concrete members by near-surface-mounted (NSM) reinforcement is increasingly being investigated as an alternative strengthening method. Applying prestressing with the NSM technique enhances the load carrying capacity during service and results in better utilization of the strengthening material potentialities. Iron-based shape memory alloys (Fe-SMAs) are a cost-effective type of shape memory alloys and can be easily prestressed and used as NSM reinforcements. In this study, strengthening of RC beams in flexure with NSM Fe-SMA reinforcements is explored by developing a 3D nonlinear finite element model in ABAQUS. Comparison between the finite element (FE) model results and experiments in the literature confirms the accuracy of the proposed models. The validated FE model is then used to identify the effects of various design parameters on the performance of RC members strengthened with Fe-SMA reinforcements. Finally, an RC beam strengthened with NSM CFRP strip is modeled and compared to the NSM Fe-SMA strengthened RC beam. It is shown that ductility and energy absorption of the CFRP strengthened beam is significantly less than the Fe-SMA strengthened beam.