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Advances in Concrete Construction   Volume 4, Number 4, December 2016, pages 319-332
Simulation of the behaviour of RC columns strengthen with CFRP under rapid loading
Soheil Esfandiari and Javad Esfandiari

Abstract     [Full Text]
    In most cases strengthening reinforced concrete columns exposed to high strain rate is to be expected especially within weak designed structures. A special type of loading is instantaneous loading. Rapid loading can be observed in structural columns exposed to axial loads (e.g., caused by the weight of the upper floors during a vertical earthquake and loads caused by damage and collapse of upper floors and pillars of bridges).Subsequently, this study examines the behavior of reinforced concrete columns under rapid loading so as to understand patterns of failure mechanism, failure capacity and strain rate using finite element code. And examines the behavior of reinforced concrete columns at different support conditions and various loading rate, where the concrete columns were reinforced using various counts of FRP (Fiber Reinforcement Polymer) layers with different lengths. The results were compared against other experimental outcomes and the CEB-FIP formula code for considering the dynamic strength increasing factor for concrete materials. This study reveals that the finite element behavior and failure mode, where the results show that the bearing capacity increased with increasing the loading rate. CFRP layers increased the bearing capacity by 20% and also increased the strain capacity by 50% through confining the concrete.
Key Words
    reinforced concrete column; failure; rapid loading; axial load; CFRP
Soheil Esfandiari: Department of Civil Engineering, College of Engineering, Sistan and Balouchestan University, Daneshgah Street-Zahedan, Iran
Javad Esfandiari: Department of Civil Engineering, College of Engineering, Kermanshah Branch, Islamic Azad University Kermanshah, Iran

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