Numerical Investigation of CFRP Aminate Post Tensioning Effect on RC Beam Performance and Flexural Capacity

Subject Areas : Analysis of Structure and Earthquake

Alireza Mirzaee ¹ , Ashkan Torabi ² , Arash Totonchi ³

1 - PhD Student, Department of Civil Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran
2 - Assistant Professor, Department of Civil Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran
3 - Assistant Professor, Department of Civil Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran

Received: 2022-01-15 Accepted : 2022-02-13 Published : 2022-02-20

Keywords: Abaqus Software, RC beam, Retrofitting, CFRP Laminate, Prestressing, Tensile Capacity,

Abstract :

Construction of reinforced concrete buildings is known as one of the most common and widely used construction methods in the world and a large number of buildings and other structures are built applying these materials every year. Advances in engineering sciences and the utility of new materials have improved the quality of construction and industry. The utilization of materials such as FRP or prestressed and post-tensioned systems has been considered by many engineers due to researches performed and their proper performance during past earthquakes.  In the present research, using ABAQUS software, the effect of flexural reinforcement of reinforced concrete beams using prestressed CFRP laminate (Carbon fiber reinforced polymers) has been investigated as a new and widely used method in strengthening and improving the performance of concrete beams. Different percentages of prestressing force according to the tensile capacity of CFRP laminate as an effective parameter in the final strength, have been investigated in this study. The results exhibit that the use of prestressing in CFRP laminate owing to its high tensile capacity and intrinsic performance can have a significant effect on increasing the stiffness and final strength of reinforced concrete beams. Analyses in this field indicate that the amount of prestressing force should not be more than 30% of the tensile strength of the- laminate, which is one of the cases mentioned by recent researches. Prestressing in the laminates also changes the cracking pattern in the critical area of ​​the reinforced concrete beams.