Strengthening of Simple Prestressed Beams Using Carbon and Glass Reinforcing Polymer Fibers
Subject Areas : Analysis of Structure and EarthquakeSeyed Fathollah Sajedi 1 , Amin Toolabi Shaykhi 2
1 - Associate professor, Department of Civil Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
2 - ME student, Department of Civil Engineering, Ahvaz University Jihad Institute, Ahvaz, Iran
Keywords: Abaqus Software, Strengthening, Prestressing, Simple prestressed beam, Carbon and glass fibers,
Abstract :
In this study, after evaluating the capability of Abaqus software and ensuring the results, two non-reinforced prestressed beams as reference models and 24 reinforced prestressed beams with carbon and glass reinforcing fibers and application of concrete with strength of 30, 40 and 50 MPa and prestressed cables with diameters of 16, 20 and 22 mm were modeled. After numerical analysis of prestressed concrete beams with and without reinforcing fibers, their bearing capacity was investigated. After numerical analysis of prestressed concrete beams with and without reinforcing fibers, their bearing capacity was investigated. It was concluded that in the simple reinforced concrete and prestressed beams, cracks resulting from tensile damage in the middle cross section of the beams with maximum stress are continuously reduced with a gentle slope towards the supports. In simple reinforced concrete and prestressed beams, the highest stresses were created in the tensile reinforcements at the bottom of the beam and in shear reinforcements, the stress get started in the middle section of the beams and exhibited its maximum in the lower part of the beam section. In addition, in simple prestressed concrete beams, the capacity was increased by raising the number of prestressed tendons from 1 to 2 and 3. The capacity of beams with 3 tendons has increased by 79% and 22% compared to the beams with 1 and 2 tendons, respectively. The bearing capacity of prestressed concrete beams with C50 consumption category were increased by 6% and 5% contrasted to the prestressed concrete beams made of C30 and C40 concrete categories, respectively. By comparing the reinforced models using carbon reinforcement sheets in comparison with the glass type, the bearing capacity of beams containing carbon fibers are enhanced by about 12% (on average) compared to different types of glass fibers.
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