THE ANALYSIS OF PARAMETRIC AND REINFORCEMENT COEFFICIENT ABOUT H-SECTION STEEL BEAMS REINFORCED BY PRESTRESSED CFRP PLATES

Abstract

Abstract: Sticking carbon fiber reinforced composite material is a new reinforcement method. Compared with the traditional reinforcement material, it has the characteristics of light weight and high strength. However, the strength utilization ratio of strengthened by common CFRP is low. Therefore, some scholars put forward the method reinforced by prestressed CFRP plates. In view of the present study, no concrete formula for stiffness of composite beams after reinforcement is given. Therefore, to study the effect of design parameters on H-section steel beam stiffness reinforced by prestressed CFRP plates, the finite element software ABAQUS was used to calculate the multi components under four-points-loading. The influence of CFRP plate length, thickness, width, modulus of elasticity and prestress level on the strengthening performance were analyzed. 0n this basis, the reinforcement coefficient was introduced. Combining with the calculation formula of the mid-span deformation on simple supported beam, the calculation formula for steel beam reinforced by prestressed CFRP plate was given. Afterwards, the calculation results of simplified calculation formula of reinforcement coefficient were compared with the results calculated by ABAQUS. The results show that length, width, thickness and prestress size of the CFRP plate have a significant influence on stiffness of reinforced steel beam. Meanwhile, the elastic modulus of CFRP plate has little effect on the stiffness of steel beam, and the simplified formula of strengthening coefficient has certain applicability and accuracy.

Key words: prestressed CFRP plate, stiffness after reinforcement, reinforcement coefficient, finite element

CLC Number:

TB332

DONG Shi-er, MA Meng-liang, WANG Yi-heng. THE ANALYSIS OF PARAMETRIC AND REINFORCEMENT COEFFICIENT ABOUT H-SECTION STEEL BEAMS REINFORCED BY PRESTRESSED CFRP PLATES[J]. Fiber Reinforced Plastics/Composites, 2019, 0(4): 17-24.

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