Deflection of prestressed concrete beam using fiber reinforced polymer (FRP) tendon

摘要

Numerical model analysis was carried out to study the deflection behaviour of FRP-based prestressed concrete (PSC) beam, because it does not resemble the existing deflection model of steel tendon-based PSC beam due to its non-ductile property. Deflection model by various researchers for the FRP-based PSC beams are underestimating as compared to experimental results which lead to unsafe design. There were 51 numbers of experimental results which were collected from various research articles for the numerical model analysis. Lagrange dual function convex optimisation used to predict the effective moment of inertia and shift of neutral axis distance. It reveals that the deflection of FRP tendon beam depends on deformability of material, degree of prestressing and bond strength. Design chart suggested for calculation of effective moment of inertia and effective neutral axis distance with respect to deformability index. The maximum deflection error by the proposed method is less than 5% as compared to experimental results.