Theoretical Non-Linear Analysis of Composite ( Pultruded GFRP I-Section and Deck Concrete) Strengthened With GFRP Stiffness: Theoretical Non-Linear Analysis of Composite ( Pultruded GFRP I-Section and Deck Concrete) Strengthened With GFRP Stiffness. Samarra J. Eng. Sci. Res. 2024;2(1):64-75. doi:10.65115/eqtm2g20