2Master of the Department of Civil Engineering, NTUT, Taipei, Taiwan. The Design and Application of the Modular GFRP Flood Gate Yeou-Fong Li1 and Yu-Ju Kuo2 1Professor of the Department of Civil Engineering , NTUT, Taipei, Taiwan . 2Master of the Department of Civil Engineering, NTUT, Taipei, Taiwan. Introduction: The existing flood gates are made by metallic materials, which is expensive, subject to rust, too heavy to move or install. To solve the above problems, the high-strength, light weight and corrosion resistance materials, Glass Fiber Reinforced Plastics (GFRP), were used to design a modular flood gate. The appropriate GFRP members/components were chosen to perform the three-points bending test and finite element analysis, and to obtain the bending modulus of the GFRP members/components. Then, the deformations of the GFRP flood gates were measured from the static water pressure test. Comparing the experimental and finite element analysis results, the modular GFRP flood gates were proved to be very effective. Finally, the finite element analysis was executed for different span length and tabulated. Keywords： Glass fiber reinforced plastics, Flood gates, Finite element analysis 3 Points Bending Test Static Water Analysis Result (unit﹕mm) Force (kN) Displacement (mm) E (MPa) Square Beam 76 mm 0.83 0.55 17670 Grid 38 mm 6.75 45.02 5480 50 mm 15.90 60.01 5580 B.C.1 Static Water Pressure Test P1 P2 P3 P4 38 mm 1.461 2.351 3.040 2.818 50 mm 0.427 0.893 2.111 1.584 (unit﹕mm) B.C.2 B.C.3 Comparison between Experiment and Analysis P1 P2 P3 P4 Experiment (38 mm) 1.461 2.351 3.040 2.818 B.C.1 0.298 0.708 0.876 0.451 B.C.2 1.502 2.582 3.057 B.C.3 0.473 1.235 1.999 1.720 P1 P2 P3 P4 Experiment (50 mm) 0.427 0.893 2.111 1.584 B.C.1 0.203 0.462 0.574 0.330 B.C.2 0.491 0.775 0.729 0.362 B.C.3 0.314 0.799 1.317 1.239 (unit﹕mm)