VARIATION OF GEOMETRY EFFECT ON THE BEHAVIOR OF HYBRID FIBER REINFORCED HIGH STRENGTH CONCRETE BEAMS UNDER ECCENTRIC FLEXURAL LOADING

Abstract

This research presents a detailed numerical analysis of the flexural behavior of reinforced concrete beams composed of Normal Concrete (NC), High-Strength Concrete (HSC), and Hyper Concrete (HyC) under eccentric loading conditions. Using Abaqus Finite Element Analysis (FEA), the study explores the impact of geometric variations—specifically beam depth, width, and span length—on structural performance. The results reveal that increasing beam depth from 200 mm to 300 mm enhanced load-carrying capacity by up to 26% and reduced deflection by approximately 40%. Reducing the beam width from 150 mm to 100 mm resulted in a 6–10% decrease in maximum load capacity and increased deflection by around 20%. A shorter span length, reduced from 2000 mm to 1500 mm, improved the load resistance by up to 32% and lowered deflection by 50% compared to standard configurations. Among the three materials tested, Hyper Concrete consistently outperformed NC and HSC, achieving the highest maximum load of 123.8 kN and demonstrating enhanced ductility and crack control with moderate deflections ranging between 12.1–15.2 mm. These findings highlight the critical role of geometric optimization and advanced composite materials in improving the flexural performance of reinforced concrete structures, offering practical insights for modern structural design.