UHPFRC-NC Composite Beam Flexural Strength and Toughness Performance

Abstract

Ultra-High Performance Fiber-Reinforced Concrete (UHPFRC) effectively controls crack width, enhances tensile properties, and improves concrete toughness. This study explores the UHPFRC combination with normal concrete (NC) to form a composite beam, addressing the issues related to UHPFRC's material properties and application costs. The proposed nonlinear analytical solution, utilizing an equivalent stress block model, was employed in this study. Additionally, sensitivity tests were conducted on critical parameters such as UHPFRC thickness and NC compressive strength. Verification involved designing UHPFRC-NC composite beams with distinct steel fiber volume ratios. The results indicate that nonlinear analysis accurately reflects material behavior, contributing significantly to section design. Properly designed composite beams can meet safety requirements, economic considerations, and mechanical properties.