Experimental Studies on Shear Behavior of FRP‐UHPC Hybrid Beams

Abstract Steel corrosion poses a significant challenge in infrastructure construction globally. Fiber Reinforced Polymer (FRP) offers a high‐performance solution with its lightweight, corrosion‐resistant, and high‐strength properties, making it widely used across various fields. Similarly, Ultra High Performance Concrete (UHPC) has emerged over the past 30 years as an innovative cement‐based composite with exceptional mechanical properties and durability. When compared to FRP‐concrete composites, FRP‐UHPC composites provide superior load‐bearing capacity, reduced weight, and enhanced durability. To study the process, phenomena, and modes of damage of hybrid beams with various shear‐to‐span ratios and concrete conditions, four glass fibre‐reinforced polymer (GFRP) profile‐normal concrete hybrid beam specimens and one GFRP profile‐ultrahigh‐performance concrete (UHPC) hybrid beam specimen were designed and tested in four‐point bending tests. The stiffness and bearing capacity of the GFRP profile‐normal concrete hybrid beams gradually decreased as the shear‐to‐span ratio increased. The GFRP profile‐UHPC hybrid beam members had better load‐bearing capacity and stiffness than the fibre‐reinforced polymer (FRP) profile‐normal concrete hybrid beam members. When the UHPC underwent compressive damage, the hybrid beam displayed obvious ductility as opposed to the GFRP profile‐normal concrete hybrid beam, which had insufficient ductility and showed no obvious evidence of damage. According to a parametric study, the ultimate load capacity of the hybrid beam declined as the shear‐to‐span ratio gradually rose.