Experimental and numerical assessment of intraply hybrid composites strengthened RC deep beams

In recent years, significant progress has been made in developing fiber-reinforced polymers (FRPs), leading to the manufacture of various composite types derived from different techniques and materials. One notable advancement in this field is the emergence of Intraply Hybrid Composites (IRCs), which have attracted significant attention in modern FRP research. This study builds upon and expands the existing knowledge base, drawing from the methodologies and findings of two previously published articles by Cakir et al. 2021 [1] and 2023 [2]. These prior studies focused on reinforcing beams, utilizing IRCs in 2-meter and 1.5-meter-long configurations. Following the methodologies of the previous studies, the current research focuses on 1.0-meter-long deep beams and aims to further explore the application of IRCs in the construction industry and their impact on the shear strength of reinforced concrete (RC) beams. Consistent with the objectives and methodologies of the previous studies, a series of 1-meter-long RC beams, characterized by a shear span-to-depth ratio (a/d = 1) and lacking transverse reinforcement, are prepared for experimentation. These beams are then reinforced using three distinct types of IRCs: Aramid-Carbon (AC), Glass-Aramid (GA), and Carbon-Glass (CG). The effectiveness of IRC integration is evaluated through comprehensive four-point bending tests performed following the U-shaped strengthening. Employing a multifaceted approach, the assessment of the influence of the IRCs on the structural behavior of the beams involves finite element analysis (FEA) techniques, as well as traditional measurement tools such as strain gauges (SGs) and linear variable differential transducers (LVDTs). Consequently, it has been found that IRC reinforcements enhance the load-bearing and displacement capacities of the beams without changing the failure modes.