Chidchanok Pleesudjai, Carlos A. S. Oliveira, Daniel L. Araujo, Devansh Patel, Moacir Alexandre Souza de Andrade, Romildo Toledo Filho, Barzin Mobasher
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引用次数: 0
Abstract
This research explores the serviceability level characterization of hybrid reinforced concrete (HRC) beams with low reinforcement ratios in the range of 0.052%-0.262% under flexural test. Hybrid reinforced structural members use continuous reinforcement with randomly distributed chopped fibers in the matrix. The study focuses on the immediate post-cracking response of flexural beams to analyze parameters such as stiffness, deflection, strain transfer mechanisms, and ultimate strength response. The influence of steel fibers on flexure performance, ductility, and tensile strain, as well as the sharing of the flexural load are also studied. HRC beams are shown to have a higher first crack strength (15–24%) and stiffness in the serviceability domain compared to conventional RC beams regardless of the reinforcement ratio. The addition of up to 1.25% fibers contributes to the sharing of the flexural load such that reducing longitudinal reinforcement between 50 and 80% was associated with decreasing the ultimate load between 10 and 50% while still increasing the post-crack stiffness. Crack localization was found in both RC and HRC sections within a range of reinforcement ratios. The addition of fiber while maintaining the same reinforcement ratio confirmed the reduction in ductility. However, by adopting a lower limit of 3.0 for the deflection ductility ratio, HRC beams with up to 0.75% of steel fibers were found to be ductile, even despite presented softening behavior after the peak load.
期刊介绍:
Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.