Truss Reinforcement vs. Conventional Arrangements of Stirrup for Enhancing Shear Capacity of Slender Beams.
No Thumbnail Available
Date
2025-12-01
Authors
Tamrat Ali
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
This study investigates the importance of using truss reinforcement stirrup arrangement as an alternative to Conventional vertical stirrups as the shear reinforcement in slender reinforced
concrete (RC) beams. The goals of the study are to experimentally investigate the shear behavior and failure modes of slender RC beams with stirrups arranged in truss form compared to beams
reinforced with Conventional stirrups, and to develop numerical models using Abaqus that would simulate beam shear behavior and to verify the numerical models with the experimental results of the beams based on comparisons of load capacity, crack patterns, and failure modes and to select the best inclination angle. The experimental phase involves castings of three slender RC beams with the same dimensions, same materials and same load configurations, but with different stirrup configurations (Conventional vertical stirrups, non-staggered Warren truss stirrup, staggered Warren truss stirrup). And set the surface monitoring system with transducers to monitored shear strain at the left side of the front face of each beam. This study investigated the effectiveness of truss reinforcement to replace conventional vertical stirrups as shear reinforcement in slender reinforced concrete (RC) beams. The study objectives: experimentally investigating shear behavior and failure modes of slender RC beams with stirrups configured in truss form in comparison to beams using conventional stirrups. In the FEM study, five different models were used, including the conventional stirrup model and truss types with two different inclination angles of 45° and 57°. The findings revealed that all beams failed by shear mode, where the beams with the truss stirrups with 570 inclined exhibited higher ultimate shear strength than the beams with conventional stirrups. The non-staggered truss stirrups with 570 inclined had 18.25 % improvement for experimental ultimate load and 31.09 % improvement predicted using FEM. The staggered truss configuration with 570 inclined was shown to have the largest improvement with experimental ultimate load improvement of 26.75% improvement and FEM capacity increment of 32.89%. The staggered truss stirrups with 570 inclined were determined to be the most beneficial stirrup arrangement for improving shear strength. In FEM analysis, non-staggered and staggered truss stirrups inclined at 45° exhibit lower shear capacity than all other truss types and conventional stirrups, as observed in both experimental and FEM results.
Description
Keywords
Truss reinforcement, Shear capacity, Slender reinforced concrete beams, Stirrup arrangement, Finite element analysis, transducers