Shear strength and behavior of recycled strap fiber reinforced concrete haunched beams

Abstract

Haunched beams also known as tapered beams, are structural elements characterized by varying depths along their span. In light of the growing concern over plastic accumulation on a global scale which provides a threat to the environment, and the challenges associated with employing traditional stirrups in the construction of tapered elements, this research paper has emerged.The approach of this study is divided into two main parts: an experimental phase and an analytical phase. In the initial stage, eight beams were subjected to testing to investigate the influence of tapered angles and the presence of recycled strap fiber on the shear behavior of tapered beams. The outcomes of this experimentation revealed a significant trend: as the tapered angles and fiber contents increased, the shear strength of haunched beams also increased.The subsequent phase of the study focused on an analytical examination, incorporating models proposed in various literature sources. A comprehensive database of 91 beams was assembled to facilitate the selection of the most suitable shear model for modification. Building upon the analysis of this extensive dataset, an equation was proposed. Additionally, a smaller dataset featuring tapered beams with fiber was collected to apply further analysis and demonstrate the models' performance. The predicted results by the proposed model showed good agreement with experimental test results.