Simple model to predict the torsional strength of recycled aggregate concrete beam
摘要
This paper presents a simplified analytical model for predicting the cracking and ultimate torsional strength of recycled aggregate concrete beams. This equation integrates the torsional strength of plain concrete and the contribution of hoop reinforcement. Notably, the concrete strength is represented by the cylindrical compressive strength with replacement ratio of coarse recycled aggregates. These equation is the combination of torsional strength of the plain concrete and the hoop reinforcement. In the concrete strength cylindrical compressive strength is considered. The validity of the proposed model for recycled aggregate concrete and natural aggregate concrete is assessed through a inclusive comparison of the predicted torsional strength with experimental results from 37 recycled aggregate concrete and 29 natural aggregate concrete test specimens subjected to torsion, as reported in existing literature. The propsed model highlighted worthy agreement for both the aggregate concrete. The predicted results for solid and hollow beams using the proposed model are further validated through comparisons with calculations from ACI-318 and the Space Truss Analogy equation. These comparisons reveal that the proposed equations strike a balance between the simplicity of code-based calculations and the accuracy of advanced models. Moreover, the results demonstrate that the proposed method achieves comparable accuracy for both recycled aggregate concrete solid and hollow beams, aligning with experimental findings.