Title: Unified Strength Model for Spiral-Steel Confined Concrete Columns

Author(s): Muhammad Junaid Munir, Syed Minhaj Saleem Kazmi, and Yu-Fei Wu

Publication: Structural Journal

Volume: 119

Issue: 2

Appears on pages(s): 247-255

Keywords: concrete columns; confinement; Hoek-Brown peak strength criterion; recycled aggregate concrete; steel spirals; strength

DOI: 10.14359/51734340

Date: 3/1/2022

Abstract:
Existing strength models of spiral-steel confined natural aggregate concrete (NAC) are based on the Richart et al. model. Furthermore, scant work related to the strength model of spiral-steel confined recycled aggregate concrete (RAC) is available in the literature. This paper focuses on developing a unified strength model for spiral-steel confined circular NAC and RAC columns based on the Hoek-Brown peak strength criterion. The Hoek-Brown peak strength criterion applies to the strengthening of concrete members with existing damage and can be extended to the performance enhancement of RAC through spiral-steel confinement. The performance of existing and proposed models is evaluated through a test database comprising the wide-ranging experimental results of spiral-steel confined circular concrete columns. Results show that the proposed model can effectively predict the peak strength of spiral-steel confined circular NAC and RAC columns, leading to structural applications of RAC.