Design of confinement reinforcement for encased composite columns. (1st January 2022)

• Record Type: Journal Article
• Authors: Chen, Chien-Chung; Chen, Cheng-Cheng; Zhan, Kai-Shen
• Is Part Of: Engineering structures. Volume 250(2022)
• Publication Date: 2022-01-01
• Subjects: Encased composite column -- SRC column -- Confinement reinforcement -- Cyclic loading -- Drift ratio; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2021.113342
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: This paper examines the efficiency of the confinement requirements among three selected specifications (ACI Specification, AISC Seismic Specification, and Taiwan encased composite building code) for designing encased composite columns. The analysis of this study identifies major parameters that are omitted from the current confinement requirements for encased composite columns. This paper proposes new confinement equations for encased composite columns. The proposed requirement correlates well with the flexural performance of the encased composite columns, warranting a consistent degree of safety for the range of properties studied. The proposed confinement equations significantly reduce the amount of required transverse reinforcement, relieving the challenges in detailing seismic hoop reinforcement around the structural steel core. Abstract: Confinement reinforcement for concrete columns is designed to ensure that the columns can withstand high lateral deformations during strong earthquakes. An accurate determination of the required confinement reinforcement is vital for achieving an efficient design, especially for encased composite columns in which reinforcement congestion can be a potential problem. This paper uses the confinement requirements among three selected specifications as the basis for developing confinement equations for encased composite columns. The specification selected herein are the ACI 318, AISC Seismic Specification, and Taiwan encased composite building code. In this study, new confinement reinforcement design equations are developed and validated against experimental results. The developed confinement provision, providing a means to quantify the confinement effect of I-shaped structural steel members, significantly reduces the required confinement reinforcement for encased composite columns, and consequently alleviates the reinforcement congestion problem.