Flexural testing for composite members with bolt-connected steel angles. (1st March 2021)

• Record Type: Journal Article
• Authors: Kim, Hyeon-Jin; Hwang, Hyeon-Jong; Park, Hong-Gun
• Is Part Of: Engineering structures. Volume 230(2021)
• Publication Date: 2021-03-01
• Subjects: Steel–concrete composite column -- Steel angle -- Transverse steel plate -- Bolted connection -- Prefabrication -- Flexural strength; 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.2020.111638
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: PSRC columns with bolt-connected steel angles and transverse plates were developed. Flexural strength of PSRC columns was greater than that of a conventional CES column. The bolted connections provided good bond strength between steel angles and concrete. Steel angles with bolt holes failed due to stress concentration at the bolt holes. Abstract: To improve the constructability of large columns, a prefabricated steel-reinforced concrete (PSRC) composite column with bolt-connected steel angles was developed. In the present study, flexural tests were performed on simply supported PSRC specimens to investigate the flexural capacity and bond strength between steel angles and concrete. The test results showed that the bolt assemblies and transverse plates projected from the angle surface provided good bond resistance between concrete and steel, preventing early bond failure. Due to the contribution of the corner steel angles, the maximum flexural strength of the PSRC specimens was greater than that of the conventional concrete-encased steel (CES) specimens with a steel section at the center. However, as the inelastic deformation increased, the steel angles suffered stress concentration and subsequent tensile fracture at the location of bolt holes, which decreased the ductility. Nonlinear section analysis was performed to verify the tested flexural moment–curvature relationship. The flexural strength predictions of current design methods and numerical analysis agreed with the test results.