Cyclic tests of subassemblages with a concrete-filled box column connected to SRC or RC beams using couplers
Journal
Journal of Building Engineering
Journal Volume
106
Start Page
112511
ISSN
2352-7102
Date Issued
2025-07-15
Author(s)
Abstract
Concrete-filled box (CFB) columns are often used together with steel or steel reinforced concrete (SRC) beams in Asian buildings. For a concrete-encased steel column with an I-shaped section, the longitudinal bar in the beam usually passes through the steel column web. However, for a CFB column, the longitudinal bar in the SRC beam must bypass the steel column, which may degrade the force transfer and integrity of the beam-to-column connection. In Taiwan, longitudinal bars in the beam are typically connected to the steel built-up box section in CFB columns by using steel couplers. However, few studies have examined the seismic performance of this type of beam-to-column connection, particularly for longitudinal bars in SRC beams connected to CFB columns using couplers. Accordingly, this study experimentally investigated the cyclic responses of four full-scale beam-to-column subassemblage specimens that contained CFB columns connected to SRC or RC beams through couplers to transfer longitudinal bar force to the columns. The results indicated that the couplers transferred the beam longitudinal bar force effectively. The effect of a reduced beam section (RBS) and the stirrup shape on the beam responses was also investigated. The RBS improved the seismic performance of the SRC beam, and a monolithic stirrup outperformed a U-shaped stirrup with a top closure tie.
Subjects
Concrete-filled box column
Steel coupler
Subassemblage test
Weld fracture
SDGs
Publisher
Elsevier BV
Type
journal article