Vol. 20, No. 4, pp. 345-363 (2024)
INTERFACE SHEAR DEMAND AND DESIGN OF PARTIALLY CONCRETE-FILLED
STEEL TUBULAR COLUMNS WITH TRANSVERSE DIAPHRAGMS
Jian Jiao 1, Yao-Jun Zhang 2 and Dan Gan 3, *
1 College of Water & Architectural Engineering, Shihezi University, Shihezi 832003, China
2 School of Civil Engineering, Chongqing University, Chongqing 400045, China
3 School of Civil Engineering and Geomatics, Southwest Petroleum University, Chengdu 610500, China
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 26 April 2024; Revised: 3 July 2024; Accepted: 8 July 2024
DOI:10.18057/IJASC.2024.20.4.3
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ABSTRACT
A partially concrete-filled steel tubular (CFST) column is formed by partially filling a steel hollow section (SHS) with concrete, its interface shear demand between the infilled concrete and steel tube is important in design but not usually considered. In this work, a refined finite element (FE) model of circular partially CFST columns with transverse diaphragms was established, followed by parameter analysis of the behavior under the combined axial compression and lateral loads. The main variables included the concrete filling ratio, axial compression ratio, diameter-to-thickness ratio of steel tubes, section size, aspect ratio, and material strength. The results indicate that the optimal filling ratio increases with the axial compression ratio, diameter-to-thickness ratio, and concrete strength, but decreases with the steel strength. Then, calculation methods for the optimal filling ratio, predicting the load capacity of transverse diaphragms, and the interface shear demand between the steel tube and infilled concrete were proposed. Finally, a design procedure for partially CFST columns with transverse diaphragms was proposed.
KEYWORDS
Composite structure, Finite element analysis, Optimal filling ratio, Shear demand, Transverse diaphragm
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