Techno Press

Steel and Composite Structures   Volume 20, Number 3, February29 2016, pages 487-500
Flexural bearing capacity of diaphragm-through joints of concrete-filled square steel tubular columns
Bin Rong, Rui Liu, Ruoyu Zhang, Zhihua Chen and Fafitis Apostolos

Abstract     [Full Text]
    In order to investigate the flexural bearing capacity of panel zone of diaphragm-through joint between concrete filled square steel tubular column and steel beam, four specimens were tested under static tension loads to study the mechanical properties and bearing capacity of diaphragm-through joints with a failure mode of panel zone. Finite element models of these specimens were developed to simulate the test and compare the predicted failure modes, load-displacement curves and bearing capacities with the experimentally observed. It was found that the tensile load from the steel beam flange is mainly shared by the square steel tube and the diaphragm. The diaphragm plastic zone appears along the cross-section lines enclosed by the square steel tube and the influence of steel beam web on the plastic zone of the steel tube is significant and cannot be neglected. Computational models of yield lines on square steel tube and diaphragm are established based on the distribution pattern of the plastic zone, and an analytical method for the evaluation of the bearing capacity of the joint is proposed. The theoretical results and the experimental data are compared and found in good agreement.
Key Words
    diaphragm-through joint; flexural bearing capacity; static tensile loading experiment; finite element analysis; yield line
(1) Bin Rong, Rui Liu, Ruoyu Zhang:
Department of Civil Engineering, Tianjin University, Tianjin, 300072, China;
(2) Zhihua Chen:
Key Laboratory of Coast Civil Structure Safety, Tianjin University, Tianjin, 300072, China;
(3) Fafitis Apostolos:
Department of Civil and Environmental Engineering, Arizona State University, Tempe, 85287, USA.

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