Vol. 7, No. 10, 2012

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Experimental and analytical investigation of the behavior of diaphragm-through joints of concrete-filled tubular columns

Rong Bin, Chen Zhihua, Zhang Ruoyu, Apostolos Fafitis and Yang Nan

Vol. 7 (2012), No. 10, 909–929

Static tensile loading experiments and nonlinear finite element analysis were carried out to study the mechanical properties and failure modes of diaphragm-through joints of concrete-filled square steel tubular columns. Comparison between experimental data and finite element analysis revealed that the FE predictions of failure modes, load-displacement curves and bearing capacity agree with the test results. It was found that the tensile load from the steel beam flange is mainly shared by the square steel tube and the diaphragm. The plastic zone of the tube appears around the intersections of the tube and the diaphragm whereas the diaphragm plastic zone appears along the cross-section lines enclosed by the steel square tube. Calculation models of yield lines on square steel tube and diaphragm are established based on distribution pattern of plastic zone, and an analytical method for the design of such joints is proposed as well. The experimentally obtained bearing capacities of the tested specimens are in good agreement with the analytically computed capacities.

concrete-filled square steel tubular column, diaphragm-through joint, static tensile loading experiment, finite element analysis, analytical method
Received: 25 February 2012
Revised: 24 November 2012
Accepted: 9 December 2012
Published: 1 March 2013
Rong Bin
School of Civil Engineering and Key Laboratory of Coast Civil Structure Safety
Tianjin University
Tianjin, 300072
Chen Zhihua
School of Civil Engineering and Key Laboratory of Coast Civil Structure Safety
Tianjin University
Tianjin 300072
Zhang Ruoyu
School of Naval and Ocean Engineering
Tianjin University
Tianjin 300072
Apostolos Fafitis
Department of Civil and Environmental Engineering
Arizona State University
Tempe, AZ 85287
United States
Yang Nan
School of Civil Engineering
Tianjin University
Tianjin 300072