Advanced Steel Construction

Vol. 6, No. 4, pp. 1934-1047 (2010)



Vittorio Nascè 1 and Francesco Tondolo 2,*

1 Full Professor, Politecnico di Torino, Department of structural and Geotechnical Engineering, corso Duca degli Abruzzi, 24, 10129, Torino, Italy

2,* Research Assistant, Politecnico di Torino, Department of structural and Geotechnical Engineering, corso Duca degli Abruzzi, 24, 10129, Torino, Italy

*(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)  

Received: 8 August 2010; Revised: 23 September 2010; Accepted: 2 October 2010




View Article   Export Citation: Plain Text | RIS | Endnote


The structural behavior of welded tee end connections used for circular hollow sections (CHS), depends on the number and the position of the tee webs. International specifications, such as ANSI/AICS and CIDECT Design Guide, provide design rules for joints made with one or two parallel tee webs, whereas the use of cross tee webs is not taken into consideration. However, the performance of such extensively employed connections cannot directly be referred to that of single tee web connection, as confirmed by the uniaxial tensile tests presented in this paper.   A numerical model, based on a nonlinear Finite Element approach, is also introduced to show the influence of some geometrical parameters on the structural efficiency of the joints.   As a result, a possible extension of the current design rules for CHS connections is also suggested.



Circular Hollow Section, Welded Tee End Connection, Uniaxial Tensile Test, FEM Analysis, Code Formulation


[1]       Wardenier, J., “Hollow Sections in Structural Applications”, CIDECT Publication, 2001, pp.199.

[2]       Wardenier, J., Kurobane, Y., Packer, J.A., van der Vegte, G.J. and Zhao, X.L., “Design Guide for Circular Hollow Section (CHS) Joints under Predominantly Static Loading”, CIDECT Publication, preliminary version, November 2007.

[3]       ANSI/AISC 360-05, “Specification for Structural Steel Buildings”, Chicago: American Institute of Steel Construction (AISC), 2005.

[4]       CAN/CSA-S16-01, “Limit States Design of Steel Structures”, Toronto: Canadian Standards Association (CSA), 2001.

[5]       Martinez-Saucedo, G., Packer, J.A. and Willibald, S., “Parametric Finite Element Study of Slotted End Connections to Circular Hollow Sections”, Engineering Structures, 2006, Vol. 28, pp. 1956-1971.

[6]       Kitipornchai, S. and Traves, W.H., “Welded-Tee End Connections for Circular Hollow Tubes”, Journal of Structural Engineering, ASCE, 1989, Vol. 115, No. 12, pp. 3155-3170.

[7]       Stevens, N.J. and Kitipornchai, S., “Limit Analysis of Welded-Tee End Connection For Hollow Tubes”, Journal of Structural Engineering, ASCE, 1990, Vol. 116, No. 9, pp. 2309-2323.

[8]       “Specification for the Design, Fabrication and Erection of Structural Steel for Buildings”, American Institute of Steel Construction, New York, N.Y., 1978.

[9]       AS 1250 Steel Structures Code, Standard Association of Australia, Sydney, 1981.

[10]     ADINA Finite Element System for Structures, Release 8.3, Watertown, USA, 2003.