Finite-Element Modeling of Tubular Joints. I: Numerical Results
Publication: Journal of Structural Engineering
Volume 121, Issue 3
Abstract
The results of a study of 12 tubular joint models with varying branch to chord diameter ratios β and branch inclination angles θ, subjected to axial tension, axial compression, and in-plane bending moment, are presented. The analyses were performed using finite-element software that is capable of modeling elasto-plastic material behavior and geometric nonlinearities as well as ductile and brittle fracture. The results showed that the current use of sin(θ) in design equations for inclined branches is reasonable, but somewhat conservative. When compared with the current experimental database, a close correlation of results was obtained for all axial tension cases, and for axial compression and in-plane bending moment cases for low to moderate β values. For a β value of 1 and compression and bending loads, the enhanced strength that was observed was attributed to uncertainty in the definition of failure, and the effects of various support conditions and chord lengths in the experimental studies. It is recommended that these properties be standardized for the definition of the database.
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References
1.
Beale, L. A., and Toprac, A. A. (1967). “Analysis of in-plane T, Y, and K welded tubular connections.”Bull. 125, Structural Steel Committees of the Welding Res. Council, University of Texas, Austin, Tex.
2.
Bolt, H. M., Seyed-Kebari, H., and Ward, J. K. (1992). “The influence of chord length and boundary conditions on K joint capacity.”Proc., Second Int. Offshore and Polar Engrg. Conf., International Society of Offshore and Polar Engineers, 347–354.
3.
Chaboche, J. L.(1988a). “Continuum damage mechanics: part I—general concepts.”J. Appl. Mech., 55, 55–64.
4.
Chaboche, J. L.(1988b). “Continuum damage mechanics: part II—damage growth, crack initiation, and crack growth.”J. Appl. Mech., 55, 65–74.
5.
Chen, T., and Wu, S. (1985). “The elastic-plastic finite element analysis of tubular joints of offshore drilling platform.”Proc., 4th Int. Conf., on Behavior of Offshore Struct ., Elsevier Science Publishers B. V., Amsterdam, The Netherlands, 813–821.
6.
Chow, C. L., and Wang, J.(1987). “An anisotropic theory of elasticity for continuum damage mechanics.”Int. J. Fracture, 33, 3–16.
7.
Chow, C. L., and Wang, J.(1988). “A finite element analysis of continuum damage mechanics for ductile fracture.”Int. J. Fracture, 38, 83–102.
8.
Cofer, W. F. (1988). “An analytical determination of ultimate strength of tubular joints for offshore structures,” PhD thesis, Georgia Institute of Technology, Atlanta, Ga.
9.
Cofer, W. F., and Jubran, J. S.(1992). “Analysis of welded tubular connections using continuum damage mechanics.”J. Struct. Engrg., ASCE, 118(3), 828–845.
10.
Cofer, W. F., and Will, K. M. (1990). “An analytical method for ultimate strength evaluation of tubular joints.”Proc., 9th Int. Conf. on Offshore Mech. and Arctic Engrg., Vol. III, M. M. Salama, H. C. Rhee, J. G. Williams, and S. Liu, eds., ASME, New York, N.Y.
11.
Cofer, W. F., and Will, K. M.(1991). “A three-dimensional, shell-solid transition element for general nonlinear analysis.”Comp. and Struct., 38(4), 449–462.
12.
Cofer, W. F., and Will, K. M.(1992). “A finite element technique for the ultimate strength analysis of tubular joints.”Engrg. Computations, 9, 345–358.
13.
Ebecken, N. F. F., and Ferrante, A. J.(1987). “Elasto-plastic analysis of tubular joints of offshore platforms.”Adv. in Engrg. Software, 9(1), 2–6.
14.
Ebecken, N. F. F., Lima, E. C. P., Landau, L., Chueiri, H. M., and Benjamin, A. C.(1987). “Computational techniques for the elastic-plastic analysis of tubular joints.”Engrg. Computations, 4, 126–130.
15.
Jubran, J. S. (1990). “Continuum damage mechanics applied to the fracture analysis of tubular joints,” thesis, Washington State University, Pullman, Wash.
16.
Jubran, J. S., and Cofer, W. F.(1991). “The ultimate strength analysis of structural components using the continuum damage mechanics approach.”Comp. and Struct., 39(6), 741–752.
17.
Lalani, M., and Bolt, H. M. (1989). “Strength of multiplanar joints on offshore platforms.”Conf. on Tubular Struct., International Institute of Welding, Finland.
18.
Lalani, M., Gholkar, S. F., and Ward, J. K. (1989). “Recent developments in the ultimate strength assessment of tubular joints: a nonlinear numerical treatment.”Proc., 21st Annu. Offshore Technol. Conf., Houston, Tex.
19.
Lawry, M. W. (1989). I-DEAS student guide . Structural Dynamics Research Corporation, Milford, Ohio.
20.
Lemaitre, J.(1984). “How to use damage mechanics.”Nuclear Engrg. and Des., 80, 233–245.
21.
Lemaitre, J.(1985). “A continuous damage mechanics model for ductile fracture.”J. Engrg. Mat. and Technol., 107, 83–90.
22.
Lemaitre, J.(1986). “Local approach to fracture.”Engrg. Fracture Mech., 25(5/6), 523–537.
23.
Marshall, P. W. (1992). Design of welded tubular connections. Basis and use of AWS code provisions . Elsevier Science Publishers, Amsterdam, The Netherlands.
24.
Pan, R. B., Plummer, F. B., and Kuang, J. G.(1977). “Ultimate strength of tubular joints.”J. Pet. Technol., 29(4), 449–460.
25.
Paul, J. C., van der Valk, C. A. C., Wardenier, J. (1989). “The static strength of circular multiplanar X joints.”Proc., Third Int. Symp. on Tubular Struct., E. Niemi and Mäkeläinen, eds., Elsevier Science Publishing Co., Inc., New York, N.Y.
26.
Soh, A. K., and Soh, C. K.(1991). “SCF equations for DT/X square-to-round tubular joints.”J. Constructional Steel Res., 19, 81–95.
27.
Toprac, A. A., Natarajan, M., Erzurumla, H., and Kanoo, A. L. J. (1969). “Research in tubular joints: static and fatigue loads.”Proc., 1st Annu. Offshore Technol. Conf., Houston, Tex.
28.
van der Vegte, G. J., Lu, L. H., Puthli, R. S., and Wardenier, J. (1992). “The non-linear behaviour of uniplanar tubular steel X- joints under out-of-plane loading.”Proc., Second Int. Offshore and Polar Engrg. Conf., San Francisco, Calif., 361–368.
29.
Ward, J. K., Billington, C. J., and Smith, J. K. (1992). “Strength assessment of a multiplanar joint in a North Sea jacket structure.”Proc., Second Int. Offshore and Polar Engrg. Conf., San Francisco, Calif., 369–376.
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Copyright © 1995 American Society of Civil Engineers.
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Published online: Mar 1, 1995
Published in print: Mar 1995
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