Nonlinear finite element analysis of tubular joints
Yao, Xiaochun
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https://hdl.handle.net/2142/22405
Description
Title
Nonlinear finite element analysis of tubular joints
Author(s)
Yao, Xiaochun
Issue Date
1989
Doctoral Committee Chair(s)
Schnobrich, William C.
Department of Study
Civil and Environmental Engineering
Discipline
Civil and Environmental Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Language
eng
Abstract
In this study, important aspects of nonlinear behavior of tubular joints are numerically investigated with a finite element procedure including geometric and material nonlinearities. The numerical results give a clear and convincing physical interpretation of the effects of external loads on the ultimate static strength of tubular joints. The results include the stress redistribution within the joint at the ultimate state, the stiffness of the T-type joints at different load levels, the real failure modes of tubular joints under external loads and the assessment of the safety margins in the design process.
"The loading types applied to the joints include axial compression from the brace, axial tension, in-plane bending, combined loads of axial compression and in-plane bending. Based upon the numerical tests of a typical joints under six different combinations of in-plane bending and axial compression, the interaction equations in different design codes are verified. The safely margins hidden in these interaction equations are evaluated in two different ways. The first evaluation is based upon the ""theoretical accurate"" ultimate capacity of simple load $P\sb{u}$ or $M\sb{u}$. The second evaluation is based upon the predicted $\bar P\sb{u}$ or $\bar M\sb{u}$ values calculated with the current API design recommendation. It is the writer's hope that the research work in this study would help to bring about a comprehensive design criterion, which brings together available knowledge of theoretical results, physical understanding and laboratory research in a form suitable for practical design use."
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