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Advisor(s)
Abstract(s)
The temperature, the deformation and the stress field in thermo-mechanical problems play a very important role in engineering
applications. This paper presents a finite element algorithm developed to perform the thermal and mechanical analysis of structural steel
piping systems subjected to elevated temperatures. The new pipe element with 22 degrees of freedom has a displacement field that
results from the superposition of a beam displacement, with the displacement field associated with the section distortion. Having
determined the temperature field, the consequent thermal displacement produced in the piping systems due to the thermal variation can
be calculated. The temperature rise produces thermal expansion and a consequent increase of pipe length in the structural elements. For
small values of the ratio of the pipe thickness to mean radius, the thermal behaviour can be calculated with adequate precision using a
one-dimensional mesh approach, with thermal boundary conditions of an axisymmetric type across the pipe section. With this condition,
several case studies of piping systems subjected to elevated temperatures and mechanical loads are presented and compared with
corresponding results from commercial finite element codes. The main advantage of this formulation is associated with reduced time for
mesh generation with a low number of elements and nodes. Considerable computational effort may be saved with the use of this finite pipe element.
Description
Keywords
Piping system Elevated temperatures Thermo-mechanical analysis Finite pipe element
Citation
Fonseca, E.M.M.; Melo, F.J.M.Q. de; Oliveira, C.A.M de (2005). The thermal and mechanical behaviour of structural steel piping systems. International Journal of Pressure Vessels and Piping. ISSN 0308-0161. 82:2 p.145-153
Publisher
Elsevier