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http://dx.doi.org/10.15683/kosdi.2015.11.1.1

Behavior of girth-welded buried steel pipes under external pressure  

Jeon, Juntai (Department of Civil & Environmental Engineering, Inha Technical College)
Lee, Chinhyung (The Graduate School of Construction Engineering, Chung-Ang University)
Chang, Kyongho (Department of Civil and Environmental & Plant Engineering, Chung-Ang University)
Publication Information
Journal of the Society of Disaster Information / v.11, no.1, 2015 , pp. 1-8 More about this Journal
Abstract
This paper presents finite element (FE) analyses to clarify the effects of external pressure on the residual stresses in a girth-welded steel pipe. At first, FE simulation of the girth welding process is carried out to obtain the weld-induced residual stresses employing sequentially coupled three-dimensional (3-D) thermo-mechanical FE formulation. Then, 3-D elastic-plastic FE analyses incorporating the residual stresses and plastic strains obtained from the preceding FE simulation are performed to investigate the residual stress behavior in the girth-welded pipe under external pressure. The FE analysis results show that the hoop compressive stresses induced by the external pressure significantly alter the hoop residual stresses in the course of the mechanical loading.
Keywords
Girth-welded steel pipe; Weld-induced residual stresses; Residual stress behavior; External pressure; Three-dimensional finite element analysis;
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