Determination of performance criteria of steel pipes subjected to axial compressive load and bending moment
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Tarih
2023
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Gazi Univ, Fac Engineering Architecture
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Purpose:It is of great importance to understand the progression of post-buckling damage mechanism of steel pipes when subjected to axial compressive and bending loads. In this study, it is mainly aimed to predict the plastic deformation level and principal limit states for given steel pipes with specific D/t ratio and mechanical properties under combined loads.Theory and Methods:Three different types of pipe profile are chosen that correspond to the characteristics of water transmission, gas and oil pipelines in Turkey. These high strength steel pipe profiles are modeled by using finite element program and subjected to axial compressive loads followed by bending loads. Capacity demand curves of these pipes are obtained numerically after conducting validation studies in accordance with a previous experimental research work.Results:The limit state of high strength steel pipes due to axial load and bending conditions is associated with local buckling which mainly depends on mechanical and geometrical parameters of pipe, initial imperfection and internal pressure. Thames water pipe (with 122 of D/t ratio) has reached its 90% of failure mode when subjected to 4.48 degrees of rotation angle. As for TANAP natural gas pipe (D/t ratio is 50) and BTC oil pipe (D/t ratio is 46), limit state has been reached after 18.77 degrees and 26.64 degrees rotation angles, respectively.Conclusion:It is seen that there is an inverse relationship in between axial loading and bending capacities of steel pipes. The limit state values for high strength steel pipes are reached at lower rotation angles due to high D/t ratio. Axial compressive loads give rise to premature failures and promote plastic deformations even under small displacement values. These premature failures form plastic hinge points which are considered to be the beginning of buckling and cause advanced type of buckling damage mechanisms in the following steps.
Açıklama
Anahtar Kelimeler
Buried pipeline, Limit states, Axial compressive load, Bending moment, Combined loading
Kaynak
Journal of The Faculty of Engineering and Architecture of Gazi University
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
38
Sayı
4
