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Buckling Uncertainty Analysis for Steel Pipelines Buried in Elastic Soil Using FOSM and MCS Methods
Allaeddine Athmani,Asma Khemis,Abdelmadjid Hacene Chaouche,Kong Fah Tee,Tiago Miguel Ferreira,Romeu Vicente 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.2
Generally, buried steel pipes are designed for good transverse behavior by neglecting soil–structure interaction eff ect. Steel pipelines are also usually designed to prevent from the important failure mode of buckling. However, the design of this type of structures does not normally consider the uncertainties in soil and structural properties. To address the above issues, the paper estimates the uncertainties in terms of the coeffi cient of variation of critical buckling displacement, CV w using subgrade reaction theory (Winkler model) and fi rst-order second-moment (FOSM) method. Two cases of boundary conditions have been considered in this study. In the fi rst case, CV w is calculated within an infi nitely thick soil as a function of uncertainty of subgrade reaction modulus ( K s ). In the second case, CV w is calculated in a thick soil cylinder as a function of the uncertainty of the eff ective subgrade reaction modulus ( K′ S ). Furthermore, the uncertainty of pipe fl exibility ( S f ) is also taken into account in the two cases. Uncertainty calculations by the FOSM method are then validated with those obtained from traditional Monte Carlo simulations.
Asma Khemis,Abdelmadjid Hacene Chaouche,Allaeddine Athmani,Kong Fah Tee 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.59 No.4
The failure of civil engineering systems is a consequence of decision making under uncertain conditions. Generally, buried flexible pipes are designed for their transversal behavior to prevent from the important failure mode of buckling. However, the interaction effects between soil and pipe are neglected and the uncertainties in their properties are usually not considered in pipe design. In this regard, the present research paper evaluates the effects of these uncertainties on the uncertainty of the critical buckling hoop force of flexible pipes shallowly buried using the subgrade reaction theory (Winkler model) and First-Order Second-Moment (FOSM) method. The results show that the structural uncertainties of the studied pipes and those of the soil properties have a significant effect on the uncertainty of the critical buckling hoop force, and therefore taking into account these latter in the design of the shallowly flexible pipes for their buckling behavior is required.