| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 294284 | Marine Structures | 2009 | 12 Pages |
An extensive parametric study using detailed nonlinear finite element (FE) models, was conducted in order to develop a design equation for predicting Strain Concentration Factor (SCF) in field joints of X65 concrete coated pipelines under bending. Dimensions of the pipeline and coating, material properties of the coating and anti corrosion layer, as well as the loading level, were included in the design equation. Buckingham's theorem was incorporated to simplify the equation by introducing non-dimensionalized parameters. The design equation was fitted to FE data using the nonlinear least square regression, while additionally, margins of safety were defined using the confidence interval concept for practical applications. The interactive effect of parameters on SCF was studied, leading to the introduction of a single non-dimensional “coating parameter” that can accurately describe the upper limit of the SCF. This study concluded with a definition of a critical “coating parameter” which can be used to assess safe combinations of coating thickness and installation loads, thus preventing excessive strain concentration.
