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Title: Real world considerations for strain-based design and assessment
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
Project No.:
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Catalog No.: 2313s
Date of Publication: 2014-03-01
Price: $25.00 US
Authors: Dr Yong-Yi Wang and Dr Ming Liu
Abstract: STRAIN-BASED DESIGN and assessment (SBDA) focuses on potential failures driven by high longitudinal strains. Pipeline failures driven by longitudinal stresses or strains are relatively rare events in comparison to failures driven by hoop stresses. Longitudinal strains are often associated with ground movement or other unusual upsetting events. SBDA is performed by comparing strain demand with strain capacity. Strain demand may be obtained from direct measurement or pipe-soil interaction models. Strain capacity is typically estimated using suitable models supported by experimental test data. There are gaps between the present approaches to SBDA and field conditions under which SBDA is applied. For instance, linepipes are delivered with a range of tensile properties. Welds are produced by a variety of processes with a range of tensile and toughness properties. Pipe dimensions, mechanical properties, and soil conditions affect both strain demand and strain capacity. The overall process of SBDA is introduced first. It can be seen that conditions assumed in models can be quite different from those in actual field applications. For instance, there can be considerable variations in the tensile strength of linepipes. The potential impact of strength variations on the measured/reported strain demand and strain capacity is described. The overall approaches to SBDA with appropriate consideration of actual field conditions are suggested. Some unresolved issues related to SBDA are described, particularly in the context of characteristics of modern linepipes.
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