Analytical estimation of static stress range in oscillating steel catenary risers at touchdown areas and its application with dynamic amplification factors

Sensitivity studies of SCR fatigue damage in the touchdown zone using an efficient simplified framework for stress range evaluation

“…Further details on the choice of ranges can be found in Quéau et al (2014aQuéau et al ( , 2014b, Under review).…”

“…A programme of research (Quéau, 2014;Quéau et al, 2011Quéau et al, , 2013Quéau et al, , 2014aQuéau et al, , 2014b has been undertaken by the authors with the ultimate aim of proposing a simplified fatigue analysis and design framework for SCRs in the TDZ. The original intention was to use the dynamic amplification factor (DAF) approach for dynamic response of SCRs, since it is used widely for simplification of structural dynamic analyses for linear structural systems (e.g.…”

“…Throughout the study, numerical analysis of the SCR system has been carried out using the dynamic analysis software OrcaFlex (Orcina, 2011). Approximate, but accurate, analytical solutions can evaluate the static response (and maximum static stress range) of an SCR (Quéau et al, 2014a). However, since it is complex to develop analytical solutions able to accurately evaluate the dynamic response of SCRs in time domain, the approach has been to develop artificial neural networks (ANNs), trained using the numerical results from OrcaFlex.…”

“…(Quéau et al, 2014a, 2014b. The sensitivity studies were originally intended to increase the understanding of SCR behaviour and predict the DAF value using an advanced mathematical tool, the artificial neural network (ANN).…”

“…Indeed, this is essentially more convenient for the final user in future applications (the maximum dynamic stress range being directly linked to the fatigue damage). The development of such a framework was performed in Quéau et al (2014a, 2014b.…”