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Dynamic Stability Analysis of Compliant Offshore Structures ��? A Case Study of Single Hinged Articulated Tower

Atreya, Prashant; Islam, Najrul; Alam, Mehtab; Hassan, Syed Danish

All the researchers in past have carried out dynamic response analysis of the structure under Wave, Earthquake or Wind loads or a combination of these loads and studied its behavior. Very few investigations have been reported which effectively incorporate hydrodynamic drag nonlinearity and study its effect on the stability of the systems. As oceanic waves are better modeled as stochastic process, there is a need to investigate the stochastic stability of flexible offshore structures as well. Present study have been carried out to determine seismic response of single hinged Articulated Tower under Wave and Earthquake loads followed by its dynamic Stability analysis. Dynamic stability analysis of compliant offshore structures constitute an interesting area of research because of their inherent non-linearities. The study has explored dynamic instabilities existing during the different phases of wave / earthquake loading on SHAT. A simple method of two-dimensional phase plots and bifurcation assessment has been used to identify phases of dynamic instability existing within the responses of SHAT under various conditions of loading.

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