Nonlinear Dynamic Behavior of Fixed Jacket-Type Offshore Platforms Subjected to Simultaneously Acting Wave and Earthquake Loads

Abstract

The nonlinear dynamic response of jacket-type offshore platform (which has been installed in Persian Gulf) under simultaneously wave and earthquake loads is conducted. The interaction between soil and piles is modeled by Konagai-Nogami model. The structure is modeled by finite element method. The analyses include models with the longitudinal component of earthquake and wave in the same direction and in different directions. The results indicate that when the longitudinal component of earthquake and wave are in the same direction, wave may reduce the response of studied platform and when they are in different directions, in some cases there is an increase in the response of platform.

Torsionally coupled dynamic performance analysis of asymmetric offshore platforms subjected to wave and earthquake loadings

“…Therefore, it is necessary to investigate the dynamic response of platforms under the combined action of both earthquake and waves. Studies on the dynamic response of offshore platforms subjected to wave and seismic actions have been reported by some investigators (Isaacson and Songren, 1984;Kokkinowrachos and Thanos, 1990;Bea and Young, 1993;Venkataramana and Kawano, 1995;Venkataramana et al, 1998;Karadeniz, 1999;Fukusumi et al, 2003;Etemad et al, 2004;He and Li, 2007a, b). In these studies, a simplifi ed story model or detailed and complex fi nite element model was used for both elastic and inelastic response analyses.…”

Seismic analysis and test facilities of deep‐water bridges considering water–structure interaction: A state‐of‐the‐art review

“…The research declared that the maximum internal force of piles might increase by 10%–20% when considering the hydrodynamic effect. Etemad et al 136 examined the seismic responses of offshore engineering structures considering different directions of earthquake and wave. The results indicated that the maximum displacement under earthquake and wave combined excitation was 19.0% larger than that under earthquake.…”

“…The analysis methods of dynamic responses of deep‐water bridges considering water–structure interaction include numerical simulation and shaking table test 127–137 . Goyal et al 127 analyzed the dynamic responses of intake towers considering the hydrodynamic forces, and concluded that the hydrodynamic forces increased the dynamic responses of structure.…”

“…The analysis methods of dynamic responses of deep-water bridges considering water-structure interaction include numerical simulation and shaking table test. [127][128][129][130][131][132][133][134][135][136][137] Goyal et al 127 analyzed the dynamic responses of intake towers considering the hydrodynamic forces, and concluded that the hydrodynamic forces increased the dynamic responses of structure. Gao et al 135 built a finite element model of a sea-crossing cable-stayed bridge and analyzed the seismic responses of the bridge with water-structure interaction.…”