Effect of Pile- Soil- Structure Interaction on Dynamic Characteristic of Sample Jacket Type Offshore Platform by Experimental and Numerical Investigation

Rahman Shokrgozar, Hamed and Asgarian, Behrouz (2013) Effect of Pile- Soil- Structure Interaction on Dynamic Characteristic of Sample Jacket Type Offshore Platform by Experimental and Numerical Investigation. In: The 1st Iranian Conference on Geotechnical Engineering, October 2013, Ardabil, Iran.

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Abstract

Dynamic response of Pile Supported Structures is highly depended on the Pile Soil Structure Interaction. In this paper, by comparison of experimental and numerical dynamic response of a prototype jacket type offshore platform for both hinge based and pile supported boundary conditions, effect of soil-pile-structure interaction is studied. Jacket and deck of a prototype platform is installed on a hinge-based case first and then platform is installed on eight skirt piles embedded on continuum monolayer sand. Dynamic characteristics of both cases of platform in term of natural frequencies, mode shapes and modal damping are computed and compared with the others. Numerical simulation of responses for the studied structure is also performed for both cases using capability of ABAQUS software. The 3D model of ABAQUS is created using continuum elements for soil and piles, and beam elements for jacket and deck elements. Mohr-Coulomb model and pile-soil contact theory are used for considering nonlinear inelastic soil properties. It is observed that dynamic characteristics of the system changes significantly due to soil-pile-structure interaction. Meanwhile, finite element model can also predict this effect accurately for the studied platform in small range of deformation.

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