Abstract
Offshore platform structure has the ability to resist wave loading, wind loading, operation loading, and ship collision, therefore, it is important to investigate the structural behavior of platform taking into consideration soil-structure-pile interaction when the platform is subjected to ship impact at a different location on deck slab. The present study deals with platform supported by pile foundation. The effect of soil-pile interaction on behavior of platform to lateral impact load is investigated by using finite element simulation which is performed by ABAQUS software. From the results obtained, it is obvious that the ship collision position on platform will be reflected on ultimate capacity of structure so the structure will undergo to loose ultimate capacity due to damage that occurs from the ship collision. This study comprises investigation of pile lateral displacement, pile twist angle, pile shear force distribution, pile bending moment distribution and deck slab displacement. It also clarifies that the pile displacement has been reflected on pile critical length. The twist angle of the pile is more sensitive to soil type and loading condition. It is seems that the shear force distribution and bending moment distribution are affected by loading condition and soil type. Finally this study shows that the response of deck slab depends on soil type, soil-pile interaction and loading condition.
Highlights
Offshore platforms are normally used for berthing of oil tankers
It is evident from the figure that the critical length of the pile in soft clay soil is higher as compare with pile embedded in medium clay soil and stiff clay soil
Displacement and critical pile length have a significant influence on evaluating the structural behavior of pile based on majority factors such as soil type and loading condition
Summary
The design of these platforms must be considered as the resistance to heavy impacts from ships in addition to the environmental loads [1]. Fenders can be described as absorption energy device whose fundamental target is to transform severe impact load into a reaction that both the structure and the ship can safely sustain [2]. In 1983 Amdahl investigated the circular tube deformation to lateral impact. In 1988 Wierzbicki and Suh investigated the circular tube deformation to the lateral impact. The load was applied by a line impact onto one section of the tube [6] In 2000 Al-Jasim investigated the berthing dolphin of Khor-Al-Amaya terminal number 8 to impact load from an oil tanker of 330000 DWT at 60% cargo [7]. In 2003 Hussein studied the dynamic response of three-dimensional offshore structure to couple load which consists of ship impact and wave loading [8]
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