Abstract
The operation for offshore oil has become an important issue in the recent years. Offshore platforms are some of those structures which are built to withstand environmental and accidental loads during oil exploitation operation. One of the most usual types of these platforms is the Jacket Type Offshore Platform (JTOP) which can be divided into three important parts, which are Deck, Jacket and piles. In order to increase the safety, particular attention should be paid to earthquake excitations which are directly applied to the piles of these structures. Nonlinearity in piles and buckling of the struts are important issues which have to be considered by the designers of offshore platforms. The case of nonlinearity in piles and failure capture in these members has not effectively been covered by researchers. Incremental Dynamic Analysis (IDA) is a powerful tool to assess the capacity of a structure upon seismic loads. In this paper incremental dynamic analysis has been implemented on single piles considering soil-pile interactions and free field site response. The use of nonlinear materials and lateral load resisting elements in the incremental dynamic analysis done in this paper has made it possible to get promising insights for incorporation of appropriate limit states and applications of performance based engineering. Special Engineering Demand Parameters (EDP) and Intensity Measures (IM) have been introduced for the single pile dynamic analysis in jacket type offshore platforms.
Highlights
Excavation for oil in offshore areas has begun for several years
Intensity Measure of a scaled accelerogram is a non-negative scalar or a vector[2] that has been proposed to characterize the intensity of a ground motion and Engineering Demand Parameter is a non-negative scalar that characterizes the response of the structural model due to prescribed seismic loading
In this research incremental dynamic analysis has been performed on single piles which are one of the most vital parts of an offshore platform
Summary
Excavation for oil in offshore areas has begun for several years. This industry relies on offshore structures as part of their existence. Calculated ground motion free field respons analysis Soil layers been developed for evaluating pile behavior under earthquake loading.
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