ABSTRACT

In-place analysis for offshore platforms is essentially required to ensure the structural integrity of platform components under extreme environmental conditions. The pile soil interaction is of great concern in structural behaviour of jacket-type fixed offshore platforms. Numerical modelling of a case-study platform with soil-pile-jacket-structure interaction is developed, the pile response demands in terms of lateral displacement and maximum bending moment and shear force, as well as soil reaction are investigated. The topsoil layers have important effects on the responses of the platform and supporting piles. A decrease in the upper soil layers' resistance leads to higher lateral displacement responses at platform base and a decrease in the shear force and bending moment along the pile shaft. The response results of the soil-structure interaction model of the jacket foundation, confirm that the flexible foundation model simulation is necessary to estimate the loads and response demands of the offshore platform well.

摘要

海上平台的就地分析基本上需要确保平台组件在极端环境条件下的结构完整性。桩土相互作用是导管架式固​​定式海上平台结构行为中的一个重要问题。建立了具有土-桩-护套-结构相互作用的案例研究平台的数值模型，研究了桩在横向位移和最大弯矩和剪力方面的响应要求，以及土的反应。表土层对平台和支撑桩的响应具有重要影响。上部土层阻力的降低导致平台底部的横向位移响应更高，并且沿桩身的剪力和弯矩降低。