ABSTRACT

This study proposes a procedure to determine the optimal design parameters and target reliability based on Life cycle cost (LCC) based analysis. An iterative design procedure is performed for different levels of reserve strength ratio (RSR), and LCC is calculated. A case study is carried out for installation of the bottom fixed jacket support structure for offshore wind turbines (OWT) system subjected to extreme loading condition. To determine the ultimate capacity of the structure, static pushover analysis is integrated with the proposed design methodology. An evolutionary based particle swarm algorithm is selected for the structural design optimization of offshore jackets. The RSR evaluated from pushover analysis assists to determine the probability of failure based on the first order reliability method (FORM). Based on a set of LCC values, which are the collective sum of capital expenditure (CAPEX), operational cost (OPEX), and risk cost (RISKEX), the optimal design is reached.

摘要

本研究提出了一种基于生命周期成本（LCC）分析来确定最佳设计参数和目标可靠性的程序。针对不同级别的储备强度比（RSR）执行迭代设计程序，并计算LCC。进行了案例研究，以安装承受极端载荷条件的海上风力涡轮机（OWT）系统的底部固定夹套支撑结构。为了确定结构的极限承载力，将静态推覆分析与建议的设计方法集成在一起。选择了基于进化的粒子群算法对海上夹层进行结构设计优化。通过推覆分析评估的RSR有助于根据一阶可靠性方法（FORM）确定故障的可能性。根据一组LCC值，