CAJ | 학술논문

由于平台长期处于恶劣自然环境中,其可靠性分析成为当前海洋结构基本性能研究的主要方向.针对空间导管架海洋平台,采用有限元分析方法对结构在随机载荷作用下的可靠性进行分析.考虑5种不同的设计波浪工况,基于Morison公式和线性波理论,分析结构的环境载荷,利用ANSYS软件分析空间导管架平台的响应.选取其中的危险工况,基于导管架平台结构位移和应力的失效模式,选取结构尺寸、材料参数及波浪载荷为随机变量,采用APDL语言结合Monte Carlo模拟对海洋平台的结构可靠性进行分析.结果表明,该方法可用于求解固定式平台结构在风浪流载荷作用下的可靠性分析,得到结构失效的主要因素,并改进桩底和甲板与导管架连接处的设计.可为防止结构破坏提供依据,为进行复杂结构的可靠性分析提供参考.
유우평태장기처우악렬자연배경중,기가고성분석성위당전해양결구기본성능연구적주요방향.침대공간도관가해양평태,채용유한원분석방법대결구재수궤재하작용하적가고성진행분석.고필5충불동적설계파랑공황,기우Morison공식화선성파이론,분석결구적배경재하,이용ANSYS연건분석공간도관가평태적향응.선취기중적위험공황,기우도관가평태결구위이화응력적실효모식,선취결구척촌、재료삼수급파랑재하위수궤변량,채용APDL어언결합Monte Carlo모의대해양평태적결구가고성진행분석.결과표명,해방법가용우구해고정식평태결구재풍랑류재하작용하적가고성분석,득도결구실효적주요인소,병개진장저화갑판여도관가련접처적설계.가위방지결구파배제공의거,위진행복잡결구적가고성분석제공삼고.
Being long exposed to the harsh environmental conditions, the reliability analysis of jacket platform is the main research direction of current offshore structure basic performances. The finite element analysis on the structure reliability under random loading is performed for a spacial jacket offshore platform. Five different design wave conditions are considered, based on Morison equation and linear wave theory to analyze the environment loads on the structure; the ANSYS software is used for analyzing the jacket platform responses. Choosing one of the dangerous working conditions, based on the structure displacements and stress failure modes, the structure dimensions, material parameters and wave loads are chosen to be random variables, the APDL language is combined with Monte Carlo simulation to perform offshore platform structure reliability analysis. The result shows that this method can be used to solve the reliability analysis of fixed type platform structure under wind wave and current loads, the main factors for structure failure can be obtained, and the design of pile bottom and deck-jacket connection is improved. This study can provide some basis for structure damage prevention as well as the reference for complicated structure reliability analysis.