导管架平台的二阶非弹性极限承载力分析

钢结构的高等分析是针对目前钢结构设计方法的缺陷而提出的一种二阶非弹性分析方法，考虑了几何初始缺陷、残余应力、剪切变形等非线性因素，能够准确地评估结构的极限荷载。本文将钢结构高等分析方法应用在海洋导管架平台极限承载力的分析中，以大型有限元软件ANSYS为平台，针对百年一遇工况下渤海的设计海洋荷载对结构进行静力分析。采用波流荷载的近似施加法进行二阶非弹性分析，分析不同初始缺陷对结构极限承载力的影响以及对比了两种缺陷分析方法对结构的影响。研究结果表明，钢结构的高等分析是必要的，初始缺陷与残余应力等影响因素会明显降低导管架平台的极限承载力，对于导管架平台的设计具有一定的指导意义。

The Second-order Inelastic of Ultimate Bearing Capacity of the Jacket Platform

The advanced analysis of steel structure is a second-order inelastic analysis method proposed in light of the defects of present steel design method ,which evaluate the ultimate bearing capacity of steel struc-ture accurately.The advanced analysis method considering geometrical and material nonlinearity ,nonlinear fac-tors including initial geometrical deflect ,residual stress and shear deformation that influent the structures ulti-mate bearing capacity.This paper applied the advanced analysis of steel structure to the ultimate bearing ca-pacity analysis of jacket platform for the first time.The calculation model built by the large element software ANSYS,the design load take the environment load encountered every 100 years and process structure static analysis.Finally a approximate wave load applied to calculate the ultimate bearing capacity of jacket platform. The results showed that:It’s necessary to analyze steel structure ,Influence factors such as initial defects and residual stress can significantly reduce the ultimate bearing capacity of the jacket platform ,and it has a certain guiding significance for the design of the jacket platform.