摘要
应用以Melan静力型安定定理为基础的弹塑性有限元数值方法,对海洋平台地基进行了变值加载条件下的安定性分析,同时,为便于比较,进行了静力极限分析。通过对海洋平台地基在各种荷载分量共同作用下的安定性分析,得到了地基在不同荷载组合模式下的安定荷载包络图。由此根据海洋结构上外载的可能变化模式可以确定地基的最可能失稳形式,从而评价复杂变值荷载作用下地基的稳定性。
A numerical procedure for shakedown analysis is presented,in which the elasto-plastic finite element method is combined with Melan's theorem of shakedown analyses. The proposed method is applied to evaluate both ultimate loads and shakedown loads of offshore platform foundations. Based on numerical results computed for different load modes,ultimate loads and shakedown loads of offshore platform foundation are compared. The ultimate loads and shakedown loads for different combinations of horizontal component and vertical component as well as moment constitute an envelope in the load space. Such envelope diagrams can be employed to rationally evaluate the dynamic stability of offshore platform foundations under complex varied loading pattern.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2004年第5期797-803,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金重点基金(59779017
50179006)
国家教育部跨世纪优秀人才培养计划研究基金资助项目。
关键词
弹塑性
海洋平台
地基
有限元
极限分析
安定性
荷载
elasto-plastic analysis,limit analysis,shakedown analysis,finite elements,offshore platform foundation
