自升式平台桁架式桩腿的等效简化  

Equivalent Simplification of Truss Pile Legs of Jack-up Platform

作　　者：张宝瑜 冯士伦[1] 张元博 毛建斌 沈钰集 ZHANG Baoyu;FENG Shilun;ZHANG Yuanbo;MAO Jianbin;SHEN Yuji(School of Civil Engineering,Tianjin University,Tianjin 300072,China;Offshore Oil Engineering Co.,Ltd.,Tianjin 300451,China;Offshore Oil Engineering(Qingdao)Co.,Ltd.,Qingdao 266000,Shandong,China)

机构地区：[1]天津大学建筑工程学院,天津300072 [2]海洋石油工程股份有限公司,天津300451 [3]海洋石油工程(青岛)有限公司,山东青岛266000

出　　处：《中国海洋平台》2020年第5期41-46,共6页China offshore Platform

基　　金：国家自然科学基金(编号:51239008,51379145);国家重点基础研究发展计划(973项目)(编号:2014CB046800)。

摘　　要：以某自升式平台的桁架式桩腿为例,介绍桁架式桩腿在平台稳性分析中的等效简化方法。对算例结果进行分析,发现对于不同风向角得到的等效拖曳力因数不同。采用Moses稳性分析软件对桁架式桩腿进行细致的建模,计算不同风向角下的风载荷,与采用等效桩腿法得到的风荷载进行对比,发现细致建模得到的风荷载结果比采用等效桩腿法得到的结果稍大一些,说明桁架式桩腿的等效简化处理虽然有效,但是存在一定的安全隐患,建议在采用等效简化桩腿时,对等效桩腿的风力系数额外取1.2的安全因数,以保证平台稳性分析的可靠性和安全性。Taken the truss leg of a jack-up platform as an example,the equivalent simplification method of the truss leg in platform stability analysis is introduced.Through the analysis of the calculation results,it is found that the equivalent drag coefficients are different with different wind direction angles.The Moses stability analysis software is used to model the truss legs carefully.The wind loads under different wind direction angles are calculated and compared with those obtained from the equivalent pile legs method.It is found that the wind loads obtained by detailed modeling are larger than those obtained by the equivalent pile legs method.It shows that although the equivalent simplified treatment of truss pile legs is effective,there are still certain safety hazards.It is suggested that when the equivalent simplified pile legs are used,the wind coefficient of the equivalent pile legs be additionally taken as a safety factor of 1.2 to ensure the reliability and stability of the platform.

关 键 词：自升式平台 桁架式桩腿 等效简化 Moses软件 

分 类 号：TE95[石油与天然气工程—石油机械设备]