摘要
海上浮式装置广泛应用于石油、化工、核电等领域,受海上风浪影响,海上浮式装置会产生剧烈的倾斜和摇摆现象。利用管道应力分析软件PepS对海上浮式装置管道系统进行力学分析时,必须考虑倾斜、摇摆载荷。采用载荷系数法,取虚拟节点的载荷系数,参照美国机械工程师学会(ASME)锅炉及压力容器规范,对倾斜、摇摆作用下的海上浮式装置管道进行了应力分析,为海上浮式装置管道的应力分析提供了有效示例。分析结果表明,载荷系数法计算出来的结果具有一定的保守性,当存在应力分析值超标或者过大的节点时,为真实地反映管道的结构应力情况和降低设计成本,可以用该节点处实际坐标的载荷系数重新计算该节点的摇摆载荷,进行该节点的应力评定,能够降低一定的保守性;同时在同一有限元模型下,对比有风浪和无风浪两种条件下应力分析结果,证明海上浮式装置受风浪造成的倾斜、摇摆载荷对管道造成了巨大的应力作用,因此,在设计阶段海上浮式装置管道应力分析研究中,应予以充分的考虑。
In application of offshore floating devices in the fields of petroleum,chemical and nuclear power,the devices will be severely tilted and swayed due to the impact of sea winds and waves.When the pipeline stress analysis software Peps being used to perform mechanical analysis on the piping system in offshore floating installation,the tilting and swaying loads must be considered.In this article,referring to the American Society of Mechanical Engineers boiler and pressure vessel specifications,using the load factor method and taking the load factor for the virtual node,the stress analysis of offshore floating device pipeline under the action of tilting and swaying was carried out,from which an effective example of stress analysis for the piping in offshore floating installation was demonstrated.It was shown from the analysis results that the results from the load factor method were conservative.When there are nodes at which the stress value exceeds the limit specified in standard or is too large,the load factor for real coordinate can be taken and recalculation be carried out and the stress be evaluated again so as to obtain the real stress distribution.In this way conservativeness may be reduced and design cost may be decreased.With the same finite element models,the stress analysis with and without wind wave were performed.It was proved form the results that the tilting and swaying loads caused by wind and waves on the floating device would produce great stresses in the pipeline.Therefore,in the design of the pipeline in offshore floating device,tilting and swaying loads should not be neglected.
作者
王伟
张富美
张立德
肖梦凡
田显伟
Wang Wei;Zhang Fumei;Zhang Lide;Xiao Mengfan;Tian Xianwei(China Nuclear Power Technology Research Institute Ltd,Shenzhen 518000,China)
出处
《化工设备与管道》
CAS
2020年第2期64-69,共6页
Process Equipment & Piping
关键词
海上浮式装置
倾斜
摇摆
应力分析
offshore floating device
tilt
sway
stress analysis
