【作者】 穆春生；

【导师】 张文福； 任意；

【作者基本信息】 东北石油大学 ， 建筑与土木工程， 2011， 硕士

【摘要】 液化天然气(Liquefied Natural Gas,以下简称LNG)具有便于运输和储存、使用安全的特点,在过去的几十年中,世界LNG消费量大幅度增加,各国均将液化天然气作为一种低排放的清洁燃料加以推广。LNG储罐是存储、使用LNG过程中所用到的重要设备。目前国外对LNG储罐已有不少研究成果并且很多成果已应用到工程实际中,但是针对LNG储罐内、外罐壁在静力荷载作用下的受力性能和变形规律研究还不是十分完善,同时结构设计人员也迫切需要了解LNG储罐在承受各种静力荷载时的内力及变形规律。因此,开展LNG储罐在静力荷载作用下受力性能分析研究具有重要的意义。本文以实际工程为研究对象,利用现有大型有限元软件ANSYS10.0,对LNG储罐进行静力作用下的内力分析,研究LNG储罐在不同荷载工况下的受力,从而为设计提供可靠的计算和分析依据。主要内容包括:1.简要介绍大型LNG储罐的发展概况、结构形式及其在国内外的发展和研究状况。对有限元软件ANSYS10.0特点、功能和分析过程进行了简单的介绍,将LNG储罐简化为板壳问题,再选取合理的单元,用有限元软件建立了LNG储罐内、外罐壁有限元模型;2.介绍了计算罐壁应力方法,即“短圆柱壳法”、“长圆柱壳法”,以及参考美国API650(美国石油学会标准)罐壁壁厚设计方法,结合锚固储罐的应力分布特点的一种新的组合圆柱壳法。利用ANSYS静态分析法对LNG储罐内罐和外罐有限元模型进行加压分析,获得LNG储罐内、外罐罐壁的应力分布和变形规律;3.系统地介绍了自然风的基本特性和规范中关于风荷载的参数,利用ANSYS10.0中的APDL语言编写LNG储罐周向风压分布,采用ANSYS静态分析法对LNG储罐外罐有限元模型施加周向风压,获得LNG储外罐罐壁在静风风压作用下的应力分布和变形规律;更多还原

【Abstract】 Liquefied Natural Gas (hereinafter referred to as LNG) has the features of convenient transport and storage, safety use. In the past few decades, the world LNG consumption has a substantial increase, all countries put LNG as a clean fuel with low emissions to promote them. LNG tank is the important equipment in storage, use of LNG tank. There has been a lot of research results abroad and many of them have been applied to engineering practice, but for mechanical properties and deformation of inside and outside wall of the LNG storage tank under static loads is not perfect, meanwhile, structural designers also have an urgent need for internal force and deformation of LNG tanks under a variety of static loads. Therefore, we shoud have an in-depth study of mechanical properties of LNG storage tank.In this paper, the actual project has been researched, existing finite element software ANSYS has been used for the static load analysis of the LNG storage tank, the mechanical properties and deformation under different load has been researched, so as to provide a reliable design basis for calculation and analysis. The main contents include:1.The development of large LNG storage tanks, structural forms, their development at home and abroad and study conditions has been brief introduced. The features, functions and analysis steps of ANSYS10.0 finite element software has been simple introduced, LNG storage tanks has been reduced to shell problems, and then selecting appropriate units, using the finite element software to establish the finite element model of inside and outside wall of LNG tank;2.The method of calculation of the tank wall stress that "short cylindrical shell Law", "long cylindrical shell Law" has been introduced, and a new combination of cylindrical shell method that reference to the U.S. API650 (American Petroleum Institute Standard)tank wall thickness design methods, combine with the stress distribution anchorage tank also be introduced. Static analysis of ANSYS has been used to pressure the finite element model of inside and outside wall of LNG tank analysis, obtain stress distribution and deformation;3.The basic characteristics of natural wind and the specification of parameters on the wind load has been systematic introducted, APDL language of ANSYS10.0 has been used to program the circumferential pressure distribution of the LNG storage tank, Static analysis of ANSYS has been used to pressure the finite element model of outside wall of LNG tank analysis, obtain stress distribution and deformation.更多还原