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摘要随着石油化工行业的不断发展，储罐的需求量不断增加。储罐的施工方法通常主要有正装法和倒装法两种，对于容量大于20,000立方的浮顶罐，国内一直局限于水浮法正装法和角手架正装法，中小容量的储罐采用倒装法。相对正装法施工中的大量高空作业，倒装法具有低空作业、操作方便、安全性高的优点。随着储罐向大型化发展，研发大型储罐的倒装施工工艺，已经成为一种必然趋势。本文在全面回顾国内外储罐倒装法施工工艺及发展现状的基础上，选择倒装法施工提升过程中，液压提升所需要的支撑片为研究对象，采用ANSYS软件建立储罐焊接支撑片模型，并进行有限元分析。主要分析在吊装过程中支撑片的应力分布，确定该焊接支撑片能否安全可靠确保施工质量。得到该支撑片的应力分布云图，及应力的最大位置。从图中可以看出支撑片上应力的分布是不均匀的，而且在焊缝周围应力很大。关键词：储罐倒装法；支撑片；有限元分析AbstractWith the continuous development of Petrochemical industry，Ever-increasing demand for storage tank. Tank construction method is usually the main method is loaded and two flip-law, for a capacity of more than 20,000 cubic meters of floating roof tank, has been confined to the domestic water float angle is hand equipment and aircraft are fitted law, the use of small and medium-sized tank capacity inversion method. Construction equipment is a relatively large number of high-altitude operation, with a low flip-law operation, easy to operate, the advantages of high security. With the tank to the large-scale development of large storage tanks of the flip-construction process, has become an inevitable trend. In this paper, on the basis of a comprehensive review of domestic and foreign tank flip chip construction technology and the development of the status quo , choice of flip-law to enhance the process of construction, hydraulic lifting of the films required for study, using ANSYS software to support the establishment of tank welding chip model and finite element analysis carried out. The main analysis the support films stress distribution in the process of lifting, to determine whether the support films can to ensure the construction quality of secure and reliable.keywords: tank flip chip; support film; Finite Element Analysis25目 录1绪论11.1研究意义11.2研究目的11.3研究现状22理论基础32.1大型储罐发展概况32.210万立方浮顶储罐施工简介42.2.1概述42.2.2 施工方法42.3倒装法施工工艺62.3.1 液压提升原理及方法62.4有限元理论基础82.4.1 有限元法的基本思想82.4.2 有限元法的分析过程82.4.3 有限元的优越性82.5ANSYS软件92.5.1 ANSYS的功能92.5.2 ANSYS的特点102.5.3 ANSYS软件的结构103有限元分析133.1建立模型133.2划分网格163.3施加约束与载荷183.4结果分析183.5结论21致 谢22参考文献23储罐倒装法施工提升过程中支撑片受力有限元分析1 绪论1.1 研究意义随着石油化工行业的不断发展，储罐的需求量不断增加。储罐的施工方法通常主要有正装法和倒装法两种，对于容量大于20,000立方的浮顶罐，国内一直局限于水浮法正装法和脚手架正装法，中小容量的储罐采用倒装法。倒装法是目前大型储罐安装施工的常用方法，其工艺及配套设备有很多种，但其中最先进、最可靠、最具生命力的当属倒装法液压提升技术1。大型储罐倒装法（或钢桅杆、通讯塔和钢尖塔等）用液压提升施工成套技术是以SQD-160-100s.f松卡式千斤顶（承载力16t，液压行程100mm）为主体配以不同型号的液压泵站和液压管路系统等配件，组成大型储罐（或钢桅杆、通讯塔和钢尖塔等）液压提升施工成套设备，可适用于大型储罐（拱顶罐、浮顶罐和内浮顶罐、钢桅杆、通讯塔和钢尖塔等）的提升施工。正装法是自罐底向上逐层施工，最后装上罐顶，这种方法必须进行高空作业，而且全过程均需大吨位吊车配合施工，还需要搭设吊车或悬挂脚手架。倒装法的施工顺序是：罐底、罐顶、上层（第一层）壁板、逐层提升中间各层壁板、下层壁板。这种方法全部地面作业，不仅安全可靠、工效高、而且节省了吊车和脚手架费用2。随着近年来计算机技术广泛应用与发展，使有限元分析软件在工程应用与分析中得到了广泛的应用，并且具有其独特的优势。由以上可见，采用有限元进行受力分析具有极大的潜在经济效益和社会效益，对机械工业与科学技术的发展有重大意义。1.2 研究目的有限元分析（FEA，Finite Element Analysis）是用较简单的问题代替复杂问题后再求解。它将求解域看成是由许多称为有限元的小的互连子域组成，对每一单元假定一个合适的(较简单的）近似解，然后推导求解这个域总的满足条件(如结构的平衡条件），从而得到问题的解。这个解不是准确解，而是近似解，因为实际问题被较简单的问题所代替。由于大多数实际问题难以得到准确解，而有限元不仅计算精度高，而且能适应各种复杂形状，因而成为行之有效的工程分析手段3。受力分析的研究方法大致可以分为两类：实验法与科学分析法(即理论法)。完全采用工艺实验的方法研究结构件受力情况，不但成本很高，而且周期也会很长，需要投入大量的人力、物力、财力。而采用ANSYS有限元软件进行分析与研究具有其他研究方法无法比拟的优点。本课题建立储罐焊接支撑片模型，分析在吊装过程中支撑片的应力分布，确定该焊接支撑片能否安全可靠确保施工质量。1.3 研究现状目前的油罐越来越向大型化方向发展，因为储油罐单罐容积越大，单位容积的钢材耗用指标越低，相同储量的油库成本越低，同时罐区总占地面积也越小，方便管理，可以降低总成本。1962年美国芝加哥桥梁公司首先建成10104m3浮顶油罐，直径87米，高约21米；1964年壳牌石油公司在欧洲建成10104m3浮顶油罐；日本发展得比较晚，但是近年来迅速赶上，日本在1965年建成10104m3浮顶油罐，1971年建成16104m3浮顶油罐，直径109米，高17.8米；沙特阿拉伯也已成功建造了20104m3浮顶油罐，其直径高达110米，高22.5米4。 1985年中国从日本引进第一台10104m3浮顶油罐，到目前已经建成10104m3大型浮顶油罐几十台。2003年在广东茂名建成了12.5104m3罐，2004年在江苏仪征建成了15104m3罐。这些大型罐的设计大多参照美国的API650标准或JIS B 8501标准。这类大型罐的设计，我国还处于起步阶段，正在不断摸索，有许多方面需要研究。保障油罐的安全是目前最重要的问题，目前的设计标准