大型石油储罐象足屈曲一种新预防方法.pdfVIP

学兔兔 第50卷第6期 机 械 工 程 学 报 VO1．50 NO．6 2014年 3月 JOURNAL OF MECHANICAL ENGINEERING Mar． 2014 DoI：lO．3901／JME．2014．06．022 大型石油储罐象足屈曲的一种新的预防方法水 陈志平 陈富财 杨立才 王 季 曹国伟 (浙江大学化工机械研究所 杭州 3 1 0027) 摘要：象足屈曲是大型石油储罐受到垂向冲击载荷后易发生的一种典型破坏形式。由于传统的提高大型油罐象足屈曲临界载 荷的方法存在某些不足，提出一种在储罐底部危险部位设置轻质加强圈用于防止象足屈曲的预防方法。依据弹性板壳理论， 对设置了加强圈的储罐变形进行完整的力学分析，获得油罐各圈壁板环向薄膜内力分布和径向位移的解析解，直观地建立起 加强圈设置高度和横截面积大小与罐壁径向位移间的关系；同时利用该解析解研究不同加强圈横截面积和设置高度对油罐壁 板危险区域的环向薄膜内力分布和径向位移的影响。结果表明，合适的加强圈横截面积大小和设置高度能有效地降低储油罐 壁板危险区域的环向薄膜内力和径向位移，提高油罐抵抗象足屈曲失效的能力。 关键词：大型石油储罐：象足屈曲；加强圈；板壳理论 中图分类号：TE972 A New Method to Prevent Elephant Foot Buckling on Tank Wall of Large Oil Storage Tanks CHEN Zhiping CHEN Fucai YANG Licai WANG Ji CAO Guowei (Institute of Process Equipment，Zhejiang University,Hangzhou 3 1 0027) Abstract：Elephant foot buckling is a classical failure mode of large oil storage tank under vertical impact load．There are many restrictions and weaknesses in traditional ways to improve elephant foot buckling critical load．So a new method that sets a light ring stiffener in dangerous zone near the tank’S boRom is presented to enhance resistance of the tank wall against elephant foot buckling． According to the elastic shell theory,comprehensive mechanical analyses of deformations of oil tank wall with ring stiffener are carried out．The analytic solutions of circunferential internal forces and deformations of oil tank wall are obtained，and the relation between ring stiffener’S height，cross sectional area and radial displacement of shells is built．Meanwhile，analysis calculation for the shell of large Oi1 storage tank is done．The effect that different cross sectional area and