大型原油储罐有限元分析建模的新方法  

New modeling method for finite element analysis of large oil storage tanks

作　　者：陈志平[1] 葛颂[1] 沈建民[1] 蒋家羚[1] 

机构地区：[1]浙江大学化工机械研究所,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2006年第6期977-981,共5页Journal of Zhejiang University：Engineering Science

基　　金：浙江省自然科学基金资助项目(M503136)

摘　　要：为了准确计算大型原油储罐的底板应力,提出了一种有限元分析的建模方法.初步分析了弹簧杆模型与弹性地基接触模型的差异,选取接触单元模拟地基-罐底板的相互作用.比较了罐底板上表面径向应力理论解、有限元计算应力结果与实测应力数据的误差,并结合油罐钢筋混凝土环梁和弹性地基的沉降特点,提出将两种地基的沉降量差作为有限元建模的边界条件.通过试算得到了地基的弹性模量和沉降差估算值.结果表明,理论估算结果与基础沉降监测值吻合很好,该方法可以准确地模拟油罐底板的应力,还可以预测在用大型油罐的安全性.To accurately calculate the stress on the bottom plate of large oil storage tank, a new finite element modelling method was proposed. After the differences between the spring beam model and the elastic foundation contact model were analyzed preliminarily, the interaction between the foundation and the tank bottom plate was simulated by adopting the contact element. The errors among the theoretical values, finite element analysis （FEA） calculation values and the testing values of the radial stress on the bottom plate upper surface were also compared. Based on the settlement feature of the armored concrete ring wall and the elastic foundation, the settlement difference between the two different foundations was used as the boundary conditions of the FEA model. The elastic modulus of the foundation and the difference value of the settlement were estimated by pilot calculation. The results show that the theoretical values agree well with the monitored foundation settlement values. The proposed method can exactly simulate the oil-tank bottom-plate stress and predict the safety of the large oil tank in service.

关 键 词：大型原油储罐 有限元分析 建模 接触 弹性地基 

分 类 号：TE972.1[石油与天然气工程—石油机械设备] TB24[一般工业技术—工程设计测绘]