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一种新的大型LNG储罐钢穹顶稳定性分析方法
程旭东1,甄聪1,艾金兴1,高思远1,韩明一2
(1.中国石油大学(华东)储运与建筑工程学院,山东青岛 266580;2.廊坊中油朗威工程项目管理有限公司,河北廊坊 065000)
摘要:
大型LNG储罐钢穹顶由蒙皮板和单层肋环型网壳焊接而成,因其结构特殊性,目前中国在进行大型LNG储罐穹顶稳定性分析时无相关规范可以依循,多参照单层网壳规范进行设计,钢穹顶可能存在局部失稳的风险。提出一种新的钢穹顶稳定性分析方法,即将带蒙皮板网壳结构等效为单层网壳结构进行稳定性分析。该方法基于保证等效前后截面面积、抗弯刚度相等和等效后异型梁局部稳定的原则,通过将一定范围内蒙皮板截面换算成异型梁上翼缘截面来考虑蒙皮板对肋、环梁刚度的贡献。利用数值模拟,对比等效前后结构失稳模式、稳定极限承载力及稳定安全系数,验证等效方法的合理性。结果表明:新的LNG钢穹顶稳定性分析方法能合理考虑蒙皮板对结构空间整体刚度的增强作用,减缓钢穹顶提前失稳程度,同时可避免产生错误的蒙皮板屈曲模态。
关键词:  液化天然气储罐  钢穹顶  等效截面方法  失稳模式  稳定极限承载力  安全系数
DOI:10.3969/j.issn.1673-5005.2022.02.018
分类号::TU 311.2
文献标识码:A
基金项目:山东省自然科学基金项目(ZR2020ME237)
A new stability analysis method for steel dome of large LNG storage tank
CHENG Xudong1, ZHEN Cong1, AI Jinxing1, GAO Siyuan1, HAN Mingyi2
(1.College of Pipeline and Civil Engineering in China University of Petroleum (East China), Qingdao 266580, China;2.China Petroleum Longway Engineering Project Management Company Limited, Langfang 065000, China)
Abstract:
The steel dome of the large LNG storage tank is welded by the roof panel and the ribbed-type reticulated shell. And there is no relevant code to refer in the stability analysis for the large LNG storage tank dome in China due to its structural particularity. Most of the designs refer to the code of the single-layer reticulated shell which may lead to the risk of local instability of the steel dome. Therefore, a new stability analysis method of the steel dome was proposed, in which the reticulated shell was equivalent to the single-layer one. Based on the principle of ensuring the equal section area, bending stiffness, and the local stability of the special-shaped beam after equivalence, the contribution of roof panel to the stiffness of beams was considered by converting the roof panel section into the upper flange section of special-shaped beam. The rationality of the analysis method was verified by numerical simulation, comparing the instability mode, stability ultimate bearing capacity and safety factor of the structure. The results show that the new stability analysis method can reasonably consider the enhancement of roof panel on the overall stiffness of structure, slow down the early instability degree of steel dome, and avoid the generation of wrong buckling mode of the roof plate.
Key words:  LNG storage tank  steel dome  equivalent section method  instability mode  stability ultimate bearing capacity  safety factor
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