LNG
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CHENG Xudong1 , SUN Lianfang1 , MA Hong2 , HAN Mingyi1 , ZHANG Rulin1
mal stress to LNG storage tank dome, which leads to concrete cracking and seriously affects the durability of the dome. An lation results were compared with the field test results. The temperature field and the structure were coupled by considering ing were estimated. Furthermore, the sensitivity of the parameter was analyzed. The results show that a great temperature difference between the inside and the outside of the dome is generated in the process of concrete pouring, which will cause a stress, and it will make the edge of dome produce meridian cracks along the circumferential direction. Types of cemen the results of thermal stress. Keywords: LNG storage tank; hydration heat; temperature field; thermal stress; concrete cracking
Thermal stress and crack distribution of concrete dome of spherical LNG storage tank
(1 . College of Pipeline and Civil Engineering in China University of Petroleum, Qingdao 266580, China; Abstract : During the construction process of large-scale LNG storage tanks, the hydration heat of cement causes a great therand the temperature field in tank dome was determined in the process of segmented pouring of concrete, the numerical simuconcrete creep and age effects, the distributions of thermal stress and crack were determined, and the risks of concrete crack2 . China Petroleum Engineering Southwest Company, Chengdu 610041, China)
LNG 储罐球形混凝土穹顶的热应力及裂缝分布 一
程旭东1 , 孙连方1 , 马 红2 , 韩明一1 , 张如林1
2. 中国石油集团工程设计有限责任公司西南分公司,四川成都 610041 ) 摘要:对于大型 LNG 储罐,其穹顶因水泥水化热产生较大的热应力,引起混凝土开裂,严重影响储罐的耐久性㊂ 以某 大型 LNG 储罐穹顶为研究对象,采用 ADINA 有限元软件建立精细化的有限元模型,模拟 LNG 储罐穹顶分段浇筑过 对混凝土穹顶的温度场和应力场进行耦合计算,得到穹顶的热应力分布及裂缝开展情况, 对穹顶混凝土开裂风险进 第一浇筑带的热应力明显比其他浇筑带大,环向热应力大于经络向热应力, 将使穹顶边缘产生沿环向分布的经络向 温度裂缝;水泥种类对穹顶热力分析结果有很大的影响㊂ 中图分类号:TE 821 文献标志码:A 版, 2015,39(5) :130-136. 130-136. 关键词:LNG 储罐; 水化热; 温度场; 热应力; 混凝土裂缝 引用格式:程旭东,孙连方,马红. LNG 储罐球形混凝土穹顶的热应力及裂缝分布[ J] . 中国石油大学学报:自然科学 CHENG Xudong, SUN Lianfang, MA Hong, et al. Thermal stress and crack distribution of concrete dome of spherical LNG storage tank during construction[ J] . Journal of China University of Petroleum ( Edition of Natural Science) , 2015,39(5) : 程中的早期温度场分布,并将数值计算结果与现场测试结果进行对比; 数值分析时考虑了混凝土徐变及龄期效应, 行评估,进而对参数的敏感性进行分析㊂ 结果表明:穹顶内外在混凝土浇筑过程中产生温差较大, 导致巨大热应力; ( 1. 中国石油大学储运与建筑工程学院,山东青岛 266580 ;
2015 年 第 39 卷 中国石油大学学报( 自然科学版) Vol. 39 No. 5 第 5 期 Journal of China University of Petroleum Oct. 2015 文章编号:1673-5005(2015)05-0130-07 doi:10. 3969 / j. issn. 1673-5005. 2015. 05. 018
