中国石油大学学报（自然科学版）Issue(5)：130-136,7.DOI:10.3969/j.issn.1673-5005.2015.05.018
LNG储罐球形混凝土穹顶的热应力及裂缝分布
Thermal stress and crack distribution of concrete dome of spherical LNG storage tank
摘要
Abstract
During the construction process of large-scale LNG storage tanks, the hydration heat of cement causes a great ther-mal stress to LNG storage tank dome, which leads to concrete cracking and seriously affects the durability of the dome. An improved finite element model for a large-scale LNG storage tank was established using the finite element program ADINA, and the temperature field in tank dome was determined in the process of segmented pouring of concrete, the numerical simu-lation results were compared with the field test results. The temperature field and the structure were coupled by considering concrete creep and age effects, the distributions of thermal stress and crack were determined, and the risks of concrete crack-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 great thermal stress. The thermal stress of the first pouring is greater than others, the hoop stress is greater than the meridian stress, and it will make the edge of dome produce meridian cracks along the circumferential direction. Types of cement have an important effects on the results of thermal stress.关键词
LNG储罐/水化热/温度场/热应力/混凝土裂缝Key words
LNG storage tank/hydration heat/temperature field/thermal stress/concrete cracking分类
能源科技引用本文复制引用
程旭东,孙连方,马红,韩明一,张如林..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（自然科学版）,2015,(5):130-136,7.基金项目
国家自然科学基金项目(51408609) （51408609）
山东省自然科学基金项目(ZR2012EEL23) （ZR2012EEL23）
中央高校基本科研业务费专项(15CX05004A) （15CX05004A）
