海上LNG接收终端温度应力场有限元分析

FINITE ELEMENT ANALYSIS OF THERMAL AND STRESS FIELD FOR OFFSHORE LNG TANK

海上LNG接收终端是一种重力式箱形结构,直接坐落于海床上,内部储存大量低温液体,而外界环境温度相对较高,内外温差巨大,容易使结构产生裂缝,对安全有重大不利影响,因此,结构温度场及温度裂缝的影响不可忽略。文中运用有限元软件ABAQUS分析了LNG泄露工况下的结构的温度场及温度应力分布。计算结果表明:在LNG泄露工况下,结构中心隔墙都出现不同程度的开裂,且产生竖直裂缝,应在中心隔墙内配置水平预应力钢筋,抑制裂缝产生;结构内部围墙出现较大开裂,且产生水平裂缝,应在内围墙内配置竖直预应力钢筋,抑制裂缝产生。

The soffshore LNG tank is a gravity type box structure,directly located on the seabed,storaging large quantity of cryogenic liquid,and the external environment temperature is relatively high,so the temperature difference between inside and outside is great,It is easy to produce cracks and have a significant effect on the safety,therefore,the temperature cracks cannot be ignored. This paper uses the finite element software ABAQUS to analyze the temperature field of the structure. The results show that：the temperature stress had a great influent on the LNG tank,and the structure should have pre-stressed reinforcement to counter the effect of the temperature field.