引用本文:
【打印本页】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览次   下载 本文二维码信息
码上扫一扫!
分享到: 微信 更多
Thermal stress and crack distribution of concrete dome of spherical LNG storage tank
CHENG Xudong1, SUN Lianfang1, MA Hong2, HAN Mingyi1, ZHANG Rulin1
(1.College of Pipeline and Civil Engineering in China University of Petroleum, Qingdao 266580, China;2.China Petroleum Engineering Southwest Company, Chengdu 610041, China)
Abstract:
During the construction process of large-scale LNG storage tanks, the hydration heat of cement causes a great thermal 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 simulation 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 cracking 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.
Key words:  LNG storage tank  hydration heat  temperature field  thermal stress  concrete cracking