摘要
为了准确获得地震发生后LNG储罐吊顶各部分结构的响应加速度,研究采用超单元模拟吊杆进行吊顶结构地震响应分析方法。采用子结构技术建立吊杆超单元,对包含超单元的吊顶进行模态分析,扩展模态阵型确保有效模态质量达到95%以上,利用模态计算结果及场地地震动参数进行响应谱分析,确定吊顶的地震响应加速度。结果结果表明:采用超单元模拟吊杆进行吊顶模态分析时,能够快速获取吊顶的主阵型,并且在1000阶模态范围内即可保证有效模态质量满足规范要求,采用子结构技术能够高效完成吊顶地震响应分析。研究结果可为LNG储罐吊顶结构安全性评价提供参考。
In order to accurately obtain the response acceleration of each part structure in the suspended ceiling of LNG storage tank after the earthquake,the method of seismic response analysis on the suspended ceiling structure of LNG tank using the super-element simulated hanger rods was adopted.The substructure technology was used to establish the hanger rods super-element,then the modal analysis on the suspended ceiling including the super-element was carried out,and the modal shapes were expand to ensure that the effective modal mass reached 95%or above.The modal calculation results and site seismic spectrum parameters were combined for response spectrum analysis,so as to determine the seismic response acceleration of the suspended ceiling.The results show that the main modal shape of the suspended ceiling can be quickly obtained in the modal analysis by using the super-element simulated hanger rods,and the effective modal mass can meet the specification requirements within 1000 order modal range.The seismic response analysis of suspended ceilings can be completed efficiently by using the substructure technology.The research results can provide reference for the safety evaluation for the suspended ceiling of LNG tanks.
作者
俞进
尤学刚
张克政
YU Jin;YOU Xuegang;ZHANG Kezheng(China National Offshore Oil Corporation,Beijing 100010,China;CNOOC Gas and Power Group Co.,Ltd.,Beijing 100028,China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2023年第S02期64-68,共5页
Journal of Safety Science and Technology
关键词
大型LNG储罐
吊顶
子结构技术
超单元
模态分析
响应谱分析
large LNG tank
suspended ceiling
substructure technology
super-element
modal analysis
response spectrum analysis
