（1 天津大学建筑工程学院土木工程系，天津 300072；2 天津大学滨海土木工程结构与安全教育部重点实验室，天津 300072）

[摘要]  运用ADINA有限元分析软件建立160000m³大型LNG储罐模型。考虑液固耦合效应，对储罐内外罐的自振特性进行分析并与理论公式计算值比较。结果表明有限元方法能够准确模拟计算LNG储罐的外罐模态以及内罐的耦联、晃动模态。在此基础上对LNG储罐进行地震响应分析，得到了储罐加速度及位移峰值沿罐壁高度变化曲线，罐壁的应力分布，以及储罐基底剪力、倾覆弯矩，储液晃动波高、动液压等重要指标。初步揭示了LNG储罐的破坏机理，并为储罐的抗震设计提供重要的参考依据。

[关键词]  LNG储罐；液固耦合；自振特性；地震响应

中图分类号：TU352.11      文献标识码：A      文章编号：1002-848X（2013）S1-1273-05

作者简介：谢剑（1974—），男，副教授，博士，E-mail: xiejian@tju.edu.cn

Dynamic characteristics and nonlinear seismic response analysis of large-scale LNG storage tanks

Xie Jian1, 2, Wang Weina¹, Li Bo ¹

（1 Department of Civil Engineering, Tianjin University，Tianjin 300072, China;2 Key Laboratory of Coast Civil Structure Safety, Ministry of Education, Tianjin University ,Tianjin 300072, China）

Abstract：A finite element model of 160000 m³ LNG storage tanks was established by using ADINA. Considering the liquid-solid coupling effect, the dynamic characteristics had been studied and compared with the theoretical formula values. The results showed that the finite element analysis method could accurately calculate the inner-tank’s basic vibration model of liquid-solid coupling and sloshing, as well as the out-tank’s basic vibration model. Based on this, the seismic response was studied and obtained some important indexes, such as acceleration and displacement envelope curve along height direction, the stress distribution, and the base shear, overturning moment, the sloshing wave height and hydrodynamic pressure. The analysis results preliminarily revealed the LNG tank’s damage mechanism, and provided an important reference for the seismic design.

Keywords: LNG tank; liquid-solid coupling; natural vibration properties; seismic response