- 摘 要
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（1 天津大學建筑工程學院土木工程系，天津 300072；2 天津大學濱海土木工程結構與安全教育部重點實驗室，天津 300072）
[摘要] 運用ADINA有限元分析軟件建立160000m3大型LNG儲罐模型。考慮液固耦合效應，對儲罐內外罐的自振特性進行分析并與理論公式計算值比較。結果表明有限元方法能夠準確模擬計算LNG儲罐的外罐模態(tài)以及內罐的耦聯(lián)、晃動模態(tài)。在此基礎上對LNG儲罐進行地震響應分析，得到了儲罐加速度及位移峰值沿罐壁高度變化曲線，罐壁的應力分布，以及儲罐基底剪力、傾覆彎矩，儲液晃動波高、動液壓等重要指標。初步揭示了LNG儲罐的破壞機理，并為儲罐的抗震設計提供重要的參考依據(jù)。
[關鍵詞] LNG儲罐；液固耦合；自振特性；地震響應
中圖分類號：TU352.11 文獻標識碼：A 文章編號：1002-848X（2013）S1-1273-05
作者簡介：謝劍（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
