- 摘 要
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張 恒1， 謝 劍1,2
（1天津大學建筑工程學院，天津300072；2 濱海土木工程結(jié)構(gòu)與安全教育部重點實驗室（天津大學），天津300072）[摘要] 為分析大型LNG低溫儲罐的振動特性，根據(jù)實際工程情況分為空罐和滿罐兩種工況，利用ANSYS軟件對處于空罐和滿罐兩種狀態(tài)下的儲罐分別進行了合理建模和模態(tài)分析。從理論分析出發(fā)，考慮了流固耦合問題，較為精確地分析了兩種工況下的儲罐的自振特性。結(jié)果表明：液體的存在使得儲罐的固有頻率降低；在滿罐情況下，液體對于低階頻率的影響大于對高階頻率的影響。為儲罐的安全使用提供了可靠的依據(jù)，并為進一步的動力響應(yīng)分析打下了基礎(chǔ)。
[關(guān)鍵詞] LNG儲罐；模態(tài)分析；流固耦合；動力響應(yīng)
中圖分類號：TU378.7 文獻標識碼：A 文章編號：1002-848X(2011) S2-0123-04Modal analysis of large-sized LNG low-temperature tanks
Zhang Heng1, Xie Jian1,2
(1 School of Civil Engineering, Tianjin University, Tianjin 300072, China; 2 Key Laboratory of Coast Civil Structure Safety ( Tianjin University), Mirustry of Education, Tianjin 300072, China)Abstract: As a large special structure, the seismic response analysis of tanks has profound strategic significance. In order to analyze vibration properties of large-sized LNG low-temperature tanks, modal analysis of tanks under the conditions of the slack tank and fullliquid state were performed through reasonable modeling by ANSYS. Beginning with the theory of fluid-solid coupling, the free vibration properties of tanks under the two conditions were analyzed precisely. The result shows that, in the full liquid state, the tank's free vibration is lower. In the full liquid state, the influence of the liquid on the low-frequency vibration is more apparent. This method has provided the reliable basis for the safety using of tanks, and has built the base of the further dynamic response analysis.
Keywords: LNG tanks; modal analysis; fluid-solid coupling; dynamic response
