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以15×104m3储罐为例,应用ADINA有限元程序及《规范》算法对其进行了模态分析。结果表明,有限元法与规范近似算法计算的模态比较接近,15×104m3储罐液固耦合振动低频的振动形式比较丰富,以cosnθ,sinnθ型梁式振动为主;液体晃动低频的振动形式较单一,为cosnθ,sinnθ型梁式振动;储罐液固耦合频率对地基刚度变化敏感,液体晃动频率对储液高度变化敏感。
Taking a 15 × 104m3 tank as an example, modal analysis was carried out using the ADINA finite element program and the “canonical” algorithm. The results show that the finite element method is close to the model calculated by the canonical approximation algorithm, and the low-frequency vibration modes of liquid-solid coupling vibration of 15 × 104 m3 storage tank are relatively abundant. The vibration modes of cosnθ and sinnθ type are mainly vibrations; Which is more sensitive to the vibration of cosnθ and sinnθ type beam. The liquid-solid coupling frequency of tank is sensitive to the change of foundation stiffness, and the frequency of liquid sloshing is sensitive to the change of reservoir height.