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立式钢制圆柱形储罐向着大型化和浮放式发展,其动力特性参数,如结构的固有频率和固有振型,在地震工程中经常被使用,以15×104m3储罐为例,应用ADINA有限元程序,采用弹簧单元来模拟地基,考虑液固耦合效应对其进行了模态分析。结果表明:采用弹簧单元来模拟地基进行储罐的分析时,有限元与规范近似算法比较接近;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比较单一,即cosnθ、sinnθ型梁式振动;液固耦合振动频率对地基刚度最为敏感,储液高度与储罐高径比次之,受罐壁厚度的影响比较小;液体晃动频率对罐壁厚度和地基刚度不敏感,对储液高度与高径比则比较敏感。
Vertical steel cylindrical tanks toward large-scale and float development, the dynamic characteristics of parameters, such as the natural frequency of the structure and natural mode, often used in seismic engineering to 15 × 104m3 tank, for example, the application ADINA finite element program, the use of spring elements to simulate the foundation, considering the liquid-solid coupling effect of its modal analysis. The results show that the finite element method is close to the standard approximation algorithm when the spring unit is used to simulate the foundation tank analysis. The vibration forms of the liquid-solid coupling vibration of 15 × 104m3 storage tank are relatively abundant. Taking cosnθ, sinnθ beam vibration as The vibration modes of low-frequency vibration of the main rock and liquid are relatively single, namely the cosnθ, sinnθ-type beam vibration; the frequency of liquid-solid coupling vibration is the most sensitive to the foundation stiffness, the second is the height of the storage fluid and the height of the storage tank, The frequency of liquid sloshing is not sensitive to the thickness of the tank wall and the stiffness of the foundation, but it is sensitive to the height-height-diameter ratio of the liquid.