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为了研究15×104m3立式储罐隔震设计影响因素,采用有限元数值仿真技术,分析了隔震刚度、浮顶质量、储液密度、罐壁厚度、罐壁的材料弹性模量、储液高度与罐半径比值对储罐的晃动频率和液固耦合频率的影响并与时程分析对照。结果表明:储罐液固耦合振动频率对隔震刚度敏感,隔震刚度较低时,液固耦合刚度的下降,使基底剪力变小;隔震刚度对储罐的液体晃动频率的影响不大,在一定的隔震周期范围内,波高无放大效应;隔震设计时,浮顶的影响可忽略;储液高度与储罐半径比对储罐的液固耦合频率和晃动频率影响较大,隔震设计时存在优化段;储液密度、罐壁厚度、材料弹性模量,隔震设计时可不考虑其影响,进行地震动台实验时,可考虑用其他材料代替钢材,不影响分析结果。
In order to study the influencing factors on the design of 15 × 104m3 vertical storage tank isolation, finite element numerical simulation technology is used to analyze the seismic isolation stiffness, floating roof mass, liquid storage density, tank wall thickness, material elastic modulus of tank wall, The influence of the ratio of height to tank radius on tank shaking frequency and liquid-solid coupling frequency is compared with the time-history analysis. The results show that the liquid-solid coupling vibration frequency of the tank is sensitive to the isolation stiffness. When the isolation stiffness is low, the decrease of the liquid-solid coupling stiffness decreases the shear force of the substrate. The influence of isolation stiffness on the liquid oscillation frequency of the storage tank is not affected Large, the wave height has no amplifying effect within a certain period of isolation cycle; the influence of the floating roof can be neglected when the isolation design is made; the liquid-solid coupling frequency and the shaking frequency of the storage tank greatly influence the storage height and the storage tank radius ratio , There is an optimized section of isolation design; liquid density, tank wall thickness, elastic modulus of materials, isolation design can not consider the impact of ground shaking table experiment, you can consider other materials instead of steel, does not affect the analysis results .