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对于基础隔震大型立式储罐的地震响应分析问题,考虑土壤与结构的相互作用和储罐的摆动效应,从流体速度势理论出发,结合储罐储液与罐壁的边界条件,建立液体运动势函数和相应的基底剪力、倾覆力矩及波高的理论表达式;并依据剪力和弯矩等效的原理,建立了具有摆动效应的基础隔震储罐的力学简化模型,利用能量原理建立了考虑摆动效应的立式储罐隔震体系的运动方程。同时,以15万m~3大型储罐为例,进行了减震效应数值计算分析,并与无摆动效应的隔震体系的简化力学模型进行了比较分析。结果表明:大型储罐采用基底隔震装置,可以有效地降低储罐的基底剪力,对液体晃动波高的控制效果较差,建议在高烈度区,满足晃动波高的前提下,储罐上部结构可以降低烈度进行设计。
Considering the interaction between soil and structure and the oscillating effect of storage tank, the seismic response analysis of large vertical storage tank with basement isolation is taken into account. Based on the fluid velocity potential theory and the boundary conditions of storage tank and tank wall, the liquid Motion potential function and corresponding theoretical expressions of base shear force, overturning moment and wave height. Based on the principle of equivalent shear force and moment, a mechanical simplified model of base-isolated tank with wobble effect is established. By using energy principle The equations of motion of a vertical tank seismic isolation system with swinging effect are established. At the same time, taking the 150,000 m ~ 3 large storage tank as an example, the numerical analysis of the damping effect was carried out and compared with the simplified mechanical model of the isolation system with no wobble effect. The results show that the base isolation device of large storage tank can effectively reduce the base shear of the storage tank and has a poor control effect on the wave height of liquid sloshing. It is suggested that under the premise of high intensity zone and shaking wave height, Can reduce the intensity of the design.