【摘要】 为了给大型LNG储罐基础隔震设计提供理论和技术支撑,将混凝土外罐依据的剪切悬臂梁理论,钢制内罐依据的速度势理论,引入隔震层刚度和阻尼,建立了LNG储罐基础隔震体系的等效力学模型;应用Hamilton原理,推导了LNG储罐基础隔震体系运动方程,给出了地震响应的理论表达.针对160 000 m3大型LNG储罐进行数值分析,结果表明:除晃动波高外,基底剪力和倾覆弯矩减震效果明显;进行LNG储罐基础设计时,要考虑外罐的影响,而钢制内罐设计时,可以忽略外罐的影响;LNG储罐隔震设计时,要考虑隔震对晃动带来的影响,进行优化设计.更多还原

【Abstract】 To provide a theoretical and technical basis for base isolation of LNG storage tanks,based on the shear beam theory for the outer-concrete-tank and the velocity potential theory for the inner-steel tank,and by introducing isolation stiffness and damping,the equivalent mechanical model of LNG storage tank base isolation system was established,the movement equations of LNG storage tank base isolation system were derived according to Hamilton’s principle and the theoretical expression of seismic response were given.To 160 000 m3 large LNG storage tank,the numerical analysis results showed that,in addition to wave height,the base shear and overturning moment damping effect was obvious,the foundation design of LNG storage tank was necessary to consider the impact of outer-tank,however,when designing the inner-steel tanks,the impact of outer-tank could be ignored.It was necessary to optimize the design considering the influence of isolation on the sloshing of base isolation of LNG storage tanks.更多还原