【摘要】 为了给LNG储罐基础隔震设计提供简化方法,结合LNG储罐基础隔震工程设计的需求,基于反应谱设计理论,建立了LNG储罐考虑质点弹簧阻尼参数和不考虑质点弹簧阻尼参数的两种简化力学模型,给出了用于LNG储罐反应谱设计的地震影响系数曲线及LNG储罐基础隔震设计反应谱基本步骤,并选取1.6×105m3LNG储罐进行反应谱设计研究和时程分析法补充验算.结果表明:基于反应谱理论的简化模型是可行的,其与传统结构体系比较,能够有效降低基底剪力和罐壁倾覆弯矩,计算结果可取时程法的平均值和反应谱法的较大值,设计内罐罐壁时可仅考虑柔性脉冲质点(不考虑底板不对称振动)和对流质点作用的基底剪力和罐壁倾覆力矩,而设计基础时要考虑外罐质点、柔性脉冲质点(包含底板不对称振动)及对流质点作用的基底剪力和基底弯矩.更多还原

【Abstract】 To provide base isolation design simplified method of LNG storage tank,combining base isolation engineering design requirement of LNG storage tanks,based on the response spectrum design theory,considering and not considering mass spring damping parameters 2 kinds of LNG storage tank simplified mechanical models were established.Seismic effect coefficient curve for the LNG tank response spectrum design and response spectrum basic steps of LNG storage tank base isolation were presented.Selecting 1.6 × 10 5 m 3 LNG tank response spectrum and time history analysis method supplementary checking,the results showed that: compared with the traditional structure,it could effectively reduce the base shear and the tank wall overturning moment,the simplified model was feasible based on response spectrum theory,the calculation results desirable timehistory method average value and response spectrum method a larger value,tank design can only consider flexible impulse mass and the convective mass contribution to the base shear and tank wall overturning moment,the foundation design should consider all mass contribution to the base shear and base moment.更多还原