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对不同场地条件下,不同周期的基础隔震结构在水平双向和单向地震作用下的隔震支座位移进行了对比分析,表明水平双向地震作用下隔震支座的总位移均明显大于水平单向地震作用下的支座位移,其比值的平均值为1.187,因而,在简化设计中确定基础隔震结构隔震支座位移时,可将水平单向地震作用下的隔震支座位移增大20%,以考虑水平双向地震作用对基础隔震结构隔震支座位移的影响。
Under different site conditions, the displacement of the base-isolated structures with different periods under horizontal bi-directional and unidirectional earthquakes are contrastively analyzed, which shows that the total displacement of the base-isolated bearings under horizontal bi-directional earthquakes are significantly greater than the horizontal The displacement of bearing under unidirectional earthquake is 1.187. Therefore, when determining the displacement of isolated bearing of base-isolated structure in simplified design, the displacement of isolated bearing under horizontal unidirectional earthquake can be displaced Increase 20%, in order to consider the impact of horizontal two-way earthquake on the displacement of base isolation structure isolation bearings.