隔震LNG储罐的地震响应及经济分析

Seismic response and economic analysis of shock-isolated LNG storage tank

以山东青岛市董家口某16×104 m3大型LNG预应力混凝土储罐为研究对象,利用ADINA建立大型LNG储罐的有限元模型,采用夹层橡胶垫作为储罐的隔震装置,对隔震储罐进行地震响应分析,对比分析隔震前后储罐内外罐的地震响应,考虑夹层橡胶支座参数第二形状系数对储罐地震响应的影响,并对LNG储罐隔震后的经济效益进行初步分析。研究结果表明:夹层橡胶支座即隔震装置不但能够有效地控制储罐内外罐的地震响应,而且可以产生良好的经济效益,但是,夹层橡胶支座第二形状系数的改变对减震率的影响很小。研究成果对于更详细地了解隔震储罐的地震响应具有重要的工程意义,且对夹层橡胶支座的生产参数的选择和设定也具有很好的借鉴意义。

In this paper, taking the 16×104 m3 large prestressed concrete tank in Dongjiakou of Qingdao, Shandong Province, as an example, seismic responses of inner and outer layers of the tank before and after shock isolation are analyzed with a fi nite element model of large LNG storage tank. This model is established using ADINA, with interbed rubber blanket as the shock isolation tool for the tank. The effects of second shape factor of interbed rubber cradle parameter on the seismic response are considered. Moreover, simple preliminary analysis is made on the economic benefi t after shock isolation. The study results show that the interbed rubber cradle, i.e., the shock isolation tool, can not only effectively control the seismic responses of inner and outer layers of the tank, but also produce favorable economic benefi t. In addition, the variation in second shape factor of interbed rubber cradle has very small effect on the damping ratio. The study results are signifi cant for thoroughly understanding the seismic response of shock-isolated storage tank, and also favorable for the selection and setting of production parameters of interbed rubber cradle.