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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 finite 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 benefit 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 benefit. In addition, the variation in second shape factor of interbed rubber cradle has very small effect on the damping ratio. The study results are significant 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.
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收稿日期:2014-6-9;改回日期:2015-4-27。
基金项目:中央高校基本科研业务费专项资金项目“桩-土-隔震层-LNG 储罐体系的地震响应简化计算方法研究”,15CX02044A;国家自然科学基金项目“土体-基础-罐体-液体系统地震响应规律及简化分析方法研究”,51408609。
作者简介:管友海,副教授,1975年生,2006年博士毕业于中国海洋大学环境工程专业,现主要从事结构抗震与城市防灾信息化等相关技术的研究工作。Tel:13864220186, Email:guanyouhai@upc.edu.cn