球形储罐基于性能的隔震设计

Performance-based Seismic Design of Spherical Natural Gas Tank

以都江堰市的一个钢制球形储罐的抗震设计为背景,讨论了目前国内外球罐提高抗震能力的常用方法。一类是通过调整球罐本身的结构形式和改变支撑体系的尺寸和数量,另一类就是在球罐上增设减(隔)震耗能装置。在对这些方法进行粗略讨论的基础上,采用基础隔震理念,应用于都江堰市一种使用广泛的球罐的减震设计。通过球罐上面一些关键部位动力响应控制指标的选取,考察了隔震前后这些指标的变化,表明通过隔震措施能使球罐结构的抗震性能大大改善。本文的隔震设计分析过程可供类似球罐的隔震设计参考。

In this paper, the seismic design for a steel spherical tank in Dujiangyan City is taken as the background for discussing the reinforcement of tank in the earthquake, and the methods of enhancing the seismic capacity in steel spherical tank nowadays are discussed. The basic idea is divided into two categories： one is adjusting the spherical form or changing the size and number of support system ; the other is adding the devices of energy-dissipated in structure. These methods are generally summarized, and then, the idea of adding rubber isolation in the structure is proposed in order to improve the seismic performance. Combined with the project of spherical tank in Dujiangyan City, the method of adding rubber isolation in the structure is used for analysis and comparison, the data in the original structure with the isolated structure are compared. The results show that the seismic behavior of spherical tank is significantly improved by base isolation. The analytic process in this article may take the example of the similar projects.