不同类型场地对隔震储罐地震响应的影响  

Influence of different types of sites on seismic response of base-isolated liquid storage tank

作　　者：李扬[1] 李自力[1] 张艳[1] 

机构地区：[1]中国石油大学储运与建筑工程学院,山东东营257061

出　　处：《中国石油大学学报（自然科学版）》2008年第5期108-113,共6页Journal of China University of Petroleum(Edition of Natural Science)

摘　　要：利用精度高的四阶龙格库塔法求解橡胶基底隔震储罐的动力方程,探讨了场地因素对隔震储罐减震性能的影响,特别是对基底剪力、晃动波高、隔震支座位移3个重要响应参数的影响。研究表明:低隔震频率时储罐在4种场地上都取得良好隔震效果,场地越硬,减震效果越好,但有效隔震频率范围不一定越广。储罐减震效果提高需要付出隔震支座位移增大的代价。不同类型场地上储罐隔震后晃动波高都出现增大现象,Ⅰ类场地上波高变化剧烈但幅度很小,Ⅳ类场地上波高变化幅度最大。合理的支座阻尼比可以起到降低基底剪力、晃动波高和支座位移的作用。除了第Ⅱ类场地,2 000 m3罐减震效率高于50 000 m3罐。在设计储罐隔震系统时,建议根据罐体高径比综合考虑参数响应的影响,优化配置隔震频率和阻尼比等设计参数。The lumped mass model of isolated tank was solved by the fourth-order Rungekutta method. The influences of four types of sites on the characteristics of dynamic response were studied, especially the important peak response pamameters including shear force, sloshing height and rubber bearing displacement. The results show that the harder the sites are, the better reduced effect of tank has, but the effective range of isolation frequency can＇t necessarily broaden as the sites get harder. The better isolation effects are attained at the expenses of the increase of the bearing displacement. The sloshing height increases at different sites compared with that of non-isolated tank. The change of vibration frequency of sloshing height on site I is more intense than any other site, but the corresponding amplitude is minimal. The amplitude of increasing sloshing height on site IV is remarkable. The appropriate damping ratio of isolation bearings can reduce shear force, sloshing height and rubber bearing displacement. The isolation effect of 2000 m^3 tank on different sites is more effectively than that of 50000 m^3 tank except for on the site Ⅱ. The design parameters of isolated tank system should be optimized according to the aspect ratios of tank.

关 键 词：场地类型 隔震储罐 橡胶支座 地震响应 

分 类 号：P315.966[天文地球—地震学]