基底隔震储罐频率特征与减震机理分析研究  

The study on frequency characteristics and isolation mechanism of isolated liquid storage tanks

作　　者：李扬[1] 李自力[1] 毕静[1] 

机构地区：[1]中国石油大学(华东)储运与建筑工程学院,山东东营257061

出　　处：《世界地震工程》2009年第4期153-160,共8页World Earthquake Engineering

摘　　要：研究不同高径比橡胶基底隔震储罐的频率特征,探讨储罐隔震体系3种不同振动频率随支座隔震频率变化规律。分析在不同频谱特性地震波激励下,隔震体系各振型组分对地震响应(基底剪力、支座位移和晃动波高)的影响,以及响应峰值随支座隔震频率和阻尼比的变化特点。研究表明,基底剪力峰值与场地地震波频谱特性密切相关。支座隔震频率不能完全反映减震机理的实质,隔震振型频率是影响基底剪力的重要参数。在软弱场地上隔震储罐的减震效率低,有效隔震频率范围窄。晃动波高峰值是储罐自振特性和地震波频谱特性等多种因素导致的结果,隔震系统设计时需特别考虑晃动波高增大的影响。In this paper, the vibration characteristics of two types of isolated tanks and the relation between three natural frequencies of the isolated tank and bearing isolation frequency are investigated. Moreover, the seismic response and the contributions to seismic response by different vibration modes of the isolated tank are discussed under earthquake ground motions with different frequency spectrum characteristics, especially the relation between peak seismic response and the isolation frequency, damping of the isolation bearing. The results show that the peak of base shear is associated with the frequency .spectrum characteristics of earthquake ground motions. The isolation frequency of bearing can not represent the nature of the base isolation, but the frequency of isolation mode is a primary parameter for determining the base shear. The base isolation is less effective for the isolated tank on soft site and the effective range of the isolation frequency is narrower. The frequency characteristics of the tank and the frequency spectrum characteristics of earthquake waves result in the peak of sloshing height. Furthermore, the influence of the sloshing height on the design of the isolated tanks need to be considered in detail.

关 键 词：隔震储罐 橡胶支座 频率特征 地震响应 

分 类 号：TU352.1[建筑科学—结构工程] P315.966[天文地球—地震学]