【作者】 王翠翠；

【导师】 张令心；

【作者基本信息】 中国地震局工程力学研究所 ， 防灾减灾工程及防护工程， 2009， 硕士

【摘要】 储液罐是石油、石化及相关企业存贮易燃、易爆、有毒介质的重要工业设施。一旦在地震中产生破坏,其灾害后果十分严重。自从20世纪30年代以来国内外学者针对立式储液罐进行了大量的研究,但主要是在线弹性方面的工作,并取得了一些有益于工程设计的研究成果。但是,对能够反映其地震作用下真实情况及揭示其破坏机理的非线性反应的研究却很少。本文给出了考虑液固耦合的立式圆筒形锚固储液罐非线性地震反应的分析方法,并研究了储液罐的非线性地震反应和破坏机理,为保证其地震安全,减少地震灾害具有重要意义。本文主要研究内容如下:1、系统地总结了储液罐的类型、储液罐在地震作用下的破坏形式。简要介绍了储液罐的经典理论,包括Housner刚性罐壁理论与Veletsos柔性罐壁理论,论述了国内外立式储罐抗震研究成果及需要进一步解决的问题。2、本文利用大型有限元分析软件ADINA实现考虑液固耦合储液罐系统非线性地震反应分析的研究。介绍了储液罐罐体和液体单元的选取、界面单元的定义、材料非线性本构关系、网格大小的划分、储液罐与液体之间的液固耦合作用等。3、采用上述方法研究了1000m3和10000m3两个不同尺寸的储液罐在五条不同场地条件地震波作用下的非线性地震反应,通过分析计算储液罐自振特性,储液罐的加速度峰值沿罐壁高度变化趋势,罐壁的应力和应变分布等反应,研究了储液罐的尺寸、液面高度、场地条件以及加速度峰值对储液罐地震反应的影响,初步揭示其破坏机理,分析结果为储液罐的抗震设计提供重要的参考依据。更多还原

【Abstract】 Liquid storage tanks are important industrial facilities for petroleum enterprises, petrochemical enterprises and other related enterprises to store the mediums with inflammable, explosive and toxic characteristics. Once destroyed under earthquake, the consequence of the disaster is very serious. Since the 1930s, extensive research has been conducted on cylindrical liquid storage tanks, however, these researches pays primary attention on the linear elastic behaviors and worldwide achievements are obtained, which could contribute to tanks engineering design. But the study on the real behavior of liquid storage tanks under earthquake and the nonlinear seismic response revealing the failure mechanism of tanks is very rare. In this paper, nonlinear seismic analysis method of cylinder type anchorage tanks considering the liquid-solid coupling is given. Furthermore, nonlinear seismic response of tanks and failure mechanism are studied. All these studies to guarantee the safety of liquid storage tanks and to reduce of earthquake disasters are of great importance.The main research and achievement are given as follows:1. The types of liquid storage tanks, failure modes of liquid storage tanks under earthquake are summarized systematically. The classical theory of storage tank which includes Housner theory for rigid liquid tank wall and Veletsos theory for flexible liquid tank wall is introduced briefly, the achievements in domestic and foreign on liquid storage tanks study and its developing trend is discussed.2. Using large finite element soft ADINA, nonlinear seismic response analysis of liquid-solid coupling tanks is realized. The liquid storage tanks wall elements and liquid elements are chosen, the interface elements are defined, the size of grid mesh requirement is discussed, the constitutive relationship of elastic-plastic material is determined, the liquid-solid coupling between liquid storage tank and liquid is implicated.3. The behaviors of non-linear seismic response of 1000m3 and 10000m3 liquid storage tanks under five different ground motions with different site conditions are researched. Through calculating the natural vibration characteristic of liquid storage tanks, change tendency of acceleration peak along tank wall, stress and strain distribution of tank wall, the influence on seismic response of liquid storage tanks from the size of liquid storage tanks, liquid height, site condition, acceleration peak are obtained. These results preliminarily reveal the failure mechanism and could provide the scientific references in engineering design.更多还原