LNG储罐隔振体系地震响应分析

发布时间：2018-10-24 09:41

【摘要】：2013年我国的雾霾天气频发,地方政府相继出台空气质量措施,煤改气和油改气进程加快,带动全国天然气需求增加,天然气进口量持续增长,促进了天然气存储设施的建设。由于LNG储罐自身价值高,加之储罐本身是重要的军事和民用设施,地震作用下一旦发生破坏,会造成严重的经济损失和人员伤亡,所以对LNG储罐进行隔震研究,不但能够减小地震对LNG储罐的破坏,还能节约建设成本,同时具有实际工程意义。本文研究的主要内容如下。1.简要介绍夹层橡胶的基本构造和力学性能。总结LNG储罐进模态分析方法和隔震动力分析基本理论,奠定论文的理论基础。2.以实际工程为背景,应用ADINA有限元软件,建立LNG储罐三维有限元模型,着重对LNG储罐进行模态分析,得出预应力钢筋的分布与张拉不会影响LNG储罐外罐的模态,并且Qg罐对外罐的频率影响较小,外罐对Qg罐液固耦合频率影响较大。采用隔震装置后LNG储罐频率减小。3.本文选取S_1=30,S_2分别为5和5.5,其他参数相同的两种铅芯橡胶,对比分析得出,隔震体系能有效减小LNG储罐地震响应,但2S的改变对减震率的影响不显著。改变铅芯橡胶支座的参数,隔震频率控制在ω=2~5rad/s,阻尼比在ξ=0.2~0.5范围时,能有效改变LNG储罐减震率。采用隔震支座后不但有效减小LNG储罐地震反应,同时也节约造价成本,减少的造价约占总造价的1.8%。
[Abstract]:The frequent weather of haze in China in 2013 resulted in the introduction of air quality measures by local governments and the acceleration of the process of changing coal into gas and oil into gas, which led to the increase of natural gas demand and the continuous increase of natural gas imports, which promoted the construction of natural gas storage facilities. Because of the high value of LNG storage tank and the fact that the storage tank itself is an important military and civilian facility, once the damage occurs under earthquake, it will cause serious economic losses and casualties, so the isolation study of LNG storage tank is carried out. It can not only reduce the damage of LNG storage tank caused by earthquake, but also save the construction cost. The main contents of this paper are as follows. 1. The basic structure and mechanical properties of laminated rubber are briefly introduced. This paper summarizes the method of modal analysis and the basic theory of seismic isolation dynamic analysis of LNG storage tank, and establishes the theoretical foundation of the paper. 2. Under the background of practical engineering, the three-dimensional finite element model of LNG storage tank is established by using ADINA finite element software, and the modal analysis of LNG tank is emphasized. It is concluded that the distribution of prestressed steel bar and tensioning will not affect the modal of external LNG tank. The external Qg tank has little effect on the frequency of the external tank, and the external tank has a great effect on the liquid-solid coupling frequency of the Qg tank. The frequency of LNG tank is decreased by using isolation device. 3. 3. In this paper, two kinds of lead-core rubbers with the same other parameters are selected, which are respectively 5 and 5.5 for S1D 30 / S, respectively. The comparison and analysis show that the isolation system can effectively reduce the seismic response of the LNG storage tank, but the effect of the change of 2S on the seismic absorption rate is not significant. When the parameters of lead rubber bearing are changed, the vibration isolation frequency is controlled at 蠅 = 2 ~ 5 radr / s, and the damping ratio is in the range of 尉 = 0.2 ~ 0. 5, the damping rate of LNG storage tank can be changed effectively. The seismic response of LNG storage tank is effectively reduced by using the isolation support, and the cost is also saved. The reduced cost is about 1.8% of the total cost.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU352.12

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