LNG储罐预应力混凝土外罐的地震动力响应分析

发布时间：2018-09-05 11:13

【摘要】：2013年,中国天然气进口量持续增加,很多天然气储罐建成和投产,大大提高了我国天然气的存储量。LNG储罐自身具有很高的经济价值,而且存储了危险的天然气,一旦发生地震,并在地震作用下储罐发生破坏,不仅会导致大量的财产损失,而且还会造成严重的次生灾害。所以在地震多发地区,研究LNG储罐的抗震性能,不仅可以减小LNG储罐的地震灾害,同时还为LNG储罐抗震的设计提供理论参考,具有实际工程意义。因此本文的主要研究内容如下。1.简要介绍有限元的基本理论和ADINA有限元软件。总结在地震动力响应分析时,LNG储罐的模态分析方法和地震动力响应方程与计算方法,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LNG储罐Qg罐和外罐极易产生多波环向效应和重根现象,外罐频率受Qg罐影响较小,但外罐对Qg罐液固耦合频率影响较大,对液体晃动频率影响较小。3.考虑在不同场地条件下,针对LNG储罐空罐,即单独混凝土外罐;半罐,即Qg罐泄漏,液体高度为Qg罐液体的二分之一;满罐,即Qg罐液体完全泄漏,三种工况,分析地震作用下LNG储罐预应力混凝土外罐的地震动力响应,得出罐壁底部、罐壁高度1/4和3/4附近,应力相对比较大,应该在设计和施工时应注意其安全性。并且当LNG储罐建在坚硬的场地条件下,需要采取一定的抗震和减震措施,减小LNG储罐的地震动力响应。
[Abstract]:In 2013, China's natural gas imports continued to increase, and many natural gas storage tanks were built and put into production, which greatly increased the natural gas storage capacity in China. LNG storage tanks themselves had high economic value and stored dangerous natural gas. Once an earthquake occurred, The damage of storage tank caused by earthquake will not only cause a lot of property losses, but also cause serious secondary disasters. Therefore, in the earthquake-prone areas, the study of the seismic performance of LNG tanks can not only reduce the earthquake disaster of LNG tanks, but also provide a theoretical reference for the seismic design of LNG storage tanks, which has practical engineering significance. Therefore, the main contents of this study are as follows. 1. The basic theory of finite element and ADINA finite element software are briefly introduced. This paper summarizes the modal analysis method, seismic dynamic response equation and calculation method of LNG storage tank in seismic dynamic response analysis, and lays the theoretical foundation of the paper. 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 Qg tank and outer tank of LNG tank are prone to produce multi-wave circumferential effect and heavy root phenomenon. The external tank frequency is less affected by the Qg tank, but the external tank has a greater influence on the liquid-solid coupling frequency of the Qg tank, and has little effect on the liquid sloshing frequency. Under different site conditions, considering the empty LNG tank, that is, the single concrete outer tank; the half tank, that is, the Qg tank leakage, the liquid height is 1/2 of the Qg tank liquid; the full tank, that is, the Qg tank liquid completely leaking, three working conditions, The seismic dynamic response of prestressed concrete outer tank of LNG storage tank under earthquake action is analyzed. It is concluded that the stress is relatively large at the bottom of the tank wall and near 1 / 4 and 3 / 4 of the height of the tank wall, so the safety should be paid attention to in the design and construction. And when the LNG storage tank is built under the condition of hard site, it is necessary to take some seismic and seismic absorption measures to reduce the seismic dynamic response of the LNG tank.
【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】：TU378;TU311.3

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