基础不均匀沉降下球罐地震反应分析

发布时间：2018-01-23 01:46

  本文关键词： 球形储罐 流固耦合 地震反应 基础不均匀沉降 有限元　出处：《东北石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：球形储罐与其他压力容器相比有很多优点,如占地面积小、受力情况好、承压能力高,现场安装,运输方便。在其进行正常的工作运行一段时间后,经常会出现基础不均匀沉降等质量问题,而且大部分球形储罐在出现这类问题时,常常伴有球形储罐的支柱出现倾斜,还会在支柱上产生一个附加的应力,若附加应力值较大,则可能使支柱超过其最大的容许应力,有可能会产生球形储罐结构失稳,从而使球罐产生破坏。因此研究球形储罐的基础不均匀沉降,具有实际的工程意义与工程价值。本文以1000m~3储罐为例,通过使用SPH方法与等效质量法建立有限元模型,讨论了流固耦合作用对地震反应的影响,对基础不均沉降下的球罐模型分别在液压试验工况与地震工况进行了模拟分析,具体的内容如下:1.介绍了光滑粒子流体动力学方法(SPH),阐述了SPH方法的基本原理以及拉格朗日型的Navier-Stokes方程的SPH方法表示。2.通过使用SPH方法建立Antoci等人设计的试件有限元模型,并将数值分析结果与实验进行对比,证明SPH方法的可靠性与合理性。3.使用SPH方法建立了考虑流固耦合作用下的球形储罐的有限元模型,并用加速度时程分析方法进行地震反应分析,结果表明考虑流固耦合作用下球形储罐模型的顶点位移、柱底部剪力、柱底支反力和拉杆应力与以等效质量法建立的球形储罐模型的计算结果在数值上要小许多,同时随着时间衰减的也更加剧烈,证明了流固耦合作用对球形储罐的地震反应有明显的影响。4.分别建立考虑单根支柱下沉、整体向一个方向倾斜、中间下沉以及两侧下沉这个四种基础沉降方式下,储液量为89%的1000m~3球形储罐有限元模型,分析支柱处在水压试验状态下应力分布情况。5.采用SPH方法分别建立容积为400m~3、650m~3、1000m~3球罐的流固耦合有限元模型,分析球罐容积对其基础不均匀沉降的影响。6.通过SPH方法与等效质量法分别建立了容积为1000m~3储液89%的球形储罐有限元模型,对球罐支柱在四种基础不均匀沉降情况下进行安全性分析,并且分析了不同地震波对球罐基础不均匀沉降的影响。
[Abstract]:The spherical tank has many advantages compared with other pressure vessels, such as small footprint, good stress condition, high bearing capacity, on-site installation, convenient transportation. Work in normal operation for a period of time in the post, often appear uneven settlement of the foundation of quality problems, and most of the spherical tank in such problems when often, with pillar of the spherical tank tilt, will produce an additional stress in the pillars, if additional stress is large, it may make the pillar exceeds its maximum allowable stress, may produce spherical tank structure instability, so that the tank damage. Therefore the research foundation of the spherical tank the uneven settlement, engineering and engineering has practical value. This paper takes 1000m~3 tank as an example, by using the SPH method to establish the finite element model and equivalent mass method, discussed the fluid solid coupling effect on seismic response Influence of spherical tank model of foundation uneven settlement under respectively in the hydraulic test conditions and seismic conditions were simulated and analyzed, the specific contents are as follows: 1. introduces the smoothed particle hydrodynamics (SPH) method, elaborated the SPH Navier-Stokes equation SPH method and the principle of the Lagrange type representation of.2. Antoci et al design test a finite element model is established by using the SPH method, and the results of the numerical analysis and experimental comparison show that finite element flow of spherical tank and solid coupling model of considering reliability of the SPH method and the rationality of.3. using the SPH method, and the acceleration time history analysis method for seismic response analysis, the results indicate that the consideration of the top displacement the spherical tank model of fluid solid coupling, column bottom shear model, spherical tank column bottom counterforce and bar stress and to establish the equivalent mass method The numerical results in the smaller many, at the same time with the time decay is more intense, proved that the seismic response of FSI on spherical tanks with single pillar were established considering sinking effect of.4. is obvious, the overall tilt in one direction, the middle of sinking and the two side sinking in this four kinds of foundation settlement mode. The reservoir volume model for 1000m~3 spherical tank 89% finite element analysis, the stress distribution in the pillar of.5. were established by the method of SPH 400m~3650m~31000m~3 spherical tank volume pressure test under the condition of fluid solid coupling finite element model are established for finite element model of spherical tank volume 89% 1000m~3 liquid storage tank volume on the basis of the analysis of not the settlement effect of.6. by the SPH method and the equivalent mass method of spherical tanks in four kinds of uneven settlement of foundation, the safety analysis and case analysis The influence of different seismic waves on the uneven settlement of the spherical tank foundation.

【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU433
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本文编号：1456339