Development of a simplified method for hydrodynamic pressures in wall corners and roof in liquid storage tanks

液体储罐壁角和顶部水动压力简化方法的开发

• 批准号: 520333-2017
• 负责人: Mohammadian, Abdolmajid
• 金额: $ 1.82万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=639830
• 关键词: Development; simplified; method; hydrodynamic; pressures

Liquid Storage Tanks (LST's) are used for storage of drinking water, various industrial liquids such asLiquified Natural Gas (LNG), oil, petroleum, as well as in the treatment of pulp and paper product wastes aswell as other industrial wastes. The stored materials could also be toxic or flammable, so keeping the tanksfunctional and preventing them from damages during and after an earthquake event is important in the designprocess. Currently, simplified analytical methods are adopted by design codes in North America for the designof these tanks. However such methods are only acceptable in tanks with certain aspect ratios where sloshingwaves are linear. For tanks in which non-linearity occurs, the method loses its accuracy. In a design case,reliable prediction of the forces on the roof and required freeboard is important to prevent failure of the tanks.Some previous studies show that the hydrodynamic pressure due to the sloshing of the liquid at the sharp tankcorners can be up to three times higher compared to other locations. This pressure can cause significant damageto the tanks. In the current project, partially filled tanks with and without a roof are excited on a seismicshaking table. For tanks with a roof, the data is obtained through pressure sensors that are placed at variouslocations on the tank and collecting the pressure data to find the associated pressures at each senor location. Forroofless tanks, the sloshing height is the parameter of interest. The simulations are also recorded in the form ofvideo clips for further investigation of the free surface. For the simulations, the OpenFOAM which is aComputational Fluid Dynamics (CFD) program is used to generate excitations. The results of numerical andexperimental study are used to develop a simplified procedure to calculate the sloshing heights and roofpressures near the tank corners.

液体储罐 (LST) 用于储存饮用水、各种工业液体，例如液化天然气 (LNG)、油、石油，以及纸浆和纸制品废物以及其他工业废物的处理。存储的材料也可能有毒或易燃，因此在设计过程中保持储罐的功能并防止它们在地震期间和地震后损坏非常重要。目前，北美的设计规范采用简化的分析方法来设计这些储罐。然而，这种方法仅适用于具有一定纵横比且晃动波呈线性的储罐。对于出现非线性的储罐，该方法会失去准确性。在设计案例中，可靠地预测顶部的力和所需的干舷对于防止储罐发生故障非常重要。之前的一些研究表明，由于液体在储罐锐角处晃动而产生的流体动压可能高达三倍与其他地点相比更高。这种压力会对储罐造成严重损坏。在当前的项目中，部分填充的带顶和不带顶的储罐在地震振动台上受到激励。对于有顶部的储罐，数据是通过放置在储罐上不同位置的压力传感器获得的，并收集压力数据以找到每个传感器位置的相关压力。对于无顶储罐，晃动高度是感兴趣的参数。模拟还以视频剪辑的形式记录，以便进一步研究自由表面。对于模拟，使用计算流体动力学 (CFD) 程序 OpenFOAM 来生成激励。数值和实验研究的结果用于开发一个简化的程序来计算罐角附近的晃动高度和顶部压力。