罐顶对罐壁应力的影响

Impact of Tank Roof on Shell Stress

在大型油罐设计中采用线性理论的方法,分析论述了罐顶对罐壁是否产生影响这一问题。通过对拱顶油罐、浮顶油罐的罐壁边界条件、罐顶边界条件的分析计算,求出各层壁板挠度方程中的待定系数,便可得出其应力。从线性方程中,可看出影响罐壁应力的主要因素是挠度方程中的待定系数。待定系数除受储罐尺寸、液位高度的影响外,还受罐顶重量、罐顶剪力和弯矩的影响。以10万m^3浮顶油罐和拱顶油罐为例,进一步证明,液位是罐壁应力的控制因素,而罐顶重量、罐顶剪力和弯矩对罐壁应力的影响可以忽略不计。

The paper, using linear theory, analyses whether tank roof has any impact on shell stress. The shell stress for each layer can be derived from the undetermined coefficient in its flexibility equation obtainable by analysing and calculating the shell boundary conditions and roof boundary conditions for arc/floating roof tanks. It can be seen from the linear equation that the main factor impacting shell stress is the undetermined coefficient in the flexiblity equation, and that this coefficient is dependent on the weight, shear force and bending moment of the tank roof, as well as on the tank size and liquid level. With 100,000 m3 floating roof and arc roof tanks as examples, the autor proves that liquid level places a dominant role on the impact on shell stress, while the impacts of roof weight, shear force and bending moment on shell stress are ignorable.