Effect of stiffeners on structural behavior of steel liquids tank

The finite element method is used to conduct the analysis of liquid storage tanks. This research has focused on the structural behaviors, under static condition, free vibration and buckling of steel liquid tanks which are designed according to American Petroleum Institute (API) 650 standards. The materials properties and the real geometrical and load measures have been considered in the numerical model. These storage tanks are stiffened with standard steel profiles. The equivalent stress (Von-Mises) distribution, deformation in circular wall of liquid tank, buckling load and fundamental frequency are computed using finite element method in order to investigate the effect of type of the stiffener, number of course and location of stiffener on structural behavior of liquid tanks. The uses of the stiffeners decrease the stress and increase the fundamental frequency and buckling multiplier factor of wall tank and improve the other structural behaviors.