Obliczenia wytrzymałościowe


Silo loads


   In this article we spend some time on silo loads considering. Generally calculations according to standards are quite complicated. In order to understand the idea of determining silo loads we focus on simple linear equations. In case of squat silos linear equation often gives satisfactory approximation. The problem is in slender silos where linear equations cause overestimation of the loads acting on silo walls. Linear distribution is presented below for squat silo and nonlinear distribution for slender silo.

 Silo load

             Squat silo                             Slender silo


Horizontal pressure acting on vertical walls at "y" level is equal: 


py = px · tg2 (45-φ/2)

where: px - vertical pressure in stored particulate solid at "y" level, so it is equal:                 


px = γ · y

gdzie: γ - unit weight

          φ - angle of repose


Pressure normal to hopper wall is calculated as below:

pa = px · cos2α + py · sin2α



to be continued.