The analysis of service ability of polyethylene pipes and tanks with the hollow wall by strength criterion
Methods of the estimation of the stress-strain state of tubular elements with cellular wall structure are suggested. As a result, a system of differential equations for the search of the forces and moments which arise in the cell wall is written. Key equations for the estimation of the stress components are established. Recommendations on the calculation and designing of a cellular long tube and a vertical cell reservoir, located in soil, are presented.