The engineering task
A welded steel silo must be designed for filling, storage and discharge of bulk solid. Actions to EN 1991-4 depend on material properties, slenderness, filling method and flow pattern. Eccentric discharge creates asymmetric pressure and bending that may govern thin shells.
Structural verification covers more than the cylinder. Ring stiffeners, conical hopper, roof, transition and supports require compatible boundary forces. Eurocode 3 distinguishes plastic limits, buckling and fatigue; execution class and imperfections form part of the design basis.
Required design data
- Characteristic bulk-solid properties and ranges
- Cylinder, hopper, roof and support geometry
- Filling, discharge and eccentricity cases
- Steel grade, execution class, corrosion and imperfections
Technical solution approach
Generate bulk-solid actions
Determine symmetric and asymmetric filling and discharge pressure over height and circumference to EN 1991-4.
Verify the cylindrical shell
Assess meridional, circumferential and shear stress including buckling and imperfections to EN 1993-1-6.
Size ring stiffeners
Derive required ring stiffness and resistance from shell actions and support conditions.
Calculate hopper and roof
Verify cone, transition ring and circular roof for their membrane and stability states.
Combine the full system
Combine stored material, self-weight, wind, snow and earthquake into governing Eurocode combinations.
Expected deliverables
Suitable SOL ALPHA modules
The modules form a technically plausible toolchain. Their final selection and sequence will be confirmed during the later calculation against the applicable code and project conditions.