Box culverts are typically analyzed as or "closed loops" using one of the following methods: StruBIM Box Culverts - User's manual - CYPE
The design must account for both permanent and variable actions that affect the top slab, side walls, and base. Permanent Actions ( Gkcap G sub k box culvert design calculations eurocode 2021
Design of concrete structures, covering strength and serviceability limits. Box culverts are typically analyzed as or "closed