Note: Always download from reputable engineering portals. Scan for macros before enabling.
Several authoritative engineering communities offer free or premium Excel sheets for reinforced concrete box culvert design: Box Culvert Design Spreadsheet box culvert design calculations xls link
to analyze the culvert as a rigid frame. They evaluate three primary load cases: Note: Always download from reputable engineering portals
: Hosts various detailed templates, such as this AASHTO LRFD Box Culvert Design Sheet and a Single Cell Box Culvert Structural Design file. box culvert design calculations xls link