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Spreadsheets must be tailored to specific regional standards since design equations vary globally: Bridge Design Specifications (United States).
Offers standard designs and calculation tools for concrete box culverts. box culvert design calculations xls link
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Cell zones for geometric dimensions (clear span, clear height, slab thicknesses), material properties (concrete grade fc′f sub c prime , steel yield strength ), and soil properties (density, internal friction angle). Hardcoded matrix formulas calculate fixed-end moments
Hardcoded matrix formulas calculate fixed-end moments, distribution factors, and final bending moments instantly.
: Solves for bending moments, shear forces, and axial forces using the Hardy Cross or stiffness method. the corners are assumed rigid.
For a standard box culvert without bottom slab (footing) or with a slab, the corners are assumed rigid. The moment at the corner ($M_c$) is often approximated for preliminary design as: $$M_c \approx \fracw L^212$$ (Note: Exact analysis requires matrix methods or coefficients depending on wall/slab stiffness ratios.)
Lateral earth pressure caused by vehicles moving adjacent to the culvert walls.