Traffic loads (e.g., IRC Class AA, 70R, or HL-93) transferred through soil, reduced with depth based on dispersion. Earth Pressure: Horizontal earth pressure ( Pecap P sub e ) on sidewalls ( Water Pressure: Internal and external hydrostatic pressure. Step B: Structural Analysis
ptop=k0⋅γs⋅Htopp sub top end-sub equals k sub 0 center dot gamma sub s center dot cap H sub top end-sub
Transition your mathematical inputs into a verified plane-frame model or use open-source structural toolkits.
Does the PDF use appropriate load factors? For LRFD, look for: box culvert design calculations pdf fix
: Vehicular traffic (e.g., IRC Class A or AASHTO HL-93) dispersed through the earth fill and slab.
[ ] Design Code: Verified against AASHTO LRFD / ASTM C1577 / Local DOT Manuals [ ] Live Load: HL-93 truck loading and lane loading applied correctly [ ] Earth Cover: Minimum (0 ft) and maximum fill cases evaluated independently [ ] Concrete Strength: f'c matches specified mix design (typically 4,000 - 5,000 psi) [ ] Steel Strength: fy set to 60,000 psi (Grade 60) [ ] Buoyancy: Flotation safety factor checked for high-water table scenarios [ ] Deflection: Service load deflections within span/800 limits ✅ Corrected Design Summary
Ensure the design uses a minimum wet density of if the backfill is highly compacted clay. Traffic loads (e
When earth cover is less than 2.0 feet, do not use soil interaction distribution formulas. Instead, apply the direct AASHTO HL-93 truck wheel loads directly to the top slab as a concentrated patch load, accounting for dynamic load allowance (impact factor, For depth ( ≥is greater than or equal to
: Determine the internal width (span) and height (rise) based on hydraulic requirements.
: Weight of the earth cushion (fill) and road crust above the top slab. Does the PDF use appropriate load factors
Is it adjusted for corrosive environments (min. 2–3 inches)?
), or introduce a corner haunch to amplify shear resistance at the supports. How to Re-Export a Verified, Clean PDF Report