Box Culvert Design Excel Sheet May 2026

Introduction

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Then use Excel’s Camera Tool to paste this summary into a printable "Design Certificate." Compare Vu with VRd,c and compute stirrup spacing if needed

  • Compare Vu with VRd,c and compute stirrup spacing if needed.
  • n = Manning’s roughness coefficient (0.012–0.015 for concrete).
  • S = Slope of culvert (m/m).

FEM=W×Le212cap F cap E cap M equals the fraction with numerator cap W cross cap L sub e squared and denominator 12 end-fraction Moment Distribution n = Manning’s roughness coefficient (0

Step 1: Input Section

  • Culvert dimensions (B, D, L, fill height)
  • Concrete grade (f'c) and steel grade (fy)
  • Cover, bar diameter, spacing
  • Vehicle load type (HS-20, HL-93)

Step 5: Reinforcement Design Module

  • Compute required As for flexure (top/bottom, inside/outside).
  • Check minimum and maximum steel ratios.
  • Check shear capacity – add shear reinforcement if needed.