In the realm of hydraulic and transportation infrastructure, the box culvert is an unsung hero. Whether channeling a stream under a busy motorway, providing a livestock underpass, or serving as a utility tunnel, the cast-in-place or precast concrete box culvert is ubiquitous. However, designing one is far from routine. Since the full rollout of the Eurocode suite (particularly EN 1990, EN 1991, and EN 1992) and its National Annexes, the approach to has evolved significantly.
This paper presents a step-by-step calculation procedure for the structural design of precast or cast-in-situ reinforced concrete box culverts following Eurocode standards. It covers geotechnical loads (earth pressure), traffic loads (LM1), water pressure, self-weight, load combinations (STR/GEO limit states), bending moment and shear force envelope derivation, and reinforcement design per EN 1992-1-1. A worked example for a 3m × 2m single-cell culvert with 1.5m cover is included. box culvert design calculations eurocode 2021
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