![]() Maximum height of water inside the culvert is 1.8m above the invert level of the culvert.īackfill material will be Class 6N with a density (γ) = 19kN/m 3.įill over the culvert consists of 0.5m of Class 6N overlaid with 0.3m of road sub-base with a density (γ) = 20kN/m 3 and 0.2m of carriageway construction with a density (γ) = 24kN/m 3Ĭonsider loading on 1m strip of the culvert.Īssume a wall thickness of 300mm and concrete density (γ) = 25kN/m 3 Maximum height of ground water is 1m above the invert level of the culvert. The ground investigation report shows the founding strata to be a cohesionless soil having an angle of shearing resistance (φ) = 32° and a safe bearing capacity of 300kN/m 2 and classified as 'not hard' material. The bridge site is located south east of Oxford (to establish the range of shade air temperatures). Analyse the culvert using a unit strip method. The example is presented to promote comment and discussion.ĭesign the in-situ concrete culvert shown below to carry HA and 45 units of HB loading. ![]() Buried Box Design Example to BD 31 The following example is not a definitive solution for the design of a box culvert, but provides one solution to demonstrate the principles involved when considering design standards BD 31 and BS 5400.
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