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Contents • • • • • • • • • • • • • • • • • • • • • • • 751.8.1 General Concrete box culverts shall be classified as “Bridges” if the distance along the centerline of roadway from stream face to stream face of exterior walls is more than 20’-0”. Additional Info for the Districts The Bridge Division has prepared the for laying out and plan reporting details of concrete single box culverts (SBC) using the standard plans. The term “standard” is used throughout this article and refers to a culvert, or section of culvert, in which the design and details are completely covered by the.

All other culverts are considered nonstandard when either the design or details given in the Standard Plans are inadequate. Box culverts shall be analyzed and designed as rigid frames. All standard box culverts shall include bottom slabs. For box culverts built on solid rock, a nonstandard box culvert without a bottom slab should be considered.

Box culvert design

Where a box culvert is likely to settle, collar beams shall be provided at transverse joints to prevent large differential settlement between adjacent sections. For details, see. For culvert extensions, use the current design method as described herein regardless of what design method was used for the existing culvert.

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Match opening dimensions of new extension with those of the existing culvert when possible. Otherwise use larger opening dimensions. For cutting details of the existing culvert, see. All standard box culverts are designed assuming no degradation of the interior surfaces. In special cases where abrasion from sediment is a concern, a nonstandard culvert design may be considered.

751.8.1.1 Material Properties Concrete Unit weight of reinforced concrete, = 150 lb/ft 3 Continuous concrete slab, f ' c = 4.0 ksi Class B-1 n = 8 Modulus of elasticity, Where: f' c in ksi w c = unit weight of nonreinforced concrete = 0.145 kcf K 1 = correction factor for source of aggregate = 1.0 unless determined by physical testing Modulus of rupture, LRFD 5.4.2.6 Where: f’c is in ksi Steel Reinforcement For epoxy coated reinforcement requirements, see. When epoxy coated reinforcement is to be used, a nonstandard design is required. Minimum yield strength, f y = 60.0 ksi Steel modulus of elasticity E s = 29000 ksi Earth Fill Unit weight of earth fill, = 120 lb/ft 3 751.8.1.2 Standard Box Culverts Details of standard box culverts are available in. See for an index to the Box Culvert Standard Plans and a table showing the Standard Box Culvert Sizes. A typical box culvert is shown in Figure 751.8.1.2.1. In this figure, a cut section is defined as the section between two transverse joints. There are four types of standard box culverts shown in Figure 751.8.1.2.2.

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