Reinforced Concrete Box Culvert Design Example

Concrete box culvert dimensions.

Reinforced concrete box culvert design example.

Precast concrete box sections resource cp 02 704 cast in place reinforced concrete box culverts have been designed and used for many years because of special waterway requirements unusual load conditions or designer preference. The example is presented to promote comment and discussion. They may be either single or multi cell. Reinforced concrete box culverts and similar structures 19 3 12 16 05 19 2 19 2 selection criteria the most appropriate type of short span structure must be determined by the designer.

Box culvert design for stormwater conveyance project data. Design the in situ concrete culvert shown below to carry ha and 45 units of hb loading. Figure 12 2 1 1 typical precast concrete box culvert dimensions each culvert size has three or four classes. Design new reinforced concrete culverts and extensions to existing culverts are subjected to either earth fill and or highway vehicle loading in accordance with the aashto lrfd bridge design specifications.

Each class has specified wall and slab thicknesses reinforcement areas concrete strength and fill 12 2 box culverts 1 2. 3 g e n e a l 12 2 1 precast concrete box culverts. The most common usage is to carry water under roadways but they are frequently used for pedestrian. Concrete culvert design and detailing manual 2003 03 14 introduction page 1 1 introduction 1 1 general the concrete culvert design and detailing manual have been prepared to facilitate the design and detailing of standard rectangular concrete culverts.

The applicable section is 12 11 reinforced concrete cast in place and precast box culverts and reinforced cast in place arches this section is only six pages long and will lay out the specifics for concrete box culverts but the bulk of the calculations are based on section 5 concrete structures. Precast concrete box culvert will be used in this design. 1 2 divisions this manual is divided up into the following divisions. A design span for a concrete box culvert in excess of 7 5 m may prove to be uneconomical.

Flow rate q 1000 ft3 sec length l 800 feet initial slope so 0 5 allowable head water hw 15 feet manning s n 0 012 design example.