...
A complete start-to-finish design using Eriksson Culvert will be demonstrated in this chapter. The job is a typical precast four sided box culvert, which will be designed in accordance with the LRFD 6th Edition Specifications. Below are the input values for the problem.
Governing Specification | AASHTO LRFD 6th Edition |
Culvert Dimensions | Clear Span = 16 ft Clear Height = 8 ft Length = 8 ft Fill Depth = 1.99 ft Skew = 0 deg Top Haunch = 8 in Bottom Haunch = 8 in |
Reinforcement Covers | Top Slab Cover = 2 in Bot. Slab Cover = 1 in Ext. Walls Cover = 1 in |
Concrete | f’c = 5.0 ksi f’ci = 4.5 ksi Wc = 0.150 kcf |
Steel | fy = 60 ksi |
Soil | Density = 0.12 kcf Max. Equivalent Fluid Pressure = 60 pcf Min. Equivalent Fluid Pressure = 30 pcf |
Live Load | HL-93 |
...
Data Preparation
Most input fields in Eriksson Culvert’s interface were designed to minimize the preliminary work that must be done by the engineer prior to running the program.
...
The serviceability check is next, followed by the output at the critical sections.
...
The critical section tables are split into two separate tables, flexure and shear.
The flexure critical table lists important values for the designer, along with the ratings and what controls at that section (flexure, cracking, minimum steel, or fatigue). Note that not all design codes require a fatigue check.
The shear critical table also lists the important values in the shear design for the engineer, along with the shear ratings and what equation or procedure Vc (iterative beta, constant beta, box culvert equation, or Standard/AREMA).
The last part of the printout shows the load combination results at the tenth points.
...