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Recommended Design Specifications for Live Load Distribution to Buried Structures (2010) / Chapter Skim
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Summary
Pages 1-5

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 1...
... Numerical modeling conducted to evaluate model characteristics, software, and soil constitutive models indicated that a linearly elastic, perfectly plastic model with a MohrCoulomb failure criterion provided the best mix of capturing (1) the important aspects of soil behavior in transmitting live loads to structures and (2)
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From page 2...
... A spreading constant of 1.75 does not adequately represent the modeling results; a spreading constant of 1.15 is slightly unconservative at shallow depths, is adequate for 24-in culverts at most depths, and conservative for larger culverts. Regarding bending moments in the structures, the crown bending moment has the greatest absolute magnitude in response to live loads.
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From page 3...
... Table 3-1 in Chapter 3 summarizes the changes to each section for the six culvert types. In order to understand the effect of the proposed SDEs on culvert designs, the critical structural responses were calculated and compared (for Standard, LRFD and proposed design equations)
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From page 4...
... 2D response ratios for concrete boxes, concrete arches, and corrugated metal arches were too variable to be captured adequately by these guidelines. The 3D guidelines address software, live load application, representing the pavement, representing the soil, model dimensions, element size, symmetry and boundary conditions, representing culvert structures, and the soil-culvert interface.
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From page 5...
... Based on this research, the current AASHTO load spreading method provides a neutral or conservative approach for all culvert types, except corrugated metal arches. The proposed SDEs are a better fit to the modeling results produced in this study and are generally less conservative than the current AASHTO load-spreading method.
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Key Terms

  • proposed sdes
  • live loads
  • corrugated metal
  • design force
  • concrete pipe

  • lrfd design
  • design specifications
  • culvert types
  • surface live
  • design forces

  • design equations
  • concrete box
  • reinforced concrete
  • concrete boxes
  • load distribution

  • modeling results
  • bending stiffness
  • average design
  • simplified design
  • concrete arch

  • proposed sde
  • culvert designs
  • six culvert
  • metal pipe
  • culvert structures

  • numerical modeling
  • buried culverts
  • aashto standard
  • box culverts
  • current aashto


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