Recommended Design Specifications for Live Load Distribution to Buried Structures (2010) / Chapter Skim
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Pages 6-8
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For design, the AASHTO Standard and LRFD Specifications have two major differences relative to the treatment of live loads spreading through fills: • The Standard Specifications apply live loads as a point load at the surface, increasing with depth to a square with sides equal to 1.75 times the depth of cover. The LRFD specifications apply live load through a tire footprint of 10 in.
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From page 7... ...
Nine culvert structures were modeled: • Concrete arch, • Concrete pipe, • Concrete box, • Corrugated metal pipe (CMP) , • Corrugated metal arch (CMA)
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From page 8... ...
Then, proposed SDEs were developed based on the culvert structure forces predicted by the structural analyses. Box section forces were evaluated first, because box sections have flat top slabs which afford an opportunity to evaluate not only the design forces but the vertical soil stresses on the top slab.
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