STRUCTURAL BEHAVIOR OF A REINFORCED CONCRETE ARCH CULVERT. PHASE 3. CEDAR CREEK. SECTION I: INTRODUCTION AND PROJECT DESCRIPTION WITH CONCLUSIONS AND RECOMMENDATIONS FOR IMPLEMENTATION
A 22-ft (6.7 m) arch culvert, embedded in a highway embankment under 191 ft (58 m) of overfill, was heavily instrumental to evaluate relative behavior of standard and rigid structural sections subjected to two backfill parameters: (1) Method B backfill (baled straw surrounding barrel); and (2) Method A backfill (no soft inclusion). Section I traces the history of California's arch culvert research, describes the prototype and instrumentation thereof, and discusses third phase objectives, conclusions and recommendations for implementation, viz.: (1) Soil stress-overfill functions were approximately linear; (2) Soil stress profiles at the extrados differed greatly and unconservatively from assumed design distributions; (3) Soil stresses increased after attainment of maximum overfills over sideslope sections but not after embankment completion; (4) Foundation stresses verified vertical, static equilibrium; (5) Embankment soil stresses paralleled neighboring, interface, extrados stresses, but many were sub-hydrostatic; (6) Vertical footing settlements approached 3 ins. (7.5 cm), but differential settlements were small; (7) Characteristic footing rotations occurred, significantly influencing structural behavioral; (8) Expensive, timber cross-bracing proved to be of questionable value; (9) Neutral point analyses correctly assessed barrel moments, displacements and stresses, but axial thrusts appeared to be greatly influenced by thermal stresses; (10) Settlement ratio analyses indicated a 'ditch condition' for Method A backfill with bounds inside the arch barrel; (11) Finite element analyses produced encouraging results for the section with Method B backfill. Distress appeared earlier and was ultimately greater for arch sections under the straw; however, the construction method produces a very predictable soil stress distribution. Based on past experience, the report does not advocate it; however, precautions are offered for potential users.
- See also PB-180 263, and PB-285 101. Also available in set of 11 reports PC E99, PB-285 099-SET.
California Department of Motor VehiclesP.O. Box 11828, 2415 1st Avenue
Sacramento, CA United States 95813
Washington, DC United States 20590
- Davis, R E
- Nix, H D
- Bacher, A E
- Publication Date: 1977-6
- Pagination: 94 p.
- TRT Terms: Backfilling; Culverts; Earth pressure; Embankments; Field tests; Finite element method; Footings; Highways; Reinforced concrete; Soil mechanics
- Geographic Terms: California
- Old TRIS Terms: Backfills
- Subject Areas: Bridges and other structures; Geotechnology; Highways;
- Accession Number: 00182040
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: 624120-SECT-1, FHWA/CA/ST-4120-77-01
- Files: NTIS, USDOT, STATEDOT
- Created Date: Dec 3 2002 12:00AM