Field study of integral backwall with elastic inclusion.

Details

• Creators:
  Hoppe, Edward J
• Corporate Creators:
  Virginia Transportation Research Council (VTRC) ; Virginia. Dept. of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  Backfilling Bridge Approaches--Design And Construction--Virginia Bridges--Abutments--Virginia Fills (Earthwork)--Virginia Geosynthetics Polystyrene
• Publication/ Report Number:
  FHWA/VTRC 05-R28
• Resource Type:
  Tech Report
• Geographical Coverage:
  Virginia
• Edition:
  Final report;August 1999January 2005.
• Corporate Publisher:
  Virginia Transportation Research Council (VTRC)
• Abstract:
  Jointless construction is considered an effective design option to reduce bridge maintenance costs and resist seismic loads. Although these attributes make the integral bridge an increasingly popular choice, soil-structure interaction issues unique to this type of design remain unresolved. Of particular concern is the excessive settlement of approach embankments, resulting from the repetitive, thermally induced cyclic movements of the superstructure. In many cases, rectifying this condition can be expensive because the integral bridge approach slab (if provided) cannot be overlaid with pavement. To address this soil-structure interaction problem, the Virginia Department of Transportation conducted a study designed to test the feasibility of using elastic inclusion at the integral backwall. The design was completed in mid-1997, and the bridge was opened to traffic in October 1999. The bridge was constructed with elasticized expanded polystyrene (EPS) attached to the backwall. The structure has been monitored continuously for 5 years. Significantly attenuated lateral earth pressures have been recorded at the backwall, and the settlement of the approach fill has been tolerable. Field data indicate that the elasticized EPS layer has been functioning effectively in allowing the superstructure to interact with the adjoining select backfill material. The use of elasticized EPS in conjunction with a well-compacted granular backfill offers a cost-effective way of minimizing settlements at bridge approaches.
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:c83ccb6cabf29f686ca68fb49e1cc80156c1c0f860aa9f04db68b52dc84e77631e3941b8eba8a327ed437902ad6cc86ee4dd0758a54cac39db74bceb6d751470
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/19683/dot_19683_DS1.pdf
• File Type:
  [PDF - 1.94 MB ]