Design criteria for post and beam bents with drilled shafts.

Details

• Creators:
  Robinson, Brent ; Vidot, Aidcer ; Park, Young Jin ; Possiel, Ben ; Suarez, Vinicio ; Kowalsky, Mervyn ; Gabr, Mohammed
• Corporate Creators:
  North Carolina State University. Department of Civil Engineering
• Corporate Contributors:
  North Carolina. Dept. of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Bents
  • Beams
  • Shaft sinking
  • Bridge foundations
  • Bridges--North Carolina--Design and construction
  • Bridges--Foundations and piers--Testing
• Publication/ Report Number:
  FHWA/NC/2006-48
• Resource Type:
  Tech Report
• Geographical Coverage:
  North Carolina
• Edition:
  Final report; July 2005-June 2007.
• Corporate Publisher:
  North Carolina. Dept. of Transportation
• Abstract:
  The research work presented in the report addresses the potential areas of conservatism in the current practice related to bridge ; bents supported by drilled shafts and piles. The research encompasses modeling efforts and an experimental program. Modeling ; includes analysis of existing bridge case studies with drilled shaft foundations to characterize the impact of the current ; assumptions on sizing the various components of a bridge bent. An experimental program is performed to evaluate the ; connection stiffness, and to determine if a given connection has sufficient capacity to develop such stiffness and transfer moment ; The experimental program includes testing bearing pads in compression and shear to define their index properties. The bearing ; pads are then tested in a prototype bridge set up to measure their performance under simulated loading. ; An improved set of design guidelines and recommendations regarding the superstructure-substructure connection’s rotational ; stiffness, shaft/pile top boundary conditions, and resistance factors are proposed along with characterizing the impact of the ; current practice and various design assumptions on sizing components of bridge bents. Resistance factors are developed for ; drilled shafts, based on load test data from the state’s geologic regions, for compatibility with LRFD implementation. Work in ; the report serves to provide a better understanding of the performance of bents supported by drilled shafts under AASHTO ; loading conditions. Such understanding serves as a tool that provides NCDOT engineers with the flexibility of specifying the ; level of conservatism to be built into a specific bridge bent design.
  More +
• Format:
  PDF
• Funding:
  2006-15
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/17778/dot_17778_DS1.pdf
• File Type:
  [PDF - 17.38 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:eb5a28575145c6b8943b325075b444371253fde609b8f2b2eec0d53eb7dbd1f6