Impact of Construction Eccentricity on Direct Pier-to-Pile Connections for Permanently Cased Shaft (CFST) Piles

For seismic design of transportation structures, there are competing demands including: economy, strength, stiffness, inelastic deformation capacity, and seismic resilience. Prior research at the University of Washington (UW) demonstrates that concrete-filled steel tubes (CFSTs) can meet these competing demands. This proposed research builds on the prior CFST research to develop direct pier-to-pile connections specific for use in wide range of transportation systems including bridges, high speed rail (HSR), and port structures. Initially finite element analyses (FEA) were conducted to develop the connection and experimental test matrix. Specific study parameters include embedment depth and the addition of a ring to enhance mechanical bond. This initial study resulted in an initial test matrix that is currently being conducted, to study these aspects of the connections. However, there is an important, yet unstudied parameter, which is the placement of the reinforcing steel cage. In construction, it is likely that the pier will not be placed at the exact center of the pile, but instead will be placed with some eccentricity relative to the center of the pile. This eccentricity is likely to be very important but is not possible to study analytically. Here, it is proposed to investigate the impact of eccentricity on the transfer mechanism and damage using large-scale experimental specimens. It is expected that two tests will be conducted which will be complementary with and extend current research that is being sponsored by Pacific Earthquake Engineering Research (PEER) center (referred to as PEER herein). The results will be used to determine design methods and nonlinear analytical models for these new connections.

Language

• English

Project

• Status: Active
• Funding: $70000
• Contract Numbers:

  69A3551747121

• Sponsor Organizations:

  Accelerated Bridge Construction University Transportation Center (ABC-UTC)

  Florida International University
  10555 W. Flagler Street
  Miami, FL  United States  33174

  Office of the Assistant Secretary for Research and Technology

  University Transportation Centers Program
  Department of Transportation
  Washington, DC  United States  20590
• Start Date: 20210101
• Expected Completion Date: 20230804
• Actual Completion Date: 0

Subject/Index Terms

• TRT Terms: Bridge construction; Bridge piers; Earthquake resistant design; Eccentricity; Reinforcing steel; Structural connection; Support piles; Tubing
• Subject Areas: Bridges and other structures; Construction; Design; Highways; Materials;

Filing Info

• Accession Number: 01769371
• Record Type: Research project
• Source Agency: Accelerated Bridge Construction University Transportation Center (ABC-UTC)
• Contract Numbers: 69A3551747121
• Files: UTC, RIP
• Created Date: Apr 12 2021 3:37PM