Seismic Rehabilitation of Reinforced Concrete Bridge Wall Piers

Reinforced concrete bridge wall piers constructed using older codes perform inadequately during strong earthquakes; deficiencies include short reinforcement lap splices, insufficient steel reinforcement ratios in the longitudinal and transverse direction, and inadequate seismic detailing. Three half-scale wall piers were constructed using as-built reinforcement details conforming to older bridge codes; an identical fourth specimen was constructed using current seismic code-compliant reinforcement details. A total of six quasi-static cyclic tests were conducted regarding the weak axis of the wall piers: (i) as-built test of first wall pier, (ii) test of modern code-compliant pier, (iii) retrofit test of second as-built pier using vertical and horizontal carbon fiber reinforced polymer (CFRP) anchors and jackets (R1), (iv) retrofit test of third as-built pier using near surface mounted (NSM) CFRP rods, horizontal CFRP anchors and jackets (R2), (v) repair test of first as-built pier using mild steel NSM bars, horizontal CFRP anchors and jackets (ABRP), and (vi) repair test of code-compliant pier using a CFRP shell with vertical headed steel bars for relocating the plastic hinge (MCRP). The two retrofit methods increased initial stiffness of the as-built pier by 110%, the lateral load-carrying capacity by 73%, and the hysteretic energy dissipation capacity by 67%. The repair method of the as-built pier increased initial stiffness of the as-built pier by 50% and load-carrying capacity by 73% with similar hysteretic energy dissipation. The repair method of the code-compliant pier increased the initial stiffness by 31%, load-carrying capacity by 15%, and hysteretic energy capacity by 55% for lateral displacements that reached a 6% drift ratio.

• Record URL:
  https://www.ugpti.org/resources/reports/details.php?id=982
• Record URL:
  https://rosap.ntl.bts.gov/view/dot/62070
• Supplemental Notes:
  • This document was sponsored by the U.S. Department of Transportation, University Transportation Centers Program.
• Corporate Authors:

  University of Utah, Salt Lake City

  Department of Civil and Environmental Engineering
  122 South Central Campus Drive, Suite 104
  Salt Lake City, UT  United States  84112

  Mountain-Plains Consortium

  North Dakota State University
  Fargo, ND  United States  58108

  Office of the Assistant Secretary for Research and Technology

  University Transportation Centers Program
  Department of Transportation
  Washington, DC  United States  20590
• Authors:
  • Pantelides, Chris P
  • Kunwar, Bhaskar
  • McEntee, Vanessa
• Publication Date: 2019-12

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References; Tables;
• Pagination: 121p

Subject/Index Terms

• TRT Terms: Bearing capacity; Bridge piers; Building codes; Cyclic tests; Dissipation; Earthquake resistant design; Fiber reinforced polymers; Rehabilitation; Reinforced concrete bridges; Retrofitting; Stiffness
• Subject Areas: Bridges and other structures; Construction; Highways; Maintenance and Preservation; Materials;

Filing Info

• Accession Number: 01733984
• Record Type: Publication
• Report/Paper Numbers: MPC-19-410
• Contract Numbers: MPC-526
• Files: UTC, NTL, TRIS, ATRI, USDOT
• Created Date: Mar 20 2020 4:24PM