Seismic Rehabilitation of Skewed and Curved Bridges Using A New Generation of Buckling Restrained Braces

The objective of this project is to find effective configurations for using buckling restrained braces (BRBs) in both skewed and curved bridges for reducing the effects of strong earthquakes. Verification is performed by numerical simulation using analytical models of existing bridges when BRBs are implemented for control of seismic forces. The effect of ground motion incidence angle on the responses of skewed bridges retrofitted with BRBs in the bents is evaluated. A three-span skewed bridge with no retrofit was used as a baseline case. The assessment is carried out in OpenSees using a model that accounts for the BRBs between bent columns, abutment, and shear keys, as well as soil-structure interaction effects. The models are subjected to 21 far-field ground motions, and the maximum response under 11 incidence angles is obtained. The two components in each ground motion set are first rotated to their principal directions to minimize correlation among horizontal orthogonal directions. Thereafter, the ground motion components are scaled to the maximum considered earthquake (MCE) level. The effect of pounding was investigated for curved bridges considering soil-structure interaction effects. A non-linear finite element model of the bridge was used to investigate structural pounding by performing time history analyses of strong motion earthquake records scaled to site conditions. Pounding between girders and abutments, between girders at expansion joints, and at shear keys was modeled when soil-structure interaction effects were considered using linear link elements. BRBs were modeled between girders and abutment, between girders at expansion joints and in the transverse direction at shear keys using non-linear links. Incremental dynamic analysis was used to assess the bridge performance under various earthquake scenarios with and without BRBs.

• Record URL:
  https://www.ugpti.org/resources/reports/details.php?id=862
• 
• Summary URL:
  https://rosap.ntl.bts.gov/view/dot/31881
• Record URL:
  https://rosap.ntl.bts.gov/view/dot/31880
• 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
  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
  • Ibarra, Luis
  • Wang, Yuandong
  • Upadhyay, Anurag
• Publication Date: 2016-12

Language

• English

Media Info

• Media Type: Digital/other
• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: 120p

Subject/Index Terms

• TRT Terms: Braces; Buckling; Curved bridges; Earthquake resistant design; Evaluation and assessment; Finite element method; Rehabilitation; Simulation; Skew bridges; Soil structure interaction; Structural analysis
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways;

Filing Info

• Accession Number: 01626571
• Record Type: Publication
• Report/Paper Numbers: MPC 16-315
• Contract Numbers: project 421
• Files: UTC, NTL, TRIS, ATRI, USDOT
• Created Date: Feb 27 2017 9:25AM