Enhancing Site Response Analysis for Bridge Infrastructure in the Southern Plains Region: Issues, Pitfalls, and Pathways to Improvement

Bridges in the Southern Plains Region are essential to the continuity and resilience of the regional transportation network. Although traditionally considered a region of moderate seismic hazard, past seismic events and updated hazard characterizations along with escalating bridge costs have highlighted the need for the additional use of site response analysis in seismic bridge design. This project aims to investigate and resolve key technical limitations in current site response analysis practices as applied to bridge infrastructure within the Southern Plains Region. These include discrepancies in design acceleration estimation between American Association of State Highway and Transportation Officials (AASHTO) general procedure and site-specific site response analyses, the influence of bedrock shear wave velocity on seismic hazard and amplification, the sensitivity of site response outcomes to input motion depth, and the comparative accuracy of equivalent-linear and nonlinear modeling approaches under varying site conditions. The project will utilize detailed geotechnical and seismic data from existing Southern Plains Transportation Center (SPTC), Arkansas Department of Transportation (ARDOT), and U.S. Geological Survey (USGS) efforts to assess representative bridge sites, ultimately producing evidence-based recommendations and tools for more reliable seismic design and evaluation of bridge systems throughout the Southern Plains Region. There are four objectives of this project. The first is to quantify discrepancies in fundamental period and design spectrum estimates between the AASHTO general procedure and site-specific site response analysis across varying geologic conditions. The second is to evaluate the sensitivity of site response predictions and Probabilistic Seismic Hazard Analysis results to different bedrock shear wave velocity assumptions, including stiff soil and rock layers. The third is to assess the influence of varying ground motion input depths—from shallow to deep—on spectral amplification and response characteristics for deep basin sites. The last is to compare equivalent-linear and fully nonlinear site response analyses to establish practical modeling guidelines based on site condition, shaking intensity, and data availability. Project tasks include (1) literature review, (2) site selection and data complication, (3) baseline site response analysis, (4) comparative and sensitivity analysis, (5) guideline development, (6) reporting, and (7) dissemination.

• Record URL:
  • https://www.sptc.org/cy3-uark-02

Language

• English

Project

• Status: Active
• Funding: $134,243.00
• Contract Numbers:

  69A3552348306 (CY3-UARK-02)

• Sponsor Organizations:

  Southern Plains Transportation Center

  University of Oklahoma
  202 W Boyd St, Room 213A
  Norman, OK  United States  73019

  Office of the Assistant Secretary for Research and Technology

  University Transportation Centers Program
  Department of Transportation
  Washington, DC  United States  20590
• Managing Organizations:

  University of Oklahoma, Norman

  School of Civil Engineering and Environmental Science
  202 West Boyd Street, Room 334
  Norman, OK  United States  73019
• Project Managers:

  Ghasemi, Hamid

• Performing Organizations:

  University of Arkansas, Fayetteville

  4190 Bell Engineering
  Civil Engineering
  Fayetteville, Arkansas  United States  72701
• Principal Investigators:

  Wood, Clinton

• Start Date: 20260101
• Expected Completion Date: 20270101
• Actual Completion Date: 0
• USDOT Program: UTC

Subject/Index Terms

• TRT Terms: Bridge construction; Earthquake resistant design; Geotechnical engineering; Hazard analysis; Seismicity; Shear properties
• Identifier Terms: American Association of State Highway and Transportation Officials
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; Planning and Forecasting;

Filing Info

• Accession Number: 01975760
• Record Type: Research project
• Source Agency: Southern Plains Transportation Center
• Contract Numbers: 69A3552348306 (CY3-UARK-02)
• Files: UTC, RIP
• Created Date: Jan 6 2026 5:14PM