SMART Shear Keys for Multi-Hazards Mitigation of Diaphragm-Free Girder Bridges - Phase III

The goal of this multi-phase project is to prevent the out-of-plane rupture of concrete girders and flexural damage to lateral restrainers under earthquake loads and floated-and-displaced bridge superstructures under hurricane events by exploring and developing a novel concept of diaphragm-free girder bridges with Sliding, Modular, Adaptive, Replaceable, and Two-dimensional (SMART) shear keys. Each key is composed of three precast concrete modules arranged in an L-shape that are horizontally and vertically post-tensioned with replaceable unbonded steel bars to form two wedged sliding surfaces. When installed next to a girder and anchored into its capbeam support, the key provides controllable horizontal and vertical friction forces during natural hazards and regulates corresponding displacements over time. The Phases I and II of this project were mainly focused on: 1) characterizing and modeling novel SMART shear keys under cyclic loads, 2) understanding and evaluating the effect of SMART keys on the seismic behavior of a small-scale bridge bent and a simplified highway bridge subjected to ground accelerations, 3) developing a strategy and algorithm for optimal placement of SMART shear keys, and 4) understanding and developing a similitude law of SMART shear keys for the prediction of their behavior and responses through small-scale model tests. The Phase III of this project is mainly to understand and model the tsunami behavior of bridge superstructures with SMART keys. Specifically, it will conduct small-scale model tests under broken and unbroken waves and develop the drag, lift, and moment coefficients as a function of friction force.


  • English


  • Status: Completed
  • Funding: $164918
  • Contract Numbers:


  • Sponsor Organizations:

    Office of the Assistant Secretary for Research and Technology

    University Transportation Centers Program
    Department of Transportation
    Washington, DC  United States  20590

    Mid-America Transportation Center

    University of Nebraska-Lincoln
    2200 Vine Street, PO Box 830851
    Lincoln, NE  United States  68583-0851
  • Managing Organizations:

    Mid-America Transportation Center

    University of Nebraska-Lincoln
    2200 Vine Street, PO Box 830851
    Lincoln, NE  United States  68583-0851
  • Project Managers:

    Stearns, Amy

  • Performing Organizations:

    Missouri University of Science & Technology, Rolla

    Department of Engineering
    202 University Center
    Rolla, MO    65409
  • Principal Investigators:

    Chen, Genda

  • Start Date: 20200323
  • Expected Completion Date: 20201231
  • Actual Completion Date: 0
  • USDOT Program: University Transportation Centers Program
  • Source Data: RiP Project 91994-52

Subject/Index Terms

Filing Info

  • Accession Number: 01738627
  • Record Type: Research project
  • Source Agency: Mid-America Transportation Center
  • Contract Numbers: 69A3551747107
  • Files: UTC, RIP
  • Created Date: Apr 30 2020 3:17PM