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.

    Language

    • English

    Project

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

      69A3551747107

    • 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

    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 10:47AM