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

In recent years, ground transportation infrastructure has been exposed to an increasingly large number of natural hazards, such as earthquakes, tsunamis, and hurricanes. During the 2010 Chile Earthquake, a number of girder bridges lost spans or rotated with transverse offset, causing out-of-plane rupture of concrete girders and flexural damage to lateral restrainers. Storm surges associated with Hurricane Katrina in 2005 floated and displaced some bridge superstructures when end diaphragms and girders trapped air under water, dropping the bridge spans into water. The goal of this multi-phase proposal is to prevent the above failures 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 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 support, the key provides controllable lateral and vertical friction forces during natural hazards and regulates corresponding displacements over time. The first phase aims to: 1) characterize novel SMART shear keys under cyclic loads, 2) develop a friction-gap model of the shear keys for inclusion in computational modeling and simulation of bridges, and 3) understand and evaluate the effect of SMART keys on the seismic behavior of a small-scale bridge system subjected to ground accelerations. These objectives will be achieved through experimental and computational research in laboratory.

    Language

    • English

    Project

    • Status: Active
    • Funding: $161160
    • Contract Numbers:

      69A3551747107

    • Sponsor Organizations:

      Mid-America Transportation Center

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

      Office of the Assistant Secretary for Research and Technology

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

      Mid-America Transportation Center

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

      Hartnagel, Bryan

    • Performing Organizations:

      Missouri University of Science & Technology, Rolla

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

      Chen, Genda

    • Start Date: 20170801
    • Expected Completion Date: 20181204
    • Actual Completion Date: 0
    • USDOT Program: University Transportation Centers

    Subject/Index Terms

    Filing Info

    • Accession Number: 01659650
    • Record Type: Research project
    • Source Agency: Mid-America Transportation Center
    • Contract Numbers: 69A3551747107
    • Files: UTC, RiP
    • Created Date: Feb 8 2018 2:07PM