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

项目名称：	SMART Shear Keys for Multi-Hazards Mitigation of Diaphragm-Free Girder Bridges - Phase III
摘要：	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.
状态：	Active
资金：	164918
资助组织：	Office of the Assistant Secretary for Research and Technology<==>Mid-America Transportation Center
项目负责人：	Stearns, Amy
执行机构：	Missouri University of Science & Technology, Rolla
开始时间：	20200323
预计完成日期：	20201231
主题领域：	Bridges and other structures；Construction；Design；Highways；Maintenance and Preservation