详情

SMART Shear Keys for Tsunami/Storm Surge-Hazards Mitigation of Concrete Girder Bridges

项目名称：	SMART Shear Keys for Tsunami/Storm Surge-Hazards Mitigation of Concrete Girder Bridges
摘要：	In recent years, transportation infrastructures have been exposed to increasing hydraulic hazards, such as tsunamis and storm surges. In 2011, a devastating tsunami triggered by a Mw 9.0 earthquake struck Japan, 252 bridges were severely damaged. Most of the bridges worked normal after the earthquake load but failed after its associated tsunami loading due to the combination effect of buoyancy and overturning. Storm surges associated with the 2005 Hurricane Katrina floated and displaced many superstructures of bridges when end diaphragms and girders trapped air under water, dropping the bridge spans into water. The goal of this multi-phase proposal is not only to prevent the floated-and-displaced bridge superstructures but also to limit the damage of bridge substructures under tsunami/storm surge events by exploring and developing a novel concept of concrete-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 capbeam support, the key provides controllable horizontal and vertical friction forces during natural hydraulic hazards and regulate corresponding displacements over time. This shear key will not only constrain the displacement of the bridge superstructure under floating and overturning loads, but also dissipate hysteresis energy to enhance the safety of the bridge substructure.
状态：	Active
资金：	407378
资助组织：	Office of the Assistant Secretary for Research and Technology
管理组织：	Mid-America Transportation Center
项目负责人：	Stearns, Amy
执行机构：	Missouri University of Science and Technology
主要研究人员：	Chen, Genda
开始时间：	20220201
预计完成日期：	20230630
主题领域：	Bridges and other structures；Construction；Design；Highways；Maintenance and Preservation