Engineering Commons^™

Evaluation Of Experimental Bridges In Tennessee, David P. Chapman

Doctoral Dissertations

This dissertation presents an overview and evaluation of an effort of the Tennessee Department of Transportation (TDOT) to design multispan steel girder bridges that can be erected with minimal disruption to traffic passing under the proposed spans. TDOT has developed the Pier-Plate Moment Connection in order to facilitate the accelerated construction of steel girder bridges. This connection allows the girders of a multispan steel bridge to be erected as simple spans and then to be made continuous prior to the dead load of the deck being applied. Since 2003, the Department of Civil and Environmental Engineering at the University of …

Effectiveness Of Stop Sign Installations At Highway-Railroad Grade Crossings: An Evaluation Of Installation Safety Performance, Harold Lynn Millegan

Doctoral Dissertations

The safety benefit of Stop-sign treatment employed at passive highway rail crossings has been a subject of research for many years. The objective of this study is to assess the effectiveness and impacts of Stop-sign treatment on crossing safety. This research addresses safety at public highway-railroad grade crossings across the United States within a 26-year period of accident history for Crossbucks-only controlled crossings that were upgraded to Stop-sign control.

This study utilized Federal Railroad Administration (FRA) accident data to investigate average accident frequency at crossings with the two different types of passive-crossing sign controls. The research database was created by …