Date of Award
Master of Science
Civil, Construction, and Environmental Engineering
Many transportation organizations have embraced Accelerated Bridge Construction (ABC) to reduce both the traffic impacts and societal costs. One of the most common means to achieve ABC is to utilize prefabricated elements, which are connected together on-site to construct a bridge. ABC will not be effective if the barrier requires cast-in-place construction. The purpose of this report is to present details of a precast barrier and two connection alternatives between the deck and precast barriers. In addition, a new connection between two adjacent prefabricated barriers is presented.
One barrier to deck connection uses inclined reinforcing bars with threaded ends that get connected to bar splicers embedded in the bridge deck. The other barrier to deck connection uses u-shaped bars that are inserted into the barrier from the underside of the bridge deck overhang. Factors that were considered when designing the connections were minimal damage to deck, easy replacement of barrier, constructability, durability, and cost. The barrier to barrier connection utilizes headed reinforcement in the longitudinal and transverse directions. The connections were designed to meet TL-4 loads as per MASH and LRFD Bridge Design Specifications. The report presents results from of various tests and show that all proposed connections are viable for accelerated construction of concrete barriers though some refinement to the tested details will be needed.
Ashley A Ecklund
Ecklund, Ashley A., "Precast concrete bridge barriers for accelerated bridge construction" (2019). Graduate Theses and Dissertations. 17008.