Bridge Analysis, Design and Repair

Single Abstract

340220 - Rehabilitation of Distressed End Regions of PC Bridge Girders using Innovative Materials

Saturday, April 21
8:00 AM - 9:30 AM
Location: 201B

The damage to the end regions of prestressed concrete (PC) bridge girders is one of the most common forms of aging and deterioration, especially for bridges located in cold climates. This type of damage is primarily attributed to two factors, namely: 1) leakage of water and deicing chemicals into the expansion joint located above the beam ends causing severe corrosion of reinforcement and cracking/spalling of concrete; and 2) expansion and contraction of already cracked concrete due to freeze-thaw cycles. To avoid the extremely costly option of replacing the entire girder with damaged end regions, one remedy that has been followed is to replace the distressed concrete with high strength fast setting grout. This option is mainly used to restore the geometry of the damaged region. However, there has been concerns among bridge engineers related to the efficacy of this approach under short shear spans where the beam end behaves as a D-region. To address this problem that faces many state departments of transportation (DOTs) in the U.S., this study presents an experimental and numerical investigation into the behavior of distressed end regions of PC bridge girders. The study also compares several repair techniques to restore the structural integrity and capacity of damaged girders. The experimental program carried out in this research involves five full-scale AASHTO I-girders extracted from the field and tested in the laboratory under three-point bending. Consistent damages are introduced at the ends of the girders to mimic severe distress conditions. The intentionally damaged girders are then repaired using various methods including: 1) application of high strength mortar, 2) application of fiber reinforced polymer (FRP) laminates, 3) application of near surface mounted (NSM) FRP bars, and 4) application of prestressed shape memory alloy (SMA) reinforcing wires. To understand in more depth the feasibility of using the strut and tie approach to analyze the behavior of these repair methods, the experimental tests are modeled and analyzed in 3-D using finite element (FE) software ABAQUS. The experimentally calibrated FE models are used to investigate the impact of out-of-plane behavior at the end D-region on the efficacy of different types of repair. Finally, recommendations on the design and detailing of repair techniques of distressed end regions are discussed.

Hang Zhao

University of Illinois at Urbana-Champaign

n/a

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Bassem Andrawes

Associate Professor
University of Illinois at Urbana-Champaign

Prof. Andrawes is an Associate Professor and Excellence Faculty Fellow in the Department of Civil and Environmental Engineering at the University of Illinois at Urbana-Champaign. He holds a Ph.D. in Civil Engineering (Structures) from Georgia Institute of Technology. Prior to joining the University of Illinois in 2006, Professor Andrawes worked as a Postdoctoral Scholar at the University of California Irvine and a Design Engineer at Englekirk Partners Consulting Structural Engineers in Santa Ana, California. Professor Andrawes research interests are in the areas of Structural Applications of Smart and Advanced Materials, Earthquake Engineering, Reinforced/Prestressed Concrete Structures, and Seismic Retrofitting of Structures. Prof. Andrawes has an active leading role in several professional societies and technical committees including the American Society of Civil Engineers (ASCE), American Concrete Institute (ACI), and the Precaset/Prestressed Concrete (PCI). He is the founding chair of the SEI/ASCE subcommittee on "Retrofit of Structures under Dynamic Loads".

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