Condition assessment and methods of abatement of prestressed concrete box-beam deterioration, phase II : volume 1.
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2009-04-13
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Edition:Final rept.; 2006-2008.
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Abstract:Side-by-side box-beam bridge constitutes approximately 17 percent of bridges built or replaced annually on ; public roads and there is a renewed thrust to use this bridge type for rapid construction under the Highway for ; LIFE program. Further, failure of a fascia girder of Lakeview Drive bridge in Pennsylvania on December 27, ; 2005 and with a large number of aging bridges in the U.S., highway agencies are concerned about the safety of ; similar bridges. This project was developed to evaluate the capacity of distressed box-beam through load testing; ; investigate the impact of distress types identified during phase I of this project on flexure and shear capacities of ; a beam in a structural system; identify proper materials and methods for long lasting repairs to improve the ; structural integrity of distressed box-beam bridges; and by performing simulations of the construction process ; using finite element (FE) models investigate stresses developed in components during each stage of construction ; and under operation, develop recommendations for changes or modifications to the design procedures, ; construction process, material specifications, and to the maintenance and repair techniques of side-by-side boxbeam ; bridge deck. ; Six tasks were performed in this project ranging from literature review, instrumentation and load testing of a ; severely deteriorated fascia beam, laboratory investigation of fresh and hardened (durability) properties of shear ; key grout and repair materials, evaluation of mechanical properties of shear key grout and repair materials, ; construction process simulation, and evaluation of flexural and shear capacities of distressed beams considering ; structural system behavior. ; Recommendations of this project include selection of repair and shear key material, development of ; comprehensive inspection procedures to assure bridge safety and implementation of the rational design procedure ; given in the report for improved durability.
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