Download or read book Repair Method for Prestressed Girder Bridges written by Kent A. Harries and published by . This book was released on 2009 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is common practice that aging and structurally damaged prestressed concrete bridge members are taken out of service and replaced. This, however, is not an efficient use of materials and resources since the member can often be repaired in situ. There are numerous repair techniques proposed by entrepreneurial and academic institutions which restore prestressed concrete girder flexural strength and save both material and economic resources. Of course, not all repair methods are applicable in every situation and thus each must be assessed based on girder geometry and the objectives of the repair scenario. This document focuses on the practical application of prestressed concrete bridge girder repair methods. In this document, repair methods are presented for three prototype prestressed concrete highway bridge girder shapes: adjacent boxes (AB), spread boxes (SB), and AASHTO-type I-girders (IB), having four different damage levels. A total of 22 prototype repair designs are presented. Although not applicable to all structure types or all damage levels, the repair techniques covered include the use of carbon fiber reinforced polymer (CFRP) strips, CFRP fabric, near-surface mounted (NSM) CFRP, prestressed CFRP, post-tensioned CFRP, strand splicing and external steel post-tensioning. It is the authors' contention that each potential structural repair scenario should be assessed independently to determine which repair approach is best suited to the unique conditions of a specific project. Therefore, no broad classifications have been presented directly linking damage level (or a range of damage) to specific repair types. Nonetheless, it is concluded that when 25% of the strands in a girder no longer contribute to its capacity, girder replacement is a more appropriate solution. Guidance with respect to inspection and assessment of damage to prestressed concrete highway bridge girders and the selection of a repair method is presented. These methods are described through 22 detailed design examples. Based on these examples, review of existing projects and other available data, a detailed review of selection and performance criteria for prestressed concrete repair methods is provided. Best practices based on the study objectives are presented.

Download or read book Evaluation and Repair Procedures for Precast prestressed Concrete Girders with Longitudinal Cracking in the Web written by Maher K. Tadros and published by Transportation Research Board. This book was released on 2010 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report establishes a user's manual for the acceptance, repair, or rejection of precast/prestressed concrete girders with longitudinal web cracking. The report also proposes revisions to the AASHTO LRFD Bridge Design Specifications and provides recommendations to develop improved crack control reinforcement details for use in new girders. The material in this report will be of immediate interest to bridge engineers.

Download or read book Damage Evaluation and Repair Methods for Prestressed Concrete Bridge Members written by George O. Shanafelt and published by Transportation Research Board National Research. This book was released on 1980-01-01 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Guidelines for Evaluation and Repair of Prestressed Concrete Bridge Members written by George O. Shanafelt and published by Transportation Research Board National Research. This book was released on 1985 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Introduction to Concrete Bridge Repairs for Construction Managers written by J. Paul Guyer, P.E., R.A. and published by Guyer Partners. This book was released on 2022-05-22 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for construction managers interested in repair of concrete bridges. Here is what is discussed: ​​​​​​​Preventive Maintenance 1. INTRODUCTION, 2. SURFACE COATING, 3. JOINT MAINTENANCE, 4. CATHODIC PROTECTION Repair and Strengthen 5. GENERAL REQUIREMENTS, 6. CRACK REPAIRS, 7. SPALL REPAIR, 8. JOINT REPAIR, 9. ABUTMENTS AND WINGWALLS, 10. BRIDGE SEATS, 11. COLUMNS AND PILES, 12. STRINGERS AND BEAMS, 13. DECKS, 14. REPLACEMENT OF CONCRETE MEMBERS Upgrade Concrete Bridges 15. GENERAL UPGRADE METHODS, 16. STRENGTHEN INDIVIDUAL MEMBERS, 17. PRESTRESSED CONCRETE MEMBERS

Download or read book Repair of Concrete Bridges written by G. P. Mallett and published by Thomas Telford. This book was released on 1994 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a review of the repair, maintenance and protection of concrete bridges. This book summarizes information from conference papers, research and technical reports, and others. It aims to increase the expertise of structural engineers and safeguard the investment. It presents solutions to the problems and pitfalls that engineers encounter.

Download or read book Repair of Prestressed Concrete Bridge Girders for Shear written by Lionel Lemay and published by . This book was released on 1986 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Repair of Prestressed Concrete Girder Ends and Girder Collision Repair written by Chris P. Pantelides and published by . This book was released on 2010 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fiber reinforced polymer composites are an increasingly popular material that can be used for bridge girder retrofit/repair. The purpose of this research, therefore, is to develop methods and design guidelines for repair and retrofit of bridge girders suffering (1) shear strength deficiencies related to end cracking and (2) flexural strength deficiencies related to vehicular collision. Scaled test specimens were fabricated and subjected to cyclic loading in order to instigate damage similar to that caused by end cracking and vehicular collision. Subsequently, the damaged specimens were repaired with external post-tensioned carbon fiber rods and re-tested to failure. This report presents the data from the tests and design guidelines for the use of external post-tensioned carbon fiber rods for repair applications.

Download or read book Rehabilitation Techniques for Concrete Bridges written by Habib Tabatabai and published by . This book was released on 2005 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Method to Evaluate Remaining Prestress in Damaged Prestressed Bridge Girders written by Scott Adam Civjan and published by . This book was released on 1995 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book CFRP Repair of Impact Damaged Bridge Girders Volume 1 Strcutural Evaluation of Impact Damaged Prestressed Concrete 1 Girders Repaired with FRP Materials written by Perry Green and published by CreateSpace. This book was released on 2012-12-24 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a research project that was recently completed to assist the Florida Department of Transportation in establishing a list of acceptable methods for the repair of impact damaged pre-stressed concrete bridge girders using fiber reinforced polymer materials.

Download or read book Repair of Impact damaged Prestressed Concrete Bridge Girder Using Glass FRP Rebar written by Maria Angeles De La Flor Montero and published by . This book was released on 2015 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: Overpass girders are risked by the impact of the traffic, over height vehicle, travelling under the structure, creating a hazard for the drivers over and under the bridge. When a bridge girder is damaged the repair solution adopted has to meet the following criteria: - Safety. The repaired structure has to provide a minimum level of service to guarantee the safety of the traffic during the life of the structure. - Repair time: The repair time has to be minimized to limit risks and inconveniences for the traffic. - Economy. The adopted solution has not only to fulfill the previous requirements, but also has to be the most economical. Nowadays a lot of construction projects have to confront this kind of issue. The Lyndon B. Johnson (LBJ) Express construction project had to solve this problem. The LBJ project is located on I-635 and I-35 in North Dallas, Texas. The bridge number 54 of the LBJ project was hit by a truck, causing severe damage on one of its girders. The incident caused loss of concrete and exposed several strands. The solution adopted for the engineers was install fiber glass rebar and fill with repair mortar. This study models the damaged girder before and after the repair to analyze its structural behavior. The data obtained by this model have been compared to the data obtained by the field test. The ABAQUS software has been used to model the girder. The objectives of this study are provide a better understanding of the structural behavior and propose adequate modeling techniques of beams repaired with GFRP rebar. The proposed techniques will help to establish adequate repair procedures and to anticipate the structural behavior of damaged girders prior to the repair process

Download or read book Heat straightening Repair of Damaged Steel Bridge Girders written by Robert J. Connor and published by Transportation Research Board. This book was released on 2008 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB¿s National Cooperative Highway Research Program (NCHRP) Report 604: Heat-Straightening Repair of Damaged Steel Bridge Girders: Fatigue and Fracture Performance explores limits, based on fatigue and fracture performance, on the number of damage and repair cycles to which damaged steel bridge girders may be subjected using the heat-straightening procedure.

Download or read book Bridge Evaluation Repair and Rehabilitation written by A.S. Nowak and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt: Evaluation, repair and rehabilitation of bridges are increasingly important topics in the effort to deal with the deteriorating infrastructure. For example, in the United States about 40 percent of the nation's 570,000 bridges are classified, according to the Federal Highway Administra tion's (FHW A) criteria, as deficient and in need of rehabilitation and replacement. In other countries the situation is similar. FHW A estimates the cost of a bridge replacement and reha bilitation program at 50 billion dollars. The major factors that have contributed to the present situation are: the age, inadequate maintenance, increasing load spectra and environmental contamination. The deficient bridges are posted, repaired or replaced. The disposition of bridges involves clear economical and safety implications. To avoid high costs of replacement or repair, the evaluation must accurately reveal the present load carrying capacity of the struc ture and predict loads and any further changes in the capacity (deterioration) in the applicable time span. Accuracy of bridge evaluation can be improved by using the recent developments in bridge diagnostics, structural tests, material tests, structural analysis and probabilistic methods. There is a need for an international exchange of advanced experience to increase the research effi ciency. The Workshop is organized on the premise that the exchange of existing American and European experience in the area of bridge evaluation, repair and rehabilitation is beneficial for both parties involved.

Download or read book Repair of Impact Damaged Prestressed Concrete Girders Using Carbon Fiber Reinforced Polymers written by John David Rhodes and published by . This book was released on 2000 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Every year several prestressed concrete (P/C) girder bridges are damaged by overheight vehicles. Traditional P/C girder repair strategies include beam replacement, internal strand splices, external post-tensioning, and welded steel jackets. Unfortunately, these types of repairs are both labor intensive and vulnerable to future corrosion. One possible alternative to these traditional repair techniques is to repair/strengthen impact damaged P/C girders with carbon fiber reinforced polymers (CFRP). These types of materials have the advantage of large strength/weight ratios, excellent corrosion/fatigue properties, and are relatively simple to install. This report describes the experimental results from three full-sized P/C beams that were intentionally damaged to simulate vehicle impacts, repaired, and tested. Damage consisted of removing concrete from the bottom flange and severing a number of prestressing strands. The beams were strengthened/repaired by patching the bottom flange and installing multiple layers unidirectional CFRP to restore the original flexural capacity. CFRP fibers were also used in the transverse direction to help confine the patch material and to prevent premature debonding of the longitudinal sheets. Service level and ultimate load tests were conducted to determine the effectiveness of CFRP strengthening system. A theoretical analysis of the strengthened/repaired beams was also completed. In addition to the full-size beams, a number of smaller specimens were also used to address durability and environmental concerns related to the use CFRP on bridge structures.

Download or read book Evaluation and repair of impact damaged prestressed concrete bridge girders written by Robert Steven Zobel and published by . This book was released on 1996 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Repair of Impact Damaged Prestressed Concrete Bridge Girders Using Carbon Fiber Reinforced Polymer CFRP Materials written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Over-height vehicles impacting prestressed concrete (PS) and reinforced concrete (RC) bridge girders is a frequent problem experienced by the majority of transportation departments all over the world. The most common practice used to restore a damaged bridge is to cut out the damaged girder and replace it with a new one. More recently, alternative methods have been examined to help decrease the costs of replacing damaged girders and minimizing closure time. The research reported in this thesis considered three scenarios to examine the effectiveness of using Carbon Fiber Reinforced Polymers (CFRP) to restore impact-damaged PS girders to their original capacity. The first scenario investigated the effectiveness of CFRP sheets to repair a 54 ft (16.4 m) long girder with one ruptured prestressing strand caused by an over-height vehicle impact. The second scenario investigated the effectiveness of CFRP sheets to repair two 54 ft (16.4 m) long girders with various numbers of prestressing strands ruptured artificially at midspan. The final scenario examined the effectiveness of CFRP sheets to repair a shear-critical specimen with four prestressing strands artificially ruptured near the support. The design of all CFRP repair systems was conducted using a cracked section analysis and/or guidelines for shear capacity of prestressed members. The predictions according to the two approaches compared well with the measure values. The designs were compared to current codes and a recently developed debonding model. All of the repaired girders were able to reach and surpass their respective undamaged capacities. All of the flexural tests failed due to crushing of concrete and exhibited ductility even higher than the predicted value for the undamaged specimens.