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Author : Robert Steven Zobel
Publisher :
ISBN 13 :
Total Pages : 191 pages
Book Rating : 4.:/5 (378 download)
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:
Author : Robert Steven Zobel
Publisher :
ISBN 13 :
Total Pages : 736 pages
Book Rating : 4.:/5 (389 download)
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 736 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Perry Green
Publisher : CreateSpace
ISBN 13 : 9781481821605
Total Pages : 196 pages
Book Rating : 4.8/5 (216 download)
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.
Author : University of Florida. Department of Civil and Coastal Engineering
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (79 download)
Download or read book CFRP Repair of Impact-damaged Bridge Girders written by University of Florida. Department of Civil and Coastal Engineering and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Maher K. Tadros
Publisher : Transportation Research Board
ISBN 13 : 0309118352
Total Pages : 76 pages
Book Rating : 4.3/5 (91 download)
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.
Author : Perry S. Green
Publisher :
ISBN 13 :
Total Pages : 370 pages
Book Rating : 4.:/5 (577 download)
Download or read book CFRP Repair of Impact-damaged Bridge Girders written by Perry S. Green and published by . This book was released on 2004 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : George O. Shanafelt
Publisher : Transportation Research Board National Research
ISBN 13 :
Total Pages : 96 pages
Book Rating : 4.3/5 (555 download)
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:
Author : Kent A. Harries
Publisher :
ISBN 13 :
Total Pages : 169 pages
Book Rating : 4.:/5 (753 download)
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 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.
Author : Ali Alfailakawi
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (125 download)
Download or read book Experimental and Analytical Evaluation of Residual Capacity of Corrosion-Damaged Prestressed Concrete Bridge Girders written by Ali Alfailakawi and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The durability of infrastructure components, such as prestressed concrete bridge beams, can be significantly affected by long-term deterioration associated with corrosion. Corrosion is a major concern for bridges in Virginia, due to the frequent use of deicing salts during the winter, as well as the number of structures in marine environments. The residual capacity of corrosion damaged prestressed I-beams and box beams needs to be accurately estimated to determine if damaged bridges need to be posted, and to help with making informed decisions related to repair, rehabilitation and replacement of damaged bridges. This report presents the results of testing of six corrosion-damaged prestressed beams removed from existing bridges during their demolition. Three beams were Type II AASHTO I-beams extracted from the Lesner Bridge in Virginia Beach, and three were 48 in wide by 27 in deep box beams extracted from the Aden Road Bridge near Quantico, Virginia. Prior to testing, the beams were visually inspected and two types of non-destructive evaluations were performed to identify corrosion activity: resistivity measurements and half-cell potential measurements. The beams were then tested in the lab to determine their flexural strength. Following testing, samples of strand were removed and tested to determine their tensile properties. Cores were taken from the Aden Road beams and from both the beams and decks of the Lesner Bridge beams to determine compressive strength. Powdered concrete samples were removed to perform chloride concentration tests. The tested strengths of the beams were compared to calculated strengths using two methods for damage estimation and two different calculation approaches. The methods for damage estimation relied exclusively on visual inspections; one was the set of methods recommended by Naito et al. (2010), while the second was a modified method developed in this study from the current tests. The two calculation approaches were a strain compatibility method and the AASHTO LRFD method. Overall, the results yielded reasonable estimates of residual strength, except for one of the box beams that was discovered to have considerable water within the hollow cells. The final recommendations are that bridge inspectors develop detailed damage maps of corrosion-damaged beams, and that load raters use the Naito et al. method to get a conservative estimate of damage for both box beams and I-beams. Either method for calculating strength is valid, however the AASHTO LRFD method is simpler.
Download or read book NCHRP Report 654 written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Scott Adam Civjan
Publisher :
ISBN 13 :
Total Pages : 86 pages
Book Rating : 4.:/5 (359 download)
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:
Author : Kimberly Lammert
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (547 download)
Download or read book Structural Evaluation of Impact Damaged Prestressed Concrete I Girders Repaired with Fiber Reinforced Polymer (FRP) Materials written by Kimberly Lammert and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: The FRP systems varied in material types, laminate properties, application procedures, reinforcing schemes, and repair design procedures and assumptions. The specimens were tested to failure to determine moment and shear capacities, as well as deformation and ductility behavior of the undamaged, damaged, and repaired girders. Through experimental and analytical comparisons of the behavior of the repaired girders to the undamaged girder, the specific FRP systems were evaluated for acceptance to the FDOT Quality Products List. The FRP systems were evaluated structurally based on their ability to restore the undamaged shear and moment capacity of the prestressed concrete girder, type of failure mode, cost of repair system including installation, and ease of installation.
Author : Anthony David Miller
Publisher :
ISBN 13 :
Total Pages : 155 pages
Book Rating : 4.:/5 (772 download)
Download or read book Repair of Impact-damaged Prestressed Concrete Bridge Girders Using Carbon Fiber Reinforced Polymer (CFRP) Materials written by Anthony David Miller and published by . This book was released on 2006 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: impact damage, flexure modeling, shear modeling, CFRP repair, prestressed concrete, bridge girder.
Author : Félix Domínguez Mayans
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (112 download)
Download or read book Analysis of a Damaged and Repaired Pre-stressed Concrete Bridge Girder by Vehicle Impact and Effectiveness of Repair Procedure written by Félix Domínguez Mayans and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis aims to study the structural consequences of the damages produced by vehicle impact in a pres-stressed concrete bridge girder and the repair procedure in a real case-study damaged after the bridge was opened to service. From the analysis of the situation of the beam and its damage state, a study of the repair actions carried out on this beam has been analyzed in order to determine the efficiency of the repair and if other alternatives are possible or more efficient. A state of the art and current practice review for repairing similar damages is carried out in this thesis. This literature review is focused on the repair methods and techniques studied in the United States of America, where this thesis was performed. Furthermore, all repair methods are classified depending on the type of girder damage (minor, moderate and severe). This damage classification aims to avoid inefficient and improper repair actions. The most complex techniques are usually used with severe damage. After all techniques are studied and classified a repair strategy is proposed. Based on the information, concepts and techniques analyzed in the literature review, a repair procedure for a pres-stressed concrete bridge girder is proposed. All necessary steps to have a proper repair are carried out. Then, once repair strategy is proposed, a real case is studied. Following the repair strategy proposed, all steps needed to repair a pre-stressed concrete bridge girder damaged by vehicle impact are carried out. Doing this way, the suitability of the strategy proposed. A deeper understanding of the method used in this case and the process followed in its implementation is detailed. After the procedure is studied, an analysis of data from load tests performed on the beam before and after repair were made is done. With the data obtained from load tests a study of the correlation of results are done in order to obtain conclusions after repair. Finally, a simulation of the case-study is carried out in order to identify the effects of the damage in the bridge deck, structural response and the efficiency of the repair. This simulation is done using SAP 2000 structural analysis software.
Author : John David Rhodes
Publisher :
ISBN 13 :
Total Pages : 232 pages
Book Rating : 4.:/5 (449 download)
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.
Author : A.S. Nowak
Publisher : Springer Science & Business Media
ISBN 13 : 9400921535
Total Pages : 618 pages
Book Rating : 4.4/5 (9 download)
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.
