Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Repair Of Impact Damaged Prestressed Concrete Bridge Girder Using Glass Frp Rebar
Download Repair Of Impact Damaged Prestressed Concrete Bridge Girder Using Glass Frp Rebar full books in PDF, epub, and Kindle. Read online Repair Of Impact Damaged Prestressed Concrete Bridge Girder Using Glass Frp Rebar ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Repair of Impact-damaged Prestressed Concrete Bridge Girder Using Glass FRP Rebar by : Maria Angeles De La Flor Montero
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
Book Synopsis CFRP Repair of Impact-Damaged Bridge Girders Volume 1 -- Strcutural Evaluation of Impact Damaged Prestressed Concrete 1 Girders Repaired with FRP Materials by : Perry Green
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.
Book Synopsis Repair of Impact-damaged Prestressed Concrete Bridge Girders Using Carbon Fiber Reinforced Polymer (CFRP) Materials by : Anthony David Miller
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.
Book Synopsis Repair of Impact-Damaged Prestressed Concrete Bridge Girders Using Carbon Fiber Reinforced Polymer (CFRP) Materials by :
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.
Book Synopsis Repair of Impact Damaged Prestressed Concrete Girders Using Carbon Fiber Reinforced Polymers by : John David Rhodes
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.
Book Synopsis CFRP Repair of Impact-damaged Bridge Girders by : University of Florida. Department of Civil and Coastal Engineering
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:
Book Synopsis CFRP Repair of Impact-damaged Bridge Girders by : Perry S. Green
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:
Book Synopsis Carbon Fiber Reinforced Polymer Repairs of Impact-damaged Prestressed I-girders by : Ryan J. Brinkman
Download or read book Carbon Fiber Reinforced Polymer Repairs of Impact-damaged Prestressed I-girders written by Ryan J. Brinkman and published by . This book was released on 2012 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three different Carbon Fiber Reinforced Polymer (CFRP) repair techniques are examined to determine how effectively each method can restore the ultimate flexural capacity of impact-damaged prestressed concrete girders. The number of severed prestressing strands and the amount of CFRP repair material applied are varied to create a large repair matrix. The ultimate moment capacity was calculated using the program XTRACT. Capacities were also evaluated using AASHTO and ACI specifications. The prototype girder's geometry is based on an impact-damaged I-girder from a bridge in Eastland County, Texas, which was repaired using CFRP in 2006 using conventional externally bonded CFRP. The CFRP repair methods examined in this study were near surface mounted (NSM) CFRP, externally bonded (EB) CFRP, and bonded post tensioned (bPT) CFRP. The area of the girder available for repair was limited to the bottom soffit for near surface mounted CFRP and bonded post tensioned CFRP; however, the externally bonded CFRP was applied on the bulb as well as the soffit. The range of the repairs examined were approximately 25%, 50%, and 75%, and 100% of the maximum practical amount of CFRP which could be applied based on the girder geometry, ACI guidelines, and manufacturers' recommendations. The geometry of the girder limited the amount of CFRP which could be applied, so the repairs could only completely restore the ultimate girder capacity when very few strands were damaged and the maximum amount of CFRP was used. However, the CFRP techniques were shown effective at restoring some of the lost capacity and thus are an option if only a portion of the lost capacity must be restored. The study also showed that, in some cases, repairs are completely ineffective and the girder capacity is not increased beyond the damaged state. Using the results of this study, engineers can determine when repairing a girder will be effective and the extent to which the repair restores lost capacity.
Book Synopsis Evaluation and Repair Procedures for Precast/prestressed Concrete Girders with Longitudinal Cracking in the Web by : Maher K. Tadros
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.
Book Synopsis Structural Evaluation of Impact Damaged Prestressed Concrete I Girders Repaired with Fiber Reinforced Polymer (FRP) Materials by : Kimberly Lammert
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.
Book Synopsis Evaluation and repair of impact damaged prestressed concrete bridge girders by : Robert Steven Zobel
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:
Book Synopsis CFRP Repair of Impact-damaged Bridge Girders by : Homer Robert Hamilton
Download or read book CFRP Repair of Impact-damaged Bridge Girders written by Homer Robert Hamilton and published by . This book was released on 2005 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation and Repair of Impact Damaged Prestressed Concrete Bridge Girders by : Robert Steven Zobel
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:
Book Synopsis Flexural Behavior of Laterally Damaged Full-scale Bridge Girders Through the Use of Carbon Fiber Reinforced Polymers (cfrp) by : Nicholas James Alteri
Download or read book Flexural Behavior of Laterally Damaged Full-scale Bridge Girders Through the Use of Carbon Fiber Reinforced Polymers (cfrp) written by Nicholas James Alteri and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT The repair and strengthening of concrete bridge members with CFRP has become increasingly popular over recent years. However, significant research is still needed in order to develop more robust guidelines and specifications. The research project aims to assist with improving design prosedures for damaged concrete members with the use of CFRP. This document summarizes the analysis and testing of full-scale 40' foot long prestressed concrete (PSC) bridge girders exposed to simulated impact damage and repaired with carbon fiber reinforced polymers (CFRP) materials. A total of five AASHTO type II bridge girders fabricated in the 1960's were taken from an existing bridge, and tested at the Florida Department of Transportation FDOT structures lab in Tallahassee, Florida. The test specimens were tested under static loading to failure under 4-point bending. Different CFRP configurations were applied to each of the girders. Each of the test girders performed very well as each of them held a higher capacity than the control girder. The repaired girders 5, 6 and 7 surpassed the control girder's capacity by 10.88%, 15.9% and 11.39%. These results indicate that repairing laterally damaged prestressed concrete bridge girders with CFRP is an effective way to restore the girders flexural capacity.
Book Synopsis Repair Method for Prestressed Girder Bridges by : Kent A. Harries
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.
Book Synopsis The Repair of Laterally Damaged Concrete Bridge Girders Using Carbon Fiber Reinforcing Polymers (CFRP) by : Matthew Kent Graeff
Download or read book The Repair of Laterally Damaged Concrete Bridge Girders Using Carbon Fiber Reinforcing Polymers (CFRP) written by Matthew Kent Graeff and published by . This book was released on 2012 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Enhancement of Service Life of Prestressed Concrete Bridge Girders Using FRP Composites by : Muhammad Shafqat Ali
Download or read book Enhancement of Service Life of Prestressed Concrete Bridge Girders Using FRP Composites written by Muhammad Shafqat Ali and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "This research aims at enhancing the service life of the prestressed concrete bridge girders, using fiber-reinforced polymer (FRP) composite shell on the lower flange to impede the ingress of deleterious elements into the concrete. The FRP shell would help to retard the resulting deterioration reactions and achieve more durable bridges for a considerably increased service life. The behavior of prestressed concrete bridge girders with FRP shells on the tension flange was investigated experimentally.The flexural characteristics of FRP shell and concrete interface along with the effect of the steel reinforcement ratio were studied experimentally. This FRP shell was bonded around the lower part of the concrete beams, constructed with four different reinforcement ratios. The beam specimens with the FRP shell showed a significant enhancement in their strength, stiffness and energy absorption capacities, as compared with the associated control beams. The flexural behavior of cast-in-place prestressed concrete beams with FRP shell was studied to examine the contribution of the bonded FRP shell to the strength, stiffness, ductility and energy absorption capacity of prestressed concrete beam specimens, for five different levels of prestressing. The initial cracking, yield and ultimate strengths of the beam specimens with FRP shell were significantly higher than those of the associated control beam specimens. The FRP shell and the prestressing force enhanced the strength and stiffness of the beams. The long-term durability of the FRP shell to act as a barrier against ingress of aggressive elements, such as moisture and chlorides into the proposed FRP shell-concrete system, was examined experimentally in a preliminary manner. Detailed tests on concrete specimens reinforced externally with FRP shells subjected to accelerated moisture and salt solution at control temperatures were performed. In addition, scanning electron microscopy (SEM) was used to determine the effects caused by aging, with time, temperature and chloride injection pressure. The FRP shell, acting as a barrier, showed a significant resistance against chloride ingress by significantly slowing down the chlorides ingress rate and the total amount of chlorides. For a prestressed concrete girder with an FRP shell, the accumulated time for chloride penetration and reaching the level of prestressing steel strands was predicted to be more than 135 years. These results suggest that the FRP shell is quite effective in improving the durability characteristics of prestressed concrete girders and can significantly extend their service life. " --
