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Author :
Publisher :
ISBN 13 :
Total Pages : 58 pages
Book Rating : 4.3/5 (555 download)
Download or read book Field Verification of Bridge Deck Post-tensioning written by and published by . This book was released on 1987 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Julio A. Ramirez
Publisher :
ISBN 13 : 9781622600489
Total Pages : pages
Book Rating : 4.6/5 (4 download)
Download or read book Experimental Evaluation and Implementation of Post-Tensioning in Concrete Bridge Decks written by Julio A. Ramirez and published by . This book was released on 2010-11-15 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Terry J. Wipf
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (317 download)
Download or read book Precast Concrete Elements for Accelerated Bridge Construction: Laboratory testing, field testing, and evaluation of a precast concrete bridge: Black Hawk County written by Terry J. Wipf and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In July 2006, construction began on an accelerated bridge project in Boone County, Iowa that was composed of precast substructure elements and an innovative, precast deck panel system. The superstructure system consisted of full-depth deck panels that were prestressed in the transverse direction, and after installation on the prestressed concrete girders, post-tensioned in the longitudinal direction. Prior to construction, laboratory tests were completed on the precast abutment and pier cap elements. The substructure testing was to determine the punching shear strength of the elements. Post-tensioning testing and verification of the precast deck system was performed in the field. The forces in the tendons provided by the contractor were verified and losses due to the post-tensioning operation were measured. The stress (strain) distribution in the deck panels due to the post-tensioning was also measured and analyzed. The entire construction process for this bridge system was documented. Representatives from the Boone County Engineers Office, the prime contractor, precast fabricator, and researchers from Iowa State University provided feedback and suggestions for improving the constructibility of this design.
Author : Terry J. Wipf
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (317 download)
Download or read book Precast Concrete Elements for Accelerated Bridge Construction: Laboratory testing, field testing, and evaluation of a precast concrete bridge: Madison County bridge written by Terry J. Wipf and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In July 2006, construction began on an accelerated bridge project in Boone County, Iowa that was composed of precast substructure elements and an innovative, precast deck panel system. The superstructure system consisted of full-depth deck panels that were prestressed in the transverse direction, and after installation on the prestressed concrete girders, post-tensioned in the longitudinal direction. Prior to construction, laboratory tests were completed on the precast abutment and pier cap elements. The substructure testing was to determine the punching shear strength of the elements. Post-tensioning testing and verification of the precast deck system was performed in the field. The forces in the tendons provided by the contractor were verified and losses due to the post-tensioning operation were measured. The stress (strain) distribution in the deck panels due to the post-tensioning was also measured and analyzed. The entire construction process for this bridge system was documented. Representatives from the Boone County Engineers Office, the prime contractor, precast fabricator, and researchers from Iowa State University provided feedback and suggestions for improving the constructibility of this design.
Author :
Publisher : Transportation Research Board
ISBN 13 : 0309129338
Total Pages : 96 pages
Book Rating : 4.3/5 (91 download)
Download or read book Nondestructive Testing to Identify Concrete Bridge Deck Deterioration written by and published by Transportation Research Board. This book was released on 2013 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: " TRB's second Strategic Highway Research Program (SHRP 2) Report S2-R06A-RR-1: Nondestructive Testing to Identify Concrete Bridge Deck Deterioration identifies nondestructive testing technologies for detecting and characterizing common forms of deterioration in concrete bridge decks.The report also documents the validation of promising technologies, and grades and ranks the technologies based on results of the validations.The main product of this project will be an electronic repository for practitioners, known as the NDToolbox, which will provide information regarding recommended technologies for the detection of a particular deterioration. " -- publisher's description.
Author : Terry J. Wipf
Publisher :
ISBN 13 :
Total Pages : 88 pages
Book Rating : 4.:/5 (1 download)
Download or read book Evaluation of Post-tension Strengthened Steel Girder Bridge Using FRP Bars written by Terry J. Wipf and published by . This book was released on 2003 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many state, county, and local agencies are faced with deteriorating bridge infrastructure composed of a large percentage of relatively short to medium span bridges. In many cases, these older structures are rolled or welded longitudinal steel stringers acting compositely with a reinforced concrete deck. Most of these bridges, although still in service, need some level of strengthening due to increases in legal live loads or loss of capacity due to deterioration. Although these bridges are overstressed in most instances, they do not warrant replacement; thus, structurally efficient but cost-effective means of strengthening needs to be employed. In the past, the use of bolted steel cover plates or angles was a common retrofit option for strengthening such bridges. However, the time and labor involved to attach such a strengthening system can sometimes be prohibitive. This project was funded through the Federal Highway Administration's Innovative Bridge Research and Construction program. The goal is to retrofit an existing structurally deficient, three-span continuous steel stringer bridge using an innovative technique that involves the application of post-tensioning forces; the post-tensioning forces were applied using fiber reinforced polymer post-tensioning bars. When compared to other strengthening methods, the use of carbon fiber reinforced polymer composite materials is very appealing in that they are highly resistant to corrosion, have a low weight, and have a high tensile strength. Before the post-tensioning system was installed, a diagnostic load test was conducted on the subject bridge to establish a baseline behavior of the unstrengthened bridge. During the process of installing the post-tensioning hardware and stressing the system, both the bridge and the post-tensioning system were monitored. The installation of the hardware was followed by a follow-up diagnostic load test to assess the effectiveness of the post-tensioning strengthening system. Additional load tests were performed over a period of two years to identify any changes in the strengthening system with time. Laboratory testing of several typical carbon fiber reinforced polymer bar specimens was also conducted to more thoroughly understand their behavior. This report documents the design, installation, and field testing of the strengthening system and bridge.
Author : Raymond E. Davis
Publisher :
ISBN 13 :
Total Pages : 414 pages
Book Rating : 4.:/5 (318 download)
Download or read book Localized Stresses in a Post-tensioned Steel Girder Web-field Verification written by Raymond E. Davis and published by . This book was released on 1987 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Post-Tensioning Institute
Publisher :
ISBN 13 : 9781931085588
Total Pages : 0 pages
Book Rating : 4.0/5 (855 download)
Download or read book Post-tensioning Manual written by Post-Tensioning Institute and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : K. F. Dunker
Publisher :
ISBN 13 :
Total Pages : 160 pages
Book Rating : 4.:/5 (1 download)
Download or read book Strengthening of Existing Single Span Steel Beam and Concrete Deck Bridges written by K. F. Dunker and published by . This book was released on 1985 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: The unifying objective of Phases I and II of this study was to determine the feasibility of the post-tensioning strengthening method and to implement the technique on two composite bridges in Iowa. Following completion of these two phases, Phase III was undertaken and is documented in this report. The basic objectives of Phase III were further monitoring bridge behavior (both during and after post-tensioning) and developing a practical design methodology for designing the strengthening system under investigation. Specific objectives were: to develop strain and force transducers to facilitate the collection of field data; to investigate further the existence and effects of the end restraint on the post-tensioning process; to determine the amount of post-tensioning force loss that occurred during the time between the initial testing and the retesting of the existing bridges; to determine the significance of any temporary temperature-induced post-tensioning force change; and to develop a simplified design methodology that would incorporate various variables such as span length, angle-of-skew, beam spacing, and concrete strength. Experimental field results obtained during Phases II and III were compared to the theoretical results and to each other. Conclusions from this research are as follows: (1) Strengthening single-span composite bridges by post-tensioning is a viable, economical strengthening technique. (2) Behavior of both bridges was similar to the behavior observed from the bridges during field tests conducted under Phase II. (3) The strain transducers were very accurate at measuring mid-span strain. (4) The force transducers gave excellent results under laboratory conditions, but were found to be less effective when used in actual bridge tests. (5) Loss of post-tensioning force due to temperature effects in any particular steel beam post-tensioning tendon system were found to be small. (6) Loss of post-tensioning force over a two-year period was minimal. (7) Significant end restraint was measured in both bridges, caused primarily by reinforcing steel being continuous from the deck into the abutments. This end restraint reduced the effectiveness of the post-tensioning but also reduced midspan strains due to truck loadings. (8) The SAP IV finite element model is capable of accurately modeling the behavior of a post-tensioned bridge, if guardrails and end restraints are included in the model. (9) Post-tensioning distribution should be separated into distributions for the axial force and moment components of an eccentric post-tensioning force. (10) Skews of 45 deg or less have a minor influence on post-tensioning distribution. (11) For typical Iowa three-beam and four-beam composite bridges, simple regression-derived formulas for force and moment fractions can be used to estimate post-tensioning distribution at midspan. At other locations, a simple linear interpolation gives approximately correct results. (12) A simple analytical model can accurately estimate the flexural strength of an isolated post-tensioned composite beam.
Author :
Publisher :
ISBN 13 :
Total Pages : 185 pages
Book Rating : 4.:/5 (79 download)
Download or read book Strengthening of Existing Single Span Steel Beam and Concrete Deck Bridges written by and published by . This book was released on 1983 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 182 pages
Book Rating : 4.:/5 (1 download)
Download or read book Strengthening of an Existing Continuous-span, Steel-beam, Concrete-deck Bridge by Post-tensioning written by and published by . This book was released on 1990 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: The need to upgrade a large number of understrength and obsolete bridges in the U.S. has been well documented in the literature. Through several Iowa DOT projects, the concept of strengthening simple-span bridges by post-tensioning has been developed. The purpose of the project described in this report was to investigate the use of post-tensioning for strengthening continuous composite bridges. In a previous, successfully completed investigation, the feasibility of strengthening continuous, composite bridges by post-tensioning was demonstrated on a laboratory 1/3-scale-model bridge (3 spans: 41 ft 11 in. x 8 ft 8 in.). This project can thus be considered the implementation phase. The bridge selected for strengthening was in Pocahontas County near Fonda, Iowa, on County Road N28. With finite element analysis, a post-tensioning system was developed that required post-tensioning of the positive moment regions of both the interior and exterior beams. During the summer of 1988, the strengthening system was installed along with instrumentation to determine the bridge's response and behavior. Before and after post-tensioning, the bridge was subjected to truck loading (1 or 2 trucks at various predetermined critical locations) to determine the effectiveness of the strengthening system. The bridge, with the strengthening system in place, was inspected approximately every three months to determine any changes in its appearance or behavior. In 1989, approximately one year after the initial strengthening, the bridge was retested to identify any changes in its behavior. Post-tensioning forces were removed to reveal any losses over the one-year period. Post-tensioning was reapplied to the bridge, and the bridge was tested using the same loading program used in 1988. Except for at a few locations, stresses were reduced in the bridge the desired amount. At a few locations flexural stresses in the steel beams are still above 18 ksi, the allowable inventory stress for A7 steel. Although maximum stresses are above the inventory stress by about 2 ksi, they are about 5 ksi below the allowable operating stress; therefore, the bridge no longer needs to be load-posted.
Author : Raymond E. Davis
Publisher :
ISBN 13 :
Total Pages : 152 pages
Book Rating : 4.:/5 (318 download)
Download or read book Localized Stresses in a Post-tensioned Steel Girder Web-field Verifiction written by Raymond E. Davis and published by . This book was released on 1987 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James E. Richardson
Publisher :
ISBN 13 :
Total Pages : 180 pages
Book Rating : 4.:/5 (318 download)
Download or read book Field-measured Post-tension Prestress Loss in Stress-relieved Strands written by James E. Richardson and published by . This book was released on 1984 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kandi Rebecca Wieberg
Publisher :
ISBN 13 :
Total Pages : 292 pages
Book Rating : 4.:/5 (692 download)
Download or read book Field Investigation of Spalling in Bridge Decks with Partial-depth Precast Concrete Panel Systems Using Non-destructive Testing written by Kandi Rebecca Wieberg and published by . This book was released on 2010 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This study involved the investigation of the causes of spalling observed in several partial-depth precast prestressed bridge decks in the state of Missouri. Recently it has been observed that several bridges in Missouri with this type of construction have experienced spalling of concrete at the edges of the panels revealing an extreme condition of corrosion in the prestressing tendons, some to the point of rupture. Ground penetrating radar (GPR), which has been shown to be successful in bridge deck evaluation, was used to determine the relative condition of the prestressing tendons as well as the relative condition of the concrete throughout the deck in order to identify areas of cracking and corrosion. Particular techniques were used in an attempt to identify areas of delamination at the interface between the precast panels and cast-in-place topping slab, namely the acquisition of data from both the top and bottom deck surfaces as well as specialized data interpretation techniques. Core control and visual inspection were utilized to interpret and validate the GPR data. Half-cell, resistivity and rebound hammer testing was performed on bridge deck panels to determine the corrosion levels of the prestressing strands and material properties of the panels. Findings indicate that spalling in the PPC panels is the result of the penetration of water and chlorides through the reflective cracking in the CIP topping, to the interface between the CIP topping and the PPC panels, then through the PPC panels to the prestressing tendons located near the panel joints. Increased crack control in the CIP topping delays the onset of spalling at the panel joints. Most deterioration is occurring near the area of reflective cracking in the CIP topping and not in the area of concrete over the middle of the panels. Some delamination is occurring at the CIP topping and panel interface"--Abstract, leaf iii.
Author :
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.3/5 (555 download)
Download or read book Awards to Academic Institutions by the Department of Transportation written by and published by . This book was released on 1986 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : G. K. Megerian
Publisher :
ISBN 13 :
Total Pages : 46 pages
Book Rating : 4.3/5 (91 download)
Download or read book U.S. Department of Transportation Awards to Academic Institutions in Fiscal Year 1986 written by G. K. Megerian and published by . This book was released on 1987 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : United States. Forest Service
Publisher :
ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (3 download)
Download or read book Field Notes written by United States. Forest Service and published by . This book was released on 1976 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
