Field and Laboratory Evaluation of Precast Concrete Bridges PDF Download
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Author:
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 190
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Book Description
The objective of this project was to determine the load capacity of the precast concrete deck bridge. The number of these structures requiring load postings and/or replacement can be significantly reduced if the deteriorated structures are found to have adequate load capacity or can be reliably evaluated.
Author:
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 190
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Book Description
The objective of this project was to determine the load capacity of the precast concrete deck bridge. The number of these structures requiring load postings and/or replacement can be significantly reduced if the deteriorated structures are found to have adequate load capacity or can be reliably evaluated.
Author: Jeremiah Scott Ingersoll
Publisher:
ISBN:
Category :
Languages : en
Pages : 276
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Book Description
The precast concrete deck bridge (PCDB) is a short span bridge that was commonly used on Iowa's secondary roads approximately forty years ago. Each PCDB span consists of eight to ten simply supported precast panels ranging in length from 19 ft to 36 ft. The panels resemble a steel channel in cross-section; the web is orientated horizontally and forms the roadway deck and the legs act as shallow beams. Bundled reinforcing bars in each leg act as the primary flexural reinforcement. Many of the approximately 600 PCDBs in Iowa show signs of significant deterioration. Typical deterioration consists of spalled concrete cover and corrosion of the bundled primary reinforcement. The objective of this research was to access the structural sufficiency of the deteriorated PCDBs through field and laboratory testing. Four deteriorated PCDBs were instrumented with strain gages to measure strains in both the concrete and reinforcing steel and transducers to measure vertical deflections. Response from loaded trucks was recorded and analyzed. Test results revealed that all measured strains and corresponding stresses were well within acceptable limits. Likewise, measured deflections were much less than the recommended AASHTO value. Load fractions, a measure of live load distribution, were calculated from the deflection data and compared for the four PCDBS. The two PCDBs tested without shear connectors were found to have load fractions considerably higher than those with shear connectors. Laboratory testing consisted of loading twelve deteriorated panels to failure in a four point bending arrangement. Although all panels exhibited significant deflection prior to failure, the experimental capacity of eleven panels exceeded their theoretical capacity. The experimental capacity of the twelfth panel, an extremely distressed panel, was only slightly below its theoretical capacity. Additional laboratory testing consisted of service tests performed on a four panel laboratory PCDB to determine the effect of various shear connection configurations on transverse load distribution. The laboratory PCDB was also utilized in an investigation into the behavior of an overloaded PCDB. Finally, a strengthening retrofit was applied to several panels and tested for its effectiveness.
Author:
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages :
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Book Description
Author: Brent Phares
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages :
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Book Description
The importance of rapid construction technologies has been recognized by the Federal Highway Administration (FHWA) and the Iowa DOT Office of Bridges and Structures. Recognizing this a two-lane single-span precast box girder bridge was constructed in 2007 over a stream. The bridge's precast elements included precast cap beams and precast box girders. Precast element fabrication and bridge construction were observed, two precast box girders were tested in the laboratory, and the completed bridge was field tested in 2007 and 2008.
Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages :
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Book Description
The importance of rapid construction technologies has been recognized by the Federal Highway Administration (FHWA) and the Iowa DOT Office of Bridges and Structures. Recognizing this a two-lane single-span precast box girder bridge was constructed in 2007 over a stream. The bridge's precast elements included precast cap beams and precast box girders. Precast element fabrication and bridge construction were observed, two precast box girders were tested in the laboratory, and the completed bridge was field tested in 2007 and 2008.
Author: Vernon William Wineland
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Richard J. Spring
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 73
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Book Description
Author: Eva Lantsoght
Publisher: CRC Press
ISBN: 0429555970
Category : Technology & Engineering
Languages : en
Pages : 347
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Book Description
Load Testing of Bridges, featuring contributions from almost fifty authors from around the world across two interrelated volumes, deals with the practical aspects, the scientific developments, and the international views on the topic of load testing of bridges. Volume 12, Load Testing of Bridges: Current practice and Diagnostic Load Testing, starts with a background to bridge load testing, including the historical perspectives and evolutions, and the current codes and guidelines that are governing in countries around the world. The second part of the book deals with preparation, execution, and post-processing of load tests on bridges. The third part focuses on diagnostic load testing of bridges. This work will be of interest to researchers and academics in the field of civil/structural engineering, practicing engineers and road authorities worldwide.
Author:
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 26
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Book Description
Various stress measurement techniques were evaluated in this study. The evaluation included a state-of-the-art review of existing techniques and analytical studies of these techniques. Based on analytical results, the flat-jack direct stress measurement technique was evaluated in laboratory and field tests. Based on these tests, a manual of instruction was written to describe the equipment and procedures required to obtain reliable direct stress measurement. This is the Executive Summary which summarizes the findings of this research project.
Author: Eva Lantsoght
Publisher: CRC Press
ISBN: 0429556489
Category : Technology & Engineering
Languages : en
Pages : 429
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Book Description
Load Testing of Bridges, featuring contributions from almost fifty authors from around the world across two interrelated volumes, deals with the practical aspects, the scientific developments, and the international views on the topic of load testing of bridges. Volume 13, Load Testing of Bridges: Proof Load Testing and the Future of Load Testing, focuses first on proof load testing of bridges. It discusses the specific aspects of proof load testing during the preparation, execution, and post-processing of such a test (Part 1). The second part covers the testing of buildings. The third part discusses novel ideas regarding measurement techniques used for load testing. Methods using non-contact sensors, such as photography- and video-based measurement techniques are discussed. The fourth part discusses load testing in the framework of reliability-based decision-making and in the framework of a bridge management program. The final part of the book summarizes the knowledge presented across the two volumes, as well as the remaining open questions for research, and provides practical recommendations for engineers carrying out load tests. This work will be of interest to researchers and academics in the field of civil/structural engineering, practicing engineers and road authorities worldwide.
