Implementation of a Refined Shear Rating Methodology for Prestressed Concrete Girder Bridges PDF Download
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Author: Stephen J. Druschel
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 91
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Book Description
Lower than desirable shear ratings at the ends of prestressed concrete beams have been the topic of ongoing research between MnDOT and the University of Minnesota. A recent study by the University of Minnesota entitled Investigation of Shear Distribution Factors in Prestressed Concrete Girder Bridges (French et al., 2016) sought to increase the shear rating of a prestressed concrete beam via a refined live load distribution factor, considering the location-based load distribution of each axle along the span. The study also presented a screening tool to determine the likelihood that the refined methodology would improve the shear rating of a given prestressed concrete beam bridge. The research presented within this report implemented the refined shear rating methodology presented by French et al. (2016). MnDOT selected 522 bridges from its inventory noted as having shear rating deficiencies for potential re-evaluation as part of this research. After employing the screening tool, the initial selection was reduced to 127 applicable bridges, of which 50 were selected for re-evaluation. For the 50 bridges evaluated, the refined rating methodology was found to improve the shear ratings by an average of 16 percent. The screening tool also proved to be an effective means of determining the candidacy of a given bridge for re-evaluation.
Author: Stephen J. Druschel
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 91
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Book Description
Lower than desirable shear ratings at the ends of prestressed concrete beams have been the topic of ongoing research between MnDOT and the University of Minnesota. A recent study by the University of Minnesota entitled Investigation of Shear Distribution Factors in Prestressed Concrete Girder Bridges (French et al., 2016) sought to increase the shear rating of a prestressed concrete beam via a refined live load distribution factor, considering the location-based load distribution of each axle along the span. The study also presented a screening tool to determine the likelihood that the refined methodology would improve the shear rating of a given prestressed concrete beam bridge. The research presented within this report implemented the refined shear rating methodology presented by French et al. (2016). MnDOT selected 522 bridges from its inventory noted as having shear rating deficiencies for potential re-evaluation as part of this research. After employing the screening tool, the initial selection was reduced to 127 applicable bridges, of which 50 were selected for re-evaluation. For the 50 bridges evaluated, the refined rating methodology was found to improve the shear ratings by an average of 16 percent. The screening tool also proved to be an effective means of determining the candidacy of a given bridge for re-evaluation.
Author: Benjamin Z. Dymond
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 595
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Book Description
As shear requirements for prestressed concrete girders have changed, some structures designed using older specifications do not rate well with current methods. However, signs of shear distress have not been observed in these bridge girders and they are often deemed to be in good condition. The primary objective of this research program was to investigate the accuracy of existing shear distribution factors, which are used to estimate bridge system live load effects on individual girders, and provide recommendations on shear distribution to be used in Minnesota with four components: a full-scale laboratory bridge subjected to elastic and inelastic behavior, field testing of bridges, a numerical parametric study, and integration of results to develop a screening tool to determine which structures benefitted from refined analysis. Laboratory bridge inelastic testing indicated shear force redistribution after cracking and before ultimate failure. Use of elastic distribution factors is conservative for shear distribution at ultimate capacity. Elastic laboratory testing was used to validate the finite element modeling technique and study the behavior of a barrier and end diaphragm, which affected shear distribution; ignoring their effects was conservative. Parametric study results indicated that a ratio of longitudinal stiffness to transverse stiffness could be used as a screening tool. If the stiffness ratio was less than 1.5, shear demand from a simple, conservative grillage analysis may be more accurate than shear demand from AASHTO distribution factor methods. Grillage analysis shear demand results due to permit trucks may also be more accurate, regardless of the screening tool ratio.
Author: National Cooperative Highway Research Program
Publisher: Transportation Research Board
ISBN: 0309088445
Category : Concrete beams
Languages : en
Pages : 64
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Book Description
"TRB's National Cooperative Highway Research Program (NCHRP) Report 549: Simplified Shear Design of Structural Concrete Members examines development of practical equations for design of shear reinforcement in reinforced and prestressed concrete bridge girders. The report also includes recommended specifications, commentary, and examples illustrating application of the specifications. NCHRP Web-Only Document 78 contains extensive supporting information, including a database that can be used to compare the predictions from the recommended procedures to existing design procedures"--Publisher's description
Author: Maher K. Tadros
Publisher: Transportation Research Board
ISBN: 0309118352
Category : Technology & Engineering
Languages : en
Pages : 76
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Book Description
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: Hassan Hassan El-Hor
Publisher:
ISBN:
Category :
Languages : en
Pages : 474
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Book Description
Author: Ulises Barajas-Valdes
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 0
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Book Description
Author: Wai-Fah Chen
Publisher: CRC Press
ISBN: 1482255030
Category : Technology & Engineering
Languages : en
Pages : 3130
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Book Description
Over 140 experts, 14 countries, and 89 chapters are represented in the second edition of the Bridge Engineering Handbook. This extensive collection provides detailed information on bridge engineering, and thoroughly explains the concepts and practical applications surrounding the subject, and also highlights bridges from around the world.Published
Author: Wai-Fah Chen
Publisher: CRC Press
ISBN: 1439852294
Category : Technology & Engineering
Languages : en
Pages : 734
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Book Description
Over 140 experts, 14 countries, and 89 chapters are represented in the second edition of the Bridge Engineering Handbook. This extensive collection highlights bridge engineering specimens from around the world, contains detailed information on bridge engineering, and thoroughly explains the concepts and practical applications surrounding the subjec
Author: Alaa Ibrahim Chehab
Publisher:
ISBN:
Category : Civil engineering
Languages : en
Pages : 265
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Book Description
The main objectives of this study are to evaluate the adequacy of the current AASHTO methods for shear design of prestressed concrete (PC) bridge girders, determine the reliability of PC bridge girders in shear based on the current LRFD General Procedure, determine the most accurate and consistent method for predicting the shear capacity of AASHTO "I" shape PC bridge girders, and recalibrate the AASHTO LRFD code for shear as necessary. These objectives were achieved through lab testing of two full scale Type II girders, finite element modeling for more than 330 PC girders, parametric analysis, regression analysis, and structural reliability analysis for more than 200 PC bridge cases. As a result of this study, a regression equation and a modification to the current LRFD General Procedure were proposed, and rating factors based on MI live load traffic data were computed and discussed.
Author: Maher K. Tadros
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 76
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Book Description
