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Book Anchorage Zone in Post tensioned Concrete Bridge I girders

Download or read book Anchorage Zone in Post tensioned Concrete Bridge I girders written by Haitham H. Hamad and published by . This book was released on 1996 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Anchorage Zone Reinforcement for Post tensioned Concrete Girders

Download or read book Anchorage Zone Reinforcement for Post tensioned Concrete Girders written by John Edward Breen and published by Transportation Research Board. This book was released on 1994 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Anchorage zone design

Download or read book Anchorage zone design written by Gregor P. Wollmann and published by . This book was released on 2000 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides guidance on comprehensive treatment of tendon anchorage zone requirements and analysis methods. Special emphasis on practical applications of strut and tie design approach, which is recommended by AASHTO and ACI. Step by step design analyses for a number of typical anchorage zone conditions.

Book Anchorage Zone Design for Pretensioned Precast Bulb T Bridge Girders in Virginia

Download or read book Anchorage Zone Design for Pretensioned Precast Bulb T Bridge Girders in Virginia written by Eric Daniel Crispino and published by . This book was released on 2009 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Precast/prestressed concrete girders are commonly used in bridge construction in the United States. The application and diffusion of the prestress force in a pretensioned girder cause a vertical tension force to develop near the end of the beam. Field surveys of the beam ends of pretensioned bridge girders indicate that many of the precast bulb-T (PCBT) beams used in Virginia develop cracks within the anchorage zone region. The lengths and widths of these cracks range from acceptable to poor and in need of repair. Field observations also indicate deeper cross sections, very heavily prestressed sections, and girders with lightweight concrete tend to be most susceptible to crack formation. This research examined a new strut-and-tie based design approach to the anchorage zone design of the PCBT bridge girders used in Virginia. Case study girders surveyed during site visits were used to illustrate the nature of the problem and support the calibration of the strut-and-tie-based model. A parametric study was conducted using this proposed design model, and the results of this study were consolidated into anchorage zone design tables. The results of the parametric study were compared to the results obtained using existing anchorage zone design models, international bridge codes, and standard anchorage zone details used by other states. A set of new standard details was developed for the PCBT girders that incorporates elements of the new design approach and is compatible with the anchorage zone design aids. A 65-ft PCBT-53 girder was fabricated offsite and tested at the Virginia Tech Structures Lab to verify the new strut-and-tie-based design model. This girder contained anchorage zone details designed with the new model. The new anchorage zone details were successful at controlling the development of anchorage zone cracks. The new design approach is recommended for implementation by the Virginia Department of Transportation.

Book Flocculation Treatment Best Management Practices for Construction Water Discharges

Download or read book Flocculation Treatment Best Management Practices for Construction Water Discharges written by Brian Thomas Mathys and published by . This book was released on 2014 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Minnesota Department of Transportation has typically used epoxy-coated, straight-legged stirrups anchored in the tension zone as transverse reinforcement in prestressed concrete bridge girders. This configuration is readily placed after stressing the prestressing strands. American Concrete Institute (ACI) and American Association of State Highway and Transportation Officials (AASHTO) specifications require stirrups with bent legs that encompass the longitudinal reinforcement to properly anchor the stirrups. Such a configuration is specified to provide mechanical anchorage to the stirrup, ensuring that it will be able to develop its yield strength with a short anchorage length to resist shear within the web of the girder. AASHTO specifications for anchoring transverse reinforcement are the same for reinforced and prestressed concrete; however, in the case of prestressed concrete bridge girders, there are a number of differences that serve to enhance the anchorage of the transverse reinforcement, thereby enabling the straight bar detail. These include the precompression in the bottom flange of the girder in regions of web-shear cracking. In addition, the stirrup legs are usually embedded within a bottom flange that contains longitudinal strands outside the stirrups. The increased concrete cover over the stirrups provided by the bottom flange and the resistance to vertical splitting cracks along the legs of the stirrups provided by the longitudinal prestressing reinforcement outside the stirrups help to enhance the straight-legged anchorage in both regions of web-shear cracking and flexure-shear cracking. A two-phase experimental program was conducted to investigate the anchorage of straight-legged, epoxy-coated stirrups, which included bar pullout tests performed on 13 subassemblage specimens that represented the bottom flanges of prestressed concrete girders, to determine the effectiveness of straight-legged stirrup anchorage in developing yield strains. Additionally, four girder ends were cast with straight-legged stirrup anchorage details and tested in flexure-shear and web-shear. The straight leg stirrup anchorage detail was determined to be acceptable for Minnesota Department of Transportation (MnDOT) M and MN shaped girders as nominal shear capacities were exceeded and yield strains were measured in the stirrups prior to failure during each of the tests.

Book Anchorage Zone Reinforcement for Post tensioned Concrete Girders

Download or read book Anchorage Zone Reinforcement for Post tensioned Concrete Girders written by John Edward Breen and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Behavior and Design of Post tensioned Girder Anchorage Zones

Download or read book Behavior and Design of Post tensioned Girder Anchorage Zones written by William C. Stone and published by . This book was released on 1984 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: