Author:
Publisher:
ISBN:
Category : Concrete beams
Languages : en
Pages : 4
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Book Description
The objective of this research was to determine the lap splice length of untensioned prestressing strand in field-cast ultrahigh performance concrete (UHPC).
Author: Benjamin A. Graybeal
Publisher:
ISBN:
Category : Concrete beams
Languages : en
Pages : 38
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Book Description
The development length of reinforcements embedded into ultra-high performance concrete (UHPC) can be significantly shorter than the lengths normally associated with conventional concrete. Shortening the development length of prestressing strand can allow for a redesign of some structural systems, including spliced girder and continuous-for-live-load bridges. Ultra-high performance concrete (UHPC), when used in field-cast connections between prefabricated bridge elements, can create robust connections which emulate monolithic components. This study investigated the development length of 0.5 and 0.6 inch (12.7 and 15.2 mm) diameter untensioned prestressing strands embedded in steel fiber and PVA fiber reinforced UHPC. The volumetric fiber content was 2 percent. A novel tension test method allowed for replication of the tension-tension stress state that would occur when two strands are lap spliced within a connection between two linear elements. The results suggest that, for the steel fiber reinforced UHPC, the 0.5 inch (12.7 mm) diameter strands can be fully developed within 20 inches (0.51 m) and the 0.6 inch (15.2 mm) diameter strands can be fully developed in approximately 24 inches (0.61 m). The 0.5 inch (12.7 mm) diameter strands can be fully developed in the PVA fiber reinforced UHPC in approximately 36 inches (0.91 m).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Edward R. Sturm
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 280
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Book Description
Author: Jason Cameron Dill
Publisher:
ISBN:
Category : High strength concrete
Languages : en
Pages : 650
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Book Description
Author: Shawn P. Gross
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 96
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Book Description
This study examines the transfer and development length of 15.2 mm (0.6 in.) diameter prestressing strand in high performance (high strength) concrete. Two 1067 mm (42.0 in.) deep rectangular beams, commonly called the Hoblitzell-Buckner beams, each with one row of 15.2 mm (0.6 in.) diameter strands at 51 mm (2 in.) spacing on center, were instrumented to measure the transfer and development length of the strands. Concrete strengths were 48.5 MPa (7040 psi) at transfer and 90.7 MPa (13,160 psi) at the time of development length testing. The strand surface condition was weathered or rusty. Transfer length was determined from the concrete strain profile at the level of the strands at transfer.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Ekkehard Fehling
Publisher: kassel university press GmbH
ISBN: 3899583760
Category : High strength concrete
Languages : en
Pages : 922
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Book Description
Author: American Association of State Highway and Transportation Officials
Publisher: AASHTO
ISBN: 1560514698
Category : Bridges
Languages : en
Pages : 38
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Book Description
Author: Ekkehard Fehling
Publisher: John Wiley & Sons
ISBN: 3433030871
Category : Technology & Engineering
Languages : en
Pages : 198
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Book Description
Selected chapters from the German concrete yearbook are now being published in the new English "Beton-Kalender Series" for the benefit of an international audience. Since it was founded in 1906, the Ernst & Sohn "Beton-Kalender" has been supporting developments in reinforced and prestressed concrete. The aim was to publish a yearbook to reflect progress in "ferro-concrete" structures until - as the book's first editor, Fritz von Emperger (1862-1942), expressed it - the "tempestuous development" in this form of construction came to an end. However, the "Beton-Kalender" quickly became the chosen work of reference for civil and structural engineers, and apart from the years 1945-1950 has been published annually ever since. Ultra high performance concrete (UHPC) is a milestone in concrete technology and application. It permits the construction of both more slender and more durable concrete structures with a prolonged service life and thus improved sustainability. This book is a comprehensive overview of UHPC - from the principles behind its production and its mechanical properties to design and detailing aspects. The focus is on the material behaviour of steel fibre-reinforced UHPC. Numerical modelling and detailing of the connections with reinforced concrete elements are featured as well. Numerous examples worldwide - bridges, columns, facades and roofs - are the basis for additional explanations about the benefits of UHPC and how it helps to realise several architectural requirements. The authors are extensively involved in the testing, design, construction and monitoring of UHPC structures. What they provide here is therefore a unique synopsis of the state of the art with a view to practical applications.
