NCHRP Project 12-56, Application of Load and Resistance Factor Design Specifications to High-Strength Structural Concrete: Shear Provisions
The load and resistance factor design (LRFD) specifications in the current AASHTO "LRFD Bridge Design Specifications" limit the compressive cylinder strength to 10 ksi in relationships for calculating shear design strength, whereas concrete compressive strengths close to twice this level are commercially available in some parts of the United States. To overcome this limitation, allowing the same-size structural sections to span longer distances or carry higher loads, NCHRP has funded Project 12-56, Application of the LRFD Bridge Design Specifications to High-Strength Structural Concrete: Shear Provisions. In the Experimental component of this project, 12 prestressed concrete bridge girders 52 ft long and 6 ft deep are being subjected to a uniformly distributed load until failure in shear. The primary variables in this study are concrete strength (ranging from 10 to 18 ksi), the maximum shear design stress (700 to 2,500 psi), strand anchorage details (straight, unbonded, and draped), and end reinforcement detailing (bar size, spacing, level of confinement). Key observations from experiments on the first six girders are presented.
- Record URL:
- Record URL:
-
Availability:
- Find a library where document is available. Order URL: http://www.trb.org/Main/Public/Blurbs/156132.aspx
-
Authors:
- Kuchma, Daniel A
- Kim, Kang Su
- Hawkins, Neil M
-
Conference:
- 6th International Bridge Engineering Conference: Reliability, Security, and Sustainability in Bridge Engineering
- Location: Boston MA, United States
- Date: 2005-7-17 to 2005-7-20
- Publication Date: 2005
Language
- English
Media Info
- Media Type: Digital/other
- Features: Figures; Photos; References; Tables;
- Pagination: pp 87-97
- Monograph Title: 6th International Bridge Engineering Conference, July 17-20, 2005
-
Serial:
- Transportation Research Record: Journal of the Transportation Research Board
- Issue Number: CD 11-S
- Publisher: Transportation Research Board
- ISSN: 0361-1981
Subject/Index Terms
- TRT Terms: Bridge design; Compressive strength; Concrete; Girders; High strength concrete; Load and resistance factor design; Load tests; Prestressed concrete; Shear strength; Shear stress; Specifications
- Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;
Filing Info
- Accession Number: 01002481
- Record Type: Publication
- ISBN: 0309093813
- Files: TRIS, TRB
- Created Date: Jul 28 2005 5:30PM