TY - GEN
T1 - NCHRP project 12-56, application of load and resistance factor design specifications to high-strength structural concrete
T2 - Transportation Research Board - 6th International Bridge Engineering Conference: Reliability, Security, and Sustainability in Bridge Engineering
AU - Kuchma, Daniel A.
AU - Kim, Kang Su
AU - Hawkins, Neil M.
PY - 2005
Y1 - 2005
N2 - 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 over-come 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 rein-forcement detailing (bar size, spacing, level of confinement). Key observations from experiments on the first six girders are presented.
AB - 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 over-come 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 rein-forcement detailing (bar size, spacing, level of confinement). Key observations from experiments on the first six girders are presented.
UR - http://www.scopus.com/inward/record.url?scp=33645000834&partnerID=8YFLogxK
U2 - 10.3141/trr.11s.3t3qlrxm0h1r8262
DO - 10.3141/trr.11s.3t3qlrxm0h1r8262
M3 - Conference contribution
AN - SCOPUS:33645000834
SN - 0309093813
SN - 9780309093811
T3 - Transportation Research Board - 6th International Bridge Engineering Conference: Reliability, Security, and Sustainability in Bridge Engineering
SP - 87
EP - 97
BT - Transportation Research Board - 6th International Bridge Engineering Conference
PB - Transportation Research Board
Y2 - 17 July 2005 through 20 July 2005
ER -