A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Structural Behavior of High Strength Concrete Prestressed I-Beams. Volume 2. Final Report
The research results presented in the report include recommendations to allow the use of concrete strengths up to 6500 psi in the design of prestressed I-beams in the state of Indiana. No modifications of the current design equations to evaluate flexural and shear capacity are necessary. At simple supports of typical bridge structures the support centerline is usually between six and twelve inches from the end of the beam, and as a result, the transfer length of the strand extends into the shear span. Three tests conducted during the study, using this standard detailing, resulted in a premature strand anchorage failure as a web-shear crack penetrated into the transfer length of the strand. Although the specimens tested in the study had minimum amounts of shear reinforcement at the end regions, it is felt that the use of higher strength concrete in pretensioned beams requires an evaluation of the efficiency of the shear reinforcement in preventing this mode of failure. The effect of strand debonding in pretensioned beams also needs study. The current AASHTO and the Zia and Mostafa methods to predict transfer length of the strand were also evaluated. The results of the study showed that the Zia and Mostafa method predicted better the transfer length of the strand.
Structural Behavior of High Strength Concrete Prestressed I-Beams. Volume 2. Final Report
The research results presented in the report include recommendations to allow the use of concrete strengths up to 6500 psi in the design of prestressed I-beams in the state of Indiana. No modifications of the current design equations to evaluate flexural and shear capacity are necessary. At simple supports of typical bridge structures the support centerline is usually between six and twelve inches from the end of the beam, and as a result, the transfer length of the strand extends into the shear span. Three tests conducted during the study, using this standard detailing, resulted in a premature strand anchorage failure as a web-shear crack penetrated into the transfer length of the strand. Although the specimens tested in the study had minimum amounts of shear reinforcement at the end regions, it is felt that the use of higher strength concrete in pretensioned beams requires an evaluation of the efficiency of the shear reinforcement in preventing this mode of failure. The effect of strand debonding in pretensioned beams also needs study. The current AASHTO and the Zia and Mostafa methods to predict transfer length of the strand were also evaluated. The results of the study showed that the Zia and Mostafa method predicted better the transfer length of the strand.
Structural Behavior of High Strength Concrete Prestressed I-Beams. Volume 2. Final Report
M. K. Kaufman (author) / J. A. Ramirez (author)
1988
175 pages
Report
No indication
English
Highway Engineering , Construction Equipment, Materials, & Supplies , Structural Analyses , Construction Materials, Components, & Equipment , Prestressed concrete , Structural analysis , High strength concretes , I beams , Highway bridges , Shear properties , Beams(Supports) , Concrete construction , Concrete structures , Flexural strength , Deflection , Structural members , Reinforced concrete , Reinforcement(Structures) , Mathematical models , Ultimate strength , Indiana , Bridge design , Moments , Elastic analysis
Shear Strength and Behavior of High-Strength Concrete Prestressed Beams
| Online Contents | 2016
Shear Strength and Behavior of High-Strength Concrete Prestressed Beams
| Online Contents | 2016