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423.5R-99
Partially prestressed concrete construction uses prestressed, or a combina-tionof prestressed and nonprestressed, reinforcement. Partially prestressedconcrete falls between the limiting cases of conventionally reinforced concrete and fully prestressed concrete, which allows no flexural tension under service loads. When flexural tensile stresses and cracking are llowed under service loads, the prestressed members have historically been called partially prestressed. This report is presented as an overview of the current state of the art for partial prestressing of concrete structures. Research findings and design applications are presented. Specific topics discussed include the history of partial prestressing, behavior of partially prestressed concrete members under static loads, time-dependent effects, fatigue, and the effects of cyclic loadings. Contents: 1.1-Historical perspective 1.2-Definition 1.3-Design of philosophy of partial prestressing 1.4-Advantages and disadvantages of partial prestressing 1.5-Partial prestressing and reinforcement indexes 1.6-Report objective
2.1-Behavior 2.2-Methods of analysis 2.3-Cracking 2.4-Deflection 2.5-Shear and torsion
3.1-Prestress losses 3.2-Cracking 3.3-Deflections 3.4-Corrosion
4.1-Background 4.2-Material fatigue strength 4.3-Fatigue in partially prestressed beams 4.4-Prediction of fatigue strength 4.5-Serviceability aspects 4.6-Summary of serviceability
5.1-Introduction 5.2-Design philosophy for seismic loadings 5.3-Ductility 5.4-Energy dissipation 5.5-Dynamic analyses 5.6-Connections 5.7-Summary
6.1-Early applications 6.2-Pretensioned concrete components 6.3-Post-tensioned building construction 6.4-Bridges 6.5-Other applications
7.1-Referenced standards and reports 7.2-Cited References
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ACI
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