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PRESTRESSED CONCRETE
Foreword
Preface
Acknowledgements
Notations
1 introduction
Development of prestressed concrete
Advantages of prestressed concrete
Classification of types prestressing
Tendons and cables
Concepts of prestressing
References
2 Materials
Introduction
Concrete
High tensile steel
Corrosion of prestressing steel
Modern materials
References
3 prestressing systems and devices
General
Anchorage by embedment
Anchorage by external components
Couples
Non-conventional prestressing
References
4 Analysis for flexure (prestressed concrete elements)
General
Behavior of prestressed concrete
Elements in flexure
Basic assumption
Notations
General concept of stresses
Prestressing force transferred by pretensioning system
Prestressing force transferred by
Post tensioning system
Resultant compression line
Load balancing concept
References
5 Losses in prestress
Introduction
Immediate losses
References
6 Ultimate strength in flexure
General
Failure of beam by fracture of steel
Failure of under reinforced beams
Failure of over reinforced beams
Balanced beam
Design failure loads and moments
Evaluation of failure load/failure moment
Code provisions
References
7 Philosophy of design
Introduction
Concepts of limit states and partial safety factors
Design loads and stresses
Limit state of collapse
Limit state of serviceability
References
8 design for flexure
Introduction
Flexural design using allowable
Stresses at service load
Stress range approach
Lins approach
Magnel’s approach
References
9 Shear and torsional behavior (analysis and design)
Concept of shear
Mechanism of shear resistance in concrete beams
Design for shear in prestressed concrete beams
Shear in flanged beams
Concept of torsion
Behavior of structural elements under torsion
Failure of concrete elements under torsion
IS 1343-1980 code provisions
British code provision BS 8110-1985
American code specification ACI-318-1998
References
10 Transmission and anchorage zone
(analysis and design)
General
Pretensioned prestressed concrete elements
Post tensioned prestressed concrete elements
Indian standards code provisions
FIP recommendations 1984 specifications
BS 8110-1985 specifications
Detailing of reinforcement in general
References
11 Composite construction
General
Need for composite construction
Types of composite construction
Flexural stresses
Longitudinal shear transfer
Transverse shear
Creep and shrinkage effects
In composite construction
Stage prestressing
Additional design considerations
References
12 Statically indeterminate structures
(Analysis and design)
General
Analysis of prestressed indeterminate structures
Continuous beams
Linear transformations and cable profiles
Comparison for choice for best profile
Effect of time dependent deformation on
Indeterminate prestressed concrete structures
References
13 Cylindrical structures in prestressed concrete-pipes
and tanks (analysis and design)
General
Prestressed concrete pipes
Types of prestressed concrete pipes
Unique properties of non-cylinder
Prestressed pipes
Advantages of prestressed concrete pipes
Loads on pipes
Design of prestressed concrete pipes
Design of prestressed concrete
Non-cylinder pipes
Prestressed concrete water tanks
Choice of shape of tanks
Structural behavior of cylindrical tanks
Design effects of prestressing
Design for flexure in vertical plane
Influence line for moments in vertical plane
Design procedure
Design examples
Construction problems
References
14 Partial prestressing (principles, analysis and design concepts)
General
Case for partial prestressing
Partial prestressing and the codes of practice
Definitions for partial prestressing
Analysis
Design
Cracks and crack width
References
15 Other structures
General
Flat slabs
Two sides supported slabs
Skew slabs
Folded plates
Cylindrical shell structures
Doubly curved shell structures
References
Subject index