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
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
3 prestressing systems and devices
General
Anchorage by embedment
Anchorage by external components
Couples
Non-conventional prestressing
4 Analysis for flexure (prestressed concrete elements)
Behavior of prestressed concrete
Elements in flexure
Basic assumption
General concept of stresses
Prestressing force transferred by pretensioning system
Prestressing force transferred by
Post tensioning system
Resultant compression line
Load balancing concept
5 Losses in prestress
Immediate losses
6 Ultimate strength in flexure
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
7 Philosophy of design
Concepts of limit states and partial safety factors
Design loads and stresses
Limit state of collapse
Limit state of serviceability
8 design for flexure
Flexural design using allowable
Stresses at service load
Stress range approach
Lins approach
Magnel’s approach
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
10 Transmission and anchorage zone
(analysis and design)
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
11 Composite construction
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
12 Statically indeterminate structures
(Analysis and design)
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
13 Cylindrical structures in prestressed concrete-pipes
and tanks (analysis and design)
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
14 Partial prestressing (principles, analysis and design concepts)
Case for partial prestressing
Partial prestressing and the codes of practice
Definitions for partial prestressing
Analysis
Design
Cracks and crack width
15 Other structures
Flat slabs
Two sides supported slabs
Skew slabs
Folded plates
Cylindrical shell structures
Doubly curved shell structures
Subject index
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