Serviceability failures of concrete structures involving excessive cracking or deflection are relatively common, even in structures that comply with code requirements. This is often as a result of a failure to adequately account for the time-dependent deformations of concrete in the design of the structure. The serviceability provisions embodied in codes of practice are relatively crude and, in some situations, unreliable and do not adequately model the in-service behaviour of structures. In particular, they fail to adequately account for the effects of creep and shrinkage of the concrete. Design for serviceability is complicated by the non-linear and inelastic behaviour of concrete at service loads.
Providing detailed information, this book helps engineers to rationally predict the time-varying deformation of concrete structures under typical in-service conditions. It gives analytical methods to help anticipate time-dependent cracking, the gradual change in tension stiffening with time, creep induced deformations and the load independent strains caused by shrinkage and temperature changes. The calculation procedures are illustrated with many worked examples.
A vital guide for practising engineers and advanced students of structural engineering on the design of concrete structures for serviceability and provides a penetrating insight into the time-dependent behaviour of reinforced and prestressed concrete structures.
Creep of Concrete
Shrinkage of Concrete
Time-Analysis – The Basic Problem
Design for Serviceability – Deflection and Crack Control
Design Objectives and Criteria
Design Criteria for Servicability
Maximum Span-to-Depth Ration Minimum Thickness
Deflection Control by Simplified Calculation
Uncracked Sections – Axial Loading
The Effective Modulus Method
The Principle of Superposition – Step-by-Step Method
The Age-Adjusted Effect Modulus Method (AEMM)
The Rate of Creep Method (RCM)
Comparison of Methods of Analysis
Uncracked Sections – Axial Force and Uniaxial Bending
Uncracked Sections – Axial Force and Biaxial Bending
Overview of Cross-Sectional Analysis
Short-Term Analysis of Reinforced or Prestressed Concrete Cross Sections
Long-Term Analysis of Reinforced or Prestressed Concrete Cross Sections Using the Age Adjusted Effective Modulus
Long-Term Analysis of Reinforced Prestressed Concrete Cross Section Using the Step-by-Step Procedure
Composite Steel-Concrete Cross Sections
Time-Dependent Analysis (AEMM)
Short- and Long-Term Analysis Using the Step-by-Step Method
Members and Structures
Deflection of Statically Determinate Beams
Statically Indeterminate Beams and Slabs
Two-Way Slab Systems
Slender Reinforced Concrete Columns
Stiffness Method and Finite Element Modelling
Overview of the Stiffness Method
Time Analysis Using AEMM
Time Analysis Using SSM
Time Analysis Using the Finite Element Method
Analysis of Cracked Members
Appendix: Analytical Formulations – Euler-Bernoulli Beam Model
Raymond Ian Gilbert is Professor of Civil Engineering at the University of New South Wales and currently holds an Australian Research Council Australian Professorial Fellowships. He has over 35 years experience in structural design and is a specialist in the analysis and design of reinforced and prestressed concrete structures.
Gianluca Ranzi is a Senior Lecturer of structural engineering at the University of Sydney, specialising in the analysis and design of concrete and composite steel-concrete structures.
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