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Design of deep beams in reinforced concrete

Series/doc. No Guide Guide G 2
Year 1977
Abstract The Guide provides simple rules for designing reinforced concrete beams of span/depth ratio below 2 for single spans or 2.5 for multiple spans. Supplementary rules deal with cases where load capacity of the beam may be affected by elastic instability, where loads are concentrated, or where holes in the beam may affect performance. The derivation of the rules is given. Appendices give typical stress distribution in deep beams, design examples, buckling strength, shear strength of top-loaded deep beams, and an estimate of deflections in deep beams.
ISBN 9780860170815
Subject(s) Building systems/frame
Building structure
Concrete building systems/frame
Supplement Civil & Structural. To subscribe to The Construction Information Service please telephone Customer Care on +44 1344 328300
Publisher CIRIA
Publisher History CIRIA was formerly known as the Construction Industry Research and Information Association. They are a member-based research and information organisation who publish reports and technical papers covering building and civil engineering as well as transport and utilities infrastructure.
Table Of Contents
Summary 8
1 Introduction 9
1.1 General 9
1.2 Design principles 9
1.3 Scope 9
1.4 Limitations 9
1.5 Multi-purpose deep beams 9
1.6 Geometry and behaviour of deep beams 11
1.7 Design rules - general considerations 12
2 Simple rules of the analysis of deep beams 12
2.1 General 12
2.2 Geometry 13
2.3 Computation of forces 14
2.4 Strength: ultimate limit state 17
2.5 Holes through deep beam 23
2.6 Serviceability limit state 27
3 Supplementary rules for the analysis of deep beams 29
3.1 General 29
3.2 Geometry 29
3.3 Computation of forces 30
3.4 Strength: ultimate limit state 30
3.5 Holes through deep beams 38
3.6 Serviceability limit state 41
4 Behaviour of deep beams: an explanation of the rules 41
4.1 Elastic analysis 41
4.2 Elastic instability 43
4.3 Ultimate load behaviour 43
4.4 Flexural failure 43
4.5 Shear failure 44
4.6 Shear capacity: top-loaded beams 45
4.7 Shear capacity: bottom and indirectly loaded and indirectly supported deep beams 48
4.8 Shear capacity: upper limits 48
4.9 Shear capacity: load combination 49
4.10 Bearing failure 49
4.11 Bursting tensions produced under concentrated loads 50
4.12 Holes 51
4.13 Deformation and deflection 52
4.14 Settlement of foundations 52
4.15 Reinforcement 52
5 References 52
Appendices 55
A. Typical stress distribution in deep beams 55
B. Examples of deep beam design 75
C. Buckling strength of deep beams 109
D. Shear strength of reinforced, top-loaded deep beams 120
E. Estimate of deflections in deep beams 122
List of illustrations 128
List of tables 134
Symbols, terms and units of measurement 134


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