ISO 15673:2016

INTERNATIONAL ISO
STANDARD 15673
Second edition
2016-12-01
Guidelines for the simplified design
of structural reinforced concrete for
buildings
Lignes directrices pour la conception simplifiée du béton armé pour
les structures de bâtiments
Reference number
ISO 15673:2016(E)
©
ISO 2016

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ISO 15673:2016(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved

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ISO 15673:2016(E)

Contents Page
Foreword .ix
Introduction .x
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms .13
4.1 Symbols .13
4.2 Abbreviated terms .16
5 Design and construction procedure .17
5.1 Procedure .17
5.1.1 Step A .17
5.1.2 Step B .17
5.1.3 Step C .17
5.1.4 Step D .17
5.1.5 Step E .17
5.1.6 Step F.17
5.1.7 Step G .17
5.1.8 Step H .17
5.1.9 Step I .17
5.1.10 Step J .18
5.1.11 Step K .18
5.2 Design documentation .19
5.2.1 General.19
5.2.2 Calculation memoir .19
5.2.3 Geotechnical report .19
5.2.4 Structural drawings .19
5.2.5 Specifications .19
6 General guides .19
6.1 Limitations .19
6.1.1 Occupancy . .19
6.1.2 Maximum number of stories .20
6.1.3 Maximum area per floor .20
6.1.4 Maximum story height .20
6.1.5 Maximum span length .20
6.1.6 Maximum difference in span length .20
6.1.7 Minimum number of spans .21
6.1.8 Maximum cantilever span .21
6.1.9 Maximum slope for slabs, girders, beams and joists .21
6.1.10 Maximum slope of the terrain .21
6.1.11 Distance between centre of mass and centre of rigidity .21
6.2 Limit states .21
6.3 Ultimate limit state design format .21
6.3.1 General.21
6.3.2 Required factored strength .22
6.3.3 Design strength .22
6.4 Serviceability limit state design format .22
7 Specific guides .23
7.1 Structural systems and layout .23
7.1.1 Description of the components of the structure .23
7.1.2 General programme .24
7.1.3 Structural layout . . .25
7.1.4 Feasibility under the guidelines .28
© ISO 2016 – All rights reserved iii

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ISO 15673:2016(E)

8 Actions (loads) .29
8.1 General .29
8.1.1 Load factors and load combinations .29
8.1.2 Mass of materials .31
8.1.3 Dead loads .31
8.1.4 Live loads .32
8.1.5 Specified snow load .32
8.1.6 Specified wind forces .32
8.1.7 Specified earthquake forces .32
8.1.8 Seismic design base shear .39
9 General reinforced concrete requirements .40
9.1 General .40
9.2 Additional requirements .40
9.3 Materials for reinforced concrete .40
9.3.1 General.40
9.3.2 Cement .40
9.3.3 Aggregates .40
9.3.4 Water .40
9.3.5 Steel reinforcement .40
9.3.6 Admixtures . .41
9.3.7 Storage of materials .41
9.3.8 Minimum and maximum reinforcement bar diameter .41
9.3.9 Concrete mixture specification .42
9.3.10 Concrete cover to reinforcement .42
9.3.11 Minimum reinforcement bend diameter .43
9.3.12 Standard hook dimensions .44
9.3.13 Bar spacing and maximum aggregate size.45
9.3.14 Maximum nominal coarse aggregate size .45
9.3.15 Minimum clear spacing between parallel bars in a layer .46
9.3.16 Minimum clear spacing between parallel layers of reinforcement .46
9.3.17 Minimum clear spacing between longitudinal bars in columns .47
9.3.18 Clear spacing between parallel lap splices .48
9.3.19 Maximum flexural reinforcement spacing in solid slabs .48
9.3.20 Maximum shrinkage and temperature reinforcement spacing in solid slabs .48
9.3.21 Maximum reinforcement spacing in structural concrete walls .49
9.3.22 Special details per element type .49
9.4 Development length, lap splicing and anchorage of reinforcement.49
9.4.1 Development length .49
9.4.2 Lap splice dimensions .51
9.4.3 Minimum standard hook anchorage distance .51
9.5 Limits for longitudinal reinforcement .52
9.5.1 General.52
9.5.2 Solid slabs and footings.52
9.5.3 Girders, beams and joists .53
9.5.4 Columns .55
9.5.5 Structural concrete walls .55
9.6 Minimum amounts of transverse reinforcement .56
9.6.1 General.56
9.6.2 Slabs .56
9.6.3 Girders, beams and joists .56
9.6.4 Columns .56
9.6.5 Structural concrete walls .60
9.7 Strength of members subjected to bending moments .61
9.7.1 General.61
9.7.2 Factored bending moment at section .61
9.7.3 Minimum design bending moment strength .61
9.7.4 Design moment strength for rectangular sections with tension
reinforcement only . .61
iv © ISO 2016 – All rights reserved

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ISO 15673:2016(E)

9.7.5 Use of compression reinforcement in girders, beams, and joists .62
9.7.6 T-beam effect .64
9.8 Strength of members subjected to shear stresses .66
9.8.1 General.66
9.8.2 Factored shear .67
9.8.3 Design shear strength .67
9.8.4 Beam-action shear .67
9.8.5 Two-way action shear (punching shear) in solid slabs and footings .70
10 Floor systems .71
10.1 Types of floor systems .71
10.1.1 General.71
10.1.2 Slab-on-girder system .71
10.1.3 Description of the basic system .71
10.1.4 Joist systems .74
10.2 Criteria for the selection of the floor system.77
10.3 Guides for structural integrity .78
10.3.1 General.78
10.3.2 Perimeter girders in slab-and-girder and joist systems .78
10.3.3 Other beams and girders .78
10.3.4 Joists .78
10.4 One-way and two-way slabs and load path .78
10.4.1 General.78
10.4.2 One-way behaviour . .78
10.4.3 Two-way behaviour .79
10.4.4 Floor system load path .79
10.5 Minimum depth for elements of the floor system .79
10.5.1 General.79
10.5.2 Solid one-way slabs supported by girders, beams, joists, or structural walls .79
10.5.3 Girders, beams and one-way joists supporting the slab .80
10.5.4 Two-way slabs supported by girders, beams, or structural concrete walls.81
10.6 Initial trial dimensions for the floor system .82
11 Solid slabs supported on girders, beams, joists or structural concrete walls .82
11.1 General .82
11.2 Design load definition .82
11.2.1 Loads to be included .82
11.2.2 Dead load and live load .82
11.2.3 Factored design loads .82
11.3 Details of reinforcement .83
11.3.1 General.83
11.3.2 Shrinkage and temperature reinforcement .83
11.3.3 Positive flexural reinforcement .83
11.3.4 Negative flexural reinforcement .84
11.3.5 Shear reinforcement .85
11.3.6 Corner reinforcement .85
11.4 Top thin solid slab that spans between joists .87
11.4.1 Dimensional guidelines .87
11.4.2 Factored bending moment .87
11.4.3 Reinforcement .87
11.4.4 Shear strength verification.88
11.4.5 Calculation of the reactions on the joists .88
11.5 Cantilevers of slabs supported on girders, beams or walls .88
11.5.1 Dimensional guidelines .88
11.5.2 Factored negative bending moment . .88
11.5.3 Reinforcement .89
11.5.4 Shear verification .91
11.5.5 Calculation of reactions on the supports .
...

SLOVENSKI STANDARD
oSIST ISO 15673:2018
01-maj-2018
Smernice za poenostavljeno projektiranje armiranobetonskih konstrukcij za stavbe
Guidelines for the simplified design of structural reinforced concrete for buildings
Lignes directrices pour la conception simplifiée du béton armé pour les structures de
bâtiments
Ta slovenski standard je istoveten z: ISO 15673:2016
ICS:
91.080.40 Betonske konstrukcije Concrete structures
oSIST ISO 15673:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST ISO 15673:2018

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oSIST ISO 15673:2018
INTERNATIONAL ISO
STANDARD 15673
Second edition
2016-12-01
Guidelines for the simplified design
of structural reinforced concrete for
buildings
Lignes directrices pour la conception simplifiée du béton armé pour
les structures de bâtiments
Reference number
ISO 15673:2016(E)
©
ISO 2016

---------------------- Page: 3 ----------------------
oSIST ISO 15673:2018
ISO 15673:2016(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved

---------------------- Page: 4 ----------------------
oSIST ISO 15673:2018
ISO 15673:2016(E)

Contents Page
Foreword .ix
Introduction .x
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms .13
4.1 Symbols .13
4.2 Abbreviated terms .16
5 Design and construction procedure .17
5.1 Procedure .17
5.1.1 Step A .17
5.1.2 Step B .17
5.1.3 Step C .17
5.1.4 Step D .17
5.1.5 Step E .17
5.1.6 Step F.17
5.1.7 Step G .17
5.1.8 Step H .17
5.1.9 Step I .17
5.1.10 Step J .18
5.1.11 Step K .18
5.2 Design documentation .19
5.2.1 General.19
5.2.2 Calculation memoir .19
5.2.3 Geotechnical report .19
5.2.4 Structural drawings .19
5.2.5 Specifications .19
6 General guides .19
6.1 Limitations .19
6.1.1 Occupancy . .19
6.1.2 Maximum number of stories .20
6.1.3 Maximum area per floor .20
6.1.4 Maximum story height .20
6.1.5 Maximum span length .20
6.1.6 Maximum difference in span length .20
6.1.7 Minimum number of spans .21
6.1.8 Maximum cantilever span .21
6.1.9 Maximum slope for slabs, girders, beams and joists .21
6.1.10 Maximum slope of the terrain .21
6.1.11 Distance between centre of mass and centre of rigidity .21
6.2 Limit states .21
6.3 Ultimate limit state design format .21
6.3.1 General.21
6.3.2 Required factored strength .22
6.3.3 Design strength .22
6.4 Serviceability limit state design format .22
7 Specific guides .23
7.1 Structural systems and layout .23
7.1.1 Description of the components of the structure .23
7.1.2 General programme .24
7.1.3 Structural layout . . .25
7.1.4 Feasibility under the guidelines .28
© ISO 2016 – All rights reserved iii

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oSIST ISO 15673:2018
ISO 15673:2016(E)

8 Actions (loads) .29
8.1 General .29
8.1.1 Load factors and load combinations .29
8.1.2 Mass of materials .31
8.1.3 Dead loads .31
8.1.4 Live loads .32
8.1.5 Specified snow load .32
8.1.6 Specified wind forces .32
8.1.7 Specified earthquake forces .32
8.1.8 Seismic design base shear .39
9 General reinforced concrete requirements .40
9.1 General .40
9.2 Additional requirements .40
9.3 Materials for reinforced concrete .40
9.3.1 General.40
9.3.2 Cement .40
9.3.3 Aggregates .40
9.3.4 Water .40
9.3.5 Steel reinforcement .40
9.3.6 Admixtures . .41
9.3.7 Storage of materials .41
9.3.8 Minimum and maximum reinforcement bar diameter .41
9.3.9 Concrete mixture specification .42
9.3.10 Concrete cover to reinforcement .42
9.3.11 Minimum reinforcement bend diameter .43
9.3.12 Standard hook dimensions .44
9.3.13 Bar spacing and maximum aggregate size.45
9.3.14 Maximum nominal coarse aggregate size .45
9.3.15 Minimum clear spacing between parallel bars in a layer .46
9.3.16 Minimum clear spacing between parallel layers of reinforcement .46
9.3.17 Minimum clear spacing between longitudinal bars in columns .47
9.3.18 Clear spacing between parallel lap splices .48
9.3.19 Maximum flexural reinforcement spacing in solid slabs .48
9.3.20 Maximum shrinkage and temperature reinforcement spacing in solid slabs .48
9.3.21 Maximum reinforcement spacing in structural concrete walls .49
9.3.22 Special details per element type .49
9.4 Development length, lap splicing and anchorage of reinforcement.49
9.4.1 Development length .49
9.4.2 Lap splice dimensions .51
9.4.3 Minimum standard hook anchorage distance .51
9.5 Limits for longitudinal reinforcement .52
9.5.1 General.52
9.5.2 Solid slabs and footings.52
9.5.3 Girders, beams and joists .53
9.5.4 Columns .55
9.5.5 Structural concrete walls .55
9.6 Minimum amounts of transverse reinforcement .56
9.6.1 General.56
9.6.2 Slabs .56
9.6.3 Girders, beams and joists .56
9.6.4 Columns .56
9.6.5 Structural concrete walls .60
9.7 Strength of members subjected to bending moments .61
9.7.1 General.61
9.7.2 Factored bending moment at section .61
9.7.3 Minimum design bending moment strength .61
9.7.4 Design moment strength for rectangular sections with tension
reinforcement only . .61
iv © ISO 2016 – All rights reserved

---------------------- Page: 6 ----------------------
oSIST ISO 15673:2018
ISO 15673:2016(E)

9.7.5 Use of compression reinforcement in girders, beams, and joists .62
9.7.6 T-beam effect .64
9.8 Strength of members subjected to shear stresses .66
9.8.1 General.66
9.8.2 Factored shear .67
9.8.3 Design shear strength .67
9.8.4 Beam-action shear .67
9.8.5 Two-way action shear (punching shear) in solid slabs and footings .70
10 Floor systems .71
10.1 Types of floor systems .71
10.1.1 General.71
10.1.2 Slab-on-girder system .71
10.1.3 Description of the basic system .71
10.1.4 Joist systems .74
10.2 Criteria for the selection of the floor system.77
10.3 Guides for structural integrity .78
10.3.1 General.78
10.3.2 Perimeter girders in slab-and-girder and joist systems .78
10.3.3 Other beams and girders .78
10.3.4 Joists .78
10.4 One-way and two-way slabs and load path .78
10.4.1 General.78
10.4.2 One-way behaviour . .78
10.4.3 Two-way behaviour .79
10.4.4 Floor system load path .79
10.5 Minimum depth for elements of the floor system .79
10.5.1 General.79
10.5.2 Solid one-way slabs supported by girders, beams, joists, or structural walls .79
10.5.3 Girders, beams and one-way joists supporting the slab .80
10.5.4 Two-way slabs supported by girders, beams, or structural concrete walls.81
10.6 Initial trial dimensions for the floor system .82
11 Solid slabs supported on girders, beams, joists or structural concrete walls .82
11.1 General .82
11.2 Design load definition .82
11.2.1 Loads to be included .82
11.2.2 Dead load and live load .82
11.2.3 Factored design loads .82
11.3 Details of reinforcement .83
11.3.1 General.83
11.3.2 Shrinkage and temperature reinforcement .83
11.3.3 Positive flexural reinforcement .83
11.3.4 Negative flexural reinforcement .84
11.3.5 Shear reinforcement .85
11.3.6 Corner reinforcement .85
11.4 Top thin solid slab that spans between joists .87
11.4.1 Dimensional guidelines .87
11.4.2 Factored bending moment .87
11.4.3 Reinforcement .87
11.4.4 Shear strength verification.88
11.4.5 Calculation of the reactions on the joists .88
11.5 Cantilevers of slabs supported on girders, beams or walls .
...