ISO 15673:2016

SLOVENSKI STANDARD
01-junij-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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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 2016
© 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
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ii © ISO 2016 – All rights reserved

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
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

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 .92
11.6 One-way one-span solid slabs spanning between girders, beams, or structural
concrete walls .92
11.6.1 Dimensional guidelines .92
11.6.2 Factored bending moment .92
11.6.3 Longitudinal flexural reinforcement .92
11.6.4 Shear verification .93
11.6.5 Calculation of the reactions on the supports .94
11.7 One-way solid slabs supported on girders, beams, or walls, with two or more spans .94
11.7.1 Dimensional guidelines .94
11.7.2 Factored bending moment .94
11.7.3 Longitudinal flexural reinforcement .95
11.7.4 Shear verification .97
11.7.5 Calculation of reactions on the supports .97
11.8 Two-way solid slabs spanning between girders, beams, or structural concrete walls .97
11.8.1 Dimensional guides .97
11.8.2 Factored flexural moment .98
11.8.3 Longitudinal flexural reinforcement .104
11.8.4 Shear verification .106
11.8.5 Calculation of the reactions on the supports .107
12 Girders, beams and joists .107
12.1 General .107
12.2 Design load definition .108
12.2.1 Loads to be included .108
12.2.2 Factored design loads .108
12.3 Details of reinforcement .109
12.3.1 General.109
12.3.2 Transverse reinforcement .109
12.3.3 Positive flexural reinforcement .110
12.3.4 Negative flexural reinforcement .111
12.3.5 Joists and beams supported on girders .115
13 Columns .123
13.1 General .123
13.2 Design load definition .123
13.2.1 Loads to be included .123
13.2.2 Dead load and live load .125
13.2.3 Factored design loads .126
13.3 Dimensional guidelines .126
13.3.1 General.126
13.3.2 Limiting section dimensions .126
13.3.3 Distance between lateral supports .127
13.3.4 Column built monolithically with wall .128
13.4 Details of reinforcement .128
13.4.1 General.128
13.4.2 Longitudinal reinforcement .128
13.4.3 Transverse reinforcement .132
13.5 Flexural design guidelines .132
13.5.1 Factored loads .132
13.5.2 Initial trial cross-section dimensions and longitudinal reinforcement .132
13.6 Shear design guidelines .133
13.6.1 Factored shear .133
13.6.2 Shear strength verification.134
13.6.3 Biaxial shear strength verification .134
13.7 Strength of members subjected to axial loads with or without flexure .134
13.7.1 General.134
13.7.2 Combined factored axial load and factored bending moment.134
13.7.3 Design strength for axial compression .135
13.7.4 Balanced strength for axial compression with flexure .135
vi © ISO 2016 – All rights reserved

14 Structural concrete walls .139
14.1 General .139
14.2 Design load definition .139
14.2.1 Loads to be included .139
14.2.2 Dead load and live load .142
14.2.3 Lateral design load .142
14.2.4 Factored design load . .143
14.3 Dimensional guidelines .143
14.3.1 General.143
14.3.2 Limiting dimensions .143
14.4 Details of reinforcement .144
14.4.1 General.144
14.4.2 Number of curtains of reinforcement .145
14.4.3 Vertical reinforcement .145
14.4.4 Horizontal reinforcement .146
14.4.5 Structural concrete wall reinforcement in seismic zones .147
14.5 Flexural design guidelines .147
14.5.1 Required factored loads .147
14.5.2 Initial trial vertical reinforcement .147
14.5.3 Required factored moment strength verification .147
14.6 Shear guides .147
14.6.1 Factored shear .147
14.6.2 Shear strength verification.147
14.7 Calculation of reactions at the foundation .148
14.7.1 Load reaction .
...