ISO 18408:2019

Simplified structural design for reinforced concrete wall buildings

This document applies to reinforced concrete building consisting of load bearing walls of reinforced concrete buildings [such buildings are called reinforced concrete box-shaped wall buildings and (RC wall building)] or to the part of RC wall building which uses both this and other types of structure. This document applies to RC wall building as follows: — RC wall building with 5 or fewer aboveground storeys; — eaves height of 16 m or less; — storey height on each storey of 3 m or less; — on the top storey, the storey height can be 3,3 m or less; — if the roof has a slope, the sum of the storey height of the top storey and the height from the eaves to the ridge of 4 m or less. Deep foundations, such as piles and caissons, and their pile footings and caps, are beyond the scope of this document, and are not covered by it.

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General Information

• Status: Published
• Publication Date: 03-Sep-2019
• ICS: 91.080.40 - Concrete structures
• Technical Committee: ISO/TC 71/SC 5 - Simplified design standard for concrete structures
• Drafting Committee: ISO/TC 71/SC 5 - Simplified design standard for concrete structures
• Current Stage: 6060 - International Standard published
• Due Date: 26-May-2018
• Completion Date: 04-Sep-2019

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 18408
First edition
2019-08
Simplified structural design for
reinforced concrete wall buildings
Reference number
ISO 18408:2019(E)
©
ISO 2019

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ISO 18408:2019(E)

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ii © ISO 2019 – All rights reserved

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ISO 18408:2019(E)

Contents Page
Foreword .vi
Introduction .vii
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 Symbols .3
5 Materials for reinforced concrete .6
5.1 General . 6
5.2 Cement . 6
5.3 Aggregates . 6
5.4 Water . 6
5.5 Admixtures . 6
5.6 Storage of materials . 6
5.7 Steel reinforcement . 6
5.8 Deformed reinforcement . 6
5.9 Welded-wire fabric . 6
5.10 Plain reinforcement . 6
5.11 Concrete mixture specification . 7
6 Design and construction procedure .7
6.1 Procedure . 7
6.2 Limit states . 8
6.3 Ultimate limit state design format . 9
6.3.1 General. 9
6.3.2 Required factored strength . 9
6.3.3 Design strength . 9
6.4 Serviceability limit state design format . 9
6.5 Design documentation .10
6.5.1 General.10
6.5.2 Calculation memoir .10
6.5.3 Geotechnical report .10
6.5.4 Structural drawings .10
6.5.5 Specifications .10
7 Limitations .11
7.1 General .11
7.2 Occupancy .11
7.3 Maximum number of storeys .11
7.4 Maximum storey height .11
7.5 Minimum wall area ratio .11
7.6 Upper limit of average shear stress .11
7.7 Maximum storey drift angle .11
8 Specific requirements .12
8.1 Structural systems .12
8.1.1 Floor system .12
8.1.2 Vertical supporting elements .12
8.1.3 Foundation .12
8.1.4 Lateral load resisting system.12
8.1.5 Other structural elements .12
8.2 General program .12
8.2.1 Architectural program .12
8.2.2 General structural requirements for the project .13
8.3 Structural layout .13
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ISO 18408:2019(E)

8.3.1 General structural layout .13
8.3.2 Floor planning of bearing walls .13
8.3.3 Elevation planning of bearing walls .14
9 Actions (loads) .16
9.1 General .16
9.1.1 Load factors and load combinations .16
9.2 Mass of materials .18
9.3 Dead loads .18
9.4 Live loads .19
9.5 Specified snow load .19
9.6 Specified wind forces .19
9.7 Specified earthquake forces .19
9.7.1 General.19
9.7.2 Seismic hazard .20
9.7.3 No seismic hazard zones: .20
9.7.4 Low seismic hazard zones: .20
9.7.5 Intermediate seismic hazard zones: .20
9.7.6 High seismic hazard zones: .20
9.7.7 Soil profile types.26
9.7.8 Site effects .27
9.7.9 Design response spectral ordinates .27
9.8 Seismic design base shear .27
9.8.1 Seismic-resistant structural system .27
9.8.2 Energy-dissipation capacity of the seismic-resistant structural system .28
9.8.3 Computation of the seismic design base shear .28
9.8.4 Vertical distribution of the design seismic forces and the design storey
shear forces .28
10 Analysis .28
10.1 Method of analysis for moment, shear and axial force of members .28
10.1.1 General.28
10.1.2 Simplified method .29
10.2 Method of analysis for storey drift angle .33
10.2.1 General.33
10.2.2 Simplified method .33
11 Structural concrete walls .34
11.1 General .34
11.2 Design load definition .34
11.3 Dimensional guides .34
11.3.1 General.34
11.3.2 Limiting dimensions .34
11.4 Details of reinforcement .35
11.4.1 General.35
11.4.2 Shear reinforcement .36
11.4.3 Flexural reinforcement .37
12 Wall girders .38
12.1 General .38
12.2 Design strength .38
12.2.1 Flexural strength .38
12.2.2 Shear strength .38
12.3 Details of reinforcement .39
12.3.1 General.39
12.3.2 Vertical reinforcement .39
12.3.3 Longitudinal reinforcement .40
13 Wall — Wall girder joints .41
13.1 General .41
13.2 Design strength .41
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ISO 18408:2019(E)

13.3 Development length for reinforcing bars .42
13.4 Details of reinforcement .43
14 Floor slab .43
14.1 General .43
14.2 Design load definition .43
14.2.1 Loads to be included .43
14.2.2 Dead load and live load .43
14.2.3 Factored design load . .43
14.3 Two-way solid slabs supported on wall girders or structural concrete walls .43
14.3.1 Dimensional guides .43
14.3.2 Design strength .44
14.3.3 Design bending moment .45
14.4 End anchorage of reinforcement .46
15 General reinforced concrete requirements .46
15.1 General .46
15.2 Cover concrete depth .46
15.2.1 Minimum concrete cover .46
15.2.2 Special fire protection .48
15.2.3 Special corrosion protection . .48
15.3 Minimum and maximum reinforcement bar diameter .48
15.4 Minimum reinforcement bend diameter .49
15.5 Standard hook dimensions .49
15.6 Bar separation and maximum aggregate size .50
15.6.1 General.50
15.6.2 Maximum nominal coarse aggregate size .50
15.6.3 Minimum clear spacing between parallel bars in a layer .51
15.6.4 Minimum clear spacing between parallel layers of reinforcement .51
15.6.5 Clear spacing between parallel lap splices .51
15.7 Development length, lap splicing and anchorage of reinforcement.51
15.7.1 Development length .51
15.7.2 Lap splice dimensions .53
15.7.3 Minimum standard hook anchorage distance .54
16 Foundations .54
16.1 Dimensioning of the foundation elements .54
16.2 Footings .55
16.2.1 Moment in footings .55
16.2.2 Shear in footings .55
16.2.3 Development of reinforcement in footings .55
16.2.4 Minimum footing depth .56
16.2.5 Transfer of forces at base of column, wall or reinforced pedestal .56
16.2.6 Sloped or stepped footings.56
16.3 Foundation mats .56
16.4 Footings on piles .56
16.4.1 General.56
16.4.2 Anchorage of reinforcement .56
16.4.3 Maximum axial stresses .56
16.4.4 Reinforcement minimum ratios and lengths .57
16.5 Foundation beams .57
16.5.1 Dimensional guides .57
16.5.2 Longitudinal reinforcement .
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