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
Current Stage
6060 - International Standard published
Start Date
06-Aug-2019
Completion Date
04-Sep-2019
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ISO 18408:2019 - Simplified structural design for reinforced concrete wall buildings
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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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© ISO 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

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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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