ISO 20987:2019

Simplified design for mechanical connections between precast concrete structural elements in buildings

This document refers to connections in precast frame systems, either for single-storey or multi-storey buildings. The connections for all orders of joints are considered. Large wall panel and three-dimensional cell systems are not considered. According to the position in the overall construction and of the consequent different structural functions, the seven following orders of joints are considered: a) mutual joints between floor or roof elements (floor-to-floor) that, in the seismic behaviour of the structural system, concern the diaphragm action of the floor; b) joints between floor or roof elements and supporting beams (floor-to-beam) that give the peripheral constraints to the floor diaphragm in its seismic behaviour; c) joints between beam and column (beam-to-column) that ensure in any direction the required degree of restraint in the frame system; d) joints between column segments (column-to-column) used for multi-storey buildings usually for dual wall braced systems; e) joints between column and foundation (column-to-foundation), able to ensure in any plane a fixed full support of the column; f) fastenings of cladding panels to the structure (panel-to-structure) that ensure the stability of the panels under the high forces or the large drifts expected under seismic action; g) joints between adjacent cladding panels (panel-to-panel) possibly used to increase the stiffness of the peripheral wall system and provide an additional source of energy dissipation. Simple bearings working by gravity load friction are not considered. Sliding and elastic deformable supporting devices neither, being all these types of connections not suitable for the transmission of seismic actions. The document provides formulae for the strength design of a large number of joint typologies.

Conception simplifiée pour les assemblages mécaniques entre éléments structurels en béton préfabriqué dans les bâtiments

General Information

• Status: Published
• Publication Date: 10-Oct-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: 9020 - International Standard under periodical review
• Start Date: 15-Oct-2024
• Completion Date: 15-Oct-2024

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 20987
First edition
2019-10
Simplified design for mechanical
connections between precast concrete
structural elements in buildings
Conception simplifiée pour les assemblages mécaniques entre
éléments structurels en béton préfabriqué dans les bâtiments
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Properties .3
5 Classification .4
5.1 General . 4
5.2 Strength . 4
5.3 Ductility . 4
5.3.1 Ductile connections . 4
5.4 Dissipation . 5
5.5 Deformation . 5
6 Floor-to-floor connections .5
6.1 Cast-in-situ topping . 5
6.1.1 General. 5
6.1.2 Strength . 6
6.1.3 Other properties . 6
6.2 Cast-in-situ joints . 6
6.2.1 General. 6
6.2.2 Strength . 6
6.2.3 Other properties . 7
6.3 Welded steel connectors . 7
6.3.1 General. 7
6.3.2 Strength . 7
6.3.3 Other properties .10
6.4 Bolted steel connectors .10
6.4.1 General.10
6.4.2 Strength .10
6.4.3 Other properties .13
7 Floor-to-beam connections .14
7.1 Cast-in-situ joints .14
7.1.1 General.14
7.1.2 Other properties .14
7.2 Supports with steel angles .14
7.2.1 General.14
7.2.2 Strength .16
7.2.3 Ductility .22
7.2.4 Dissipation .22
7.2.5 Deformation .23
7.2.6 Cyclic decay . . .23
7.2.7 Damage .23
7.3 Supports with steel shoes .23
7.3.1 General.23
7.3.2 Strength .23
7.3.3 Ductility .30
7.3.4 Dissipation .30
7.3.5 Deformation .30
7.3.6 Cyclic decay . . .30
7.3.7 Damage .30
7.4 Welded supports.30
7.4.1 General.30
7.4.2 Strength .31
7.4.3 Other properties .33
7.5 Hybrid connections .34
7.5.1 General.34
7.5.2 Strength .34
7.5.3 Other properties .37
8 Beam-to-column connections .37
8.1 Cast-in-situ joints .38
8.1.1 General.38
8.1.2 Strength .39
8.1.3 Ductility .41
8.1.4 Dissipation .42
8.1.5 Deformation .42
8.1.6 Cyclic decay . . .42
8.1.7 Damage .42
8.2 Dowel connections.42
8.2.1 General.42
8.2.2 Strength .
...

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ISO/TC 71/SC 5
Date: 2018‐01‐12
Deleted: /FDIS
ISO/TC 71/SC 5/WG 4
Secretariat: ICONTEC
Simplified design for mechanical connections between precast
concrete structural elements in buildings
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COPYRIGHT PROTECTED DOCUMENT
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
[e-mail]
www.iso.org
Error! Reference source not found.
ii
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Contents Page
Foreword . 6
Introduction . 7
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Properties . 3
5 Classification . 4
5.1 General . 4
5.2 Strength . 4
5.3 Ductility . 4
5.3.1 Ductile connections . 5
5.4 Dissipation . 5
5.5 Deformation . 5
6 Floor-to-floor connections . 6
6.1 Cast-in-situ topping . 6
6.1.1 General . 6
6.1.2 Strength . 6
6.1.3 Other properties . 6
6.2 Cast-in-situ joints . 7
6.2.1 General . 7
6.2.2 Strength . 7
6.2.3 Other properties . 7
6.3 Welded steel connectors . 7
6.3.1 General . 7
6.3.2 Strength . 8
6.3.3 Other properties . 11
6.4 Bolted steel connectors . 11
6.4.1 General . 11
6.4.2 Strength . 11
6.4.3 Other properties . 14
7 Floor-to-beam connections . 14
7.1 Cast-in-situ joints . 14
7.1.1 General . 14
7.1.2 Other properties . 15
7.2 Supports with steel angles . 15
7.2.1 General . 15
7.2.2 Strength . 17
7.2.3 Ductility . 23
7.2.4 Dissipation . 23
7.2.5 Deformation . 23
7.2.6 Cyclic decay . 23
7.2.7 Damage . 24
7.3 Supports with steel shoes . 24
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iii
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7.3.1 General . 24
7.3.2 Strength . 24
7.3.3 Ductility . 30
7.3.4 Dissipation . 30
7.3.5 Deformation . 30
7.3.6 Cyclic decay . 31
7.3.7 Damage . 31
7.4 Welded supports . 31
7.4.1 General . 31
7.4.2 Strength . 31
7.4.3 Other properties . 34
7.5 Hybrid connections . 34
7.5.1 General . 34
7.5.2 Strength . 34
7.5.3 Other properties . 37
8 Beam-to-column connections . 37
8.1 Cast-in-situ joints . 38
8.1.1 General . 38
8.1.2 Strength . 40
8.1.3 Ductility . 42
8.1.4 Dissipation . 42
8.1.5 Deformation . 42
8.1.6 Cyclic decay . 42
8.1.7 Damage . 42
8.2 Dowel connections . 42
8.2.1 General . 42
8.2.2 Strength . 43
8.2.3 Ductility . 49
8.2.4 Dissipation . 49
8.2.5 Deformation . 49
8.2.6 Cyclic decay . 49
8.2.7 Damage . 50
8.3 Mechanical coupler connections . 50
8.3.1 General . 50
8.3.2 Strength . 51
8.3.3 Ductility .
...