ISO 24323:2023

Timber structures — Design method for vibrational serviceability of timber floors

The design method provided in this document addresses vibration induced by walking action of occupants and covers the following timber floor systems: a) Light frame floors built with timber joists spaced at a distance of no more than 610 mm with a layer of structural wood-based subfloor that is connected to the joists using mechanical fasteners or adhesive. The area density of a bare light frame floors without a screed (topping) and ceiling is not greater than 25 kg/m2. Figure 1 shows such a light frame floor. b) Mass timber floors built with mass timber panels such as cross laminated timber (CLT). This document consists of three elements: a) a baseline vibrational serviceability design criterion for timber floors using fundamental natural frequency and 1 kN static point load deflection as the design parameters including two types of design criteria, coupled and decoupled criteria; b) equations for calculating the design parameters; c) guidelines for the design values of the physical and mechanical properties of floor components. The design method is based on the assumption that the floor system has a single span and simple support conditions.

Structures en bois – Méthode de dimensionnement aux états limites de service pour la vibration des planchers bois

General Information

• Status: Published
• Publication Date: 07-Dec-2023
• ICS: 91.080.20 - Timber structures
• Technical Committee: ISO/TC 165 - Timber structures
• Drafting Committee: ISO/TC 165/WG 7 - Connections and assemblies
• Current Stage: 6060 - International Standard published
• Start Date: 08-Dec-2023
• Due Date: 09-Sep-2023
• Completion Date: 08-Dec-2023

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 24323
First edition
2023-12
Timber structures — Design method
for vibrational serviceability of timber
floors
Structures en bois – Méthode de dimensionnement aux états limites de
service pour la vibration des planchers bois
Reference number
ISO 24323:2023(E)
© ISO 2023

---------------------- Page: 1 ----------------------
ISO 24323:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
  © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 24323:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Baseline timber floor vibrational serviceability design criterion .1
5 General models for calculating f and d . 2
1 kN
6 Simplified calculation procedures for light-frame timber joisted floors .4
6.1 Floor construction . 4
6.2 Calculation of first natural frequency and static deflection under a 1 kN load at
floor centre . 4
6.3 Effective composite bending stiffness, D . 5
ef
6.4 Transverse system stiffness factor, K . 6
t
7 Simplified calculation procedures for mass timber floors . 7
7.1 Floor construction . 7
7.2 Calculation of first natural frequency and static deflection under a 1 kN load at
floor centre . 7
8 Design values of floor components .8
Annex A (informative) Coupled criteria for timber floor vibrational serviceability design .9
Annex B (informative) Decoupled criteria for timber floor vibrational serviceability design .12
Annex C (informative) Explanatory notes .14
Bibliography .
...

INTERNATIONAL ISO
STANDARD 24323
First edition
Timber structures — Design method
for vibrational serviceability of timber
floors
Structures en bois – Méthode de dimensionnement aux états limites de
service pour la vibration des planchers bois
PROOF/ÉPREUVE
Reference number
ISO 24323:2023(E)
© ISO 2023

---------------------- Page: 1 ----------------------
ISO 24323:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
PROOF/ÉPREUVE © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 24323:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Baseline timber floor vibrational serviceability design criterion .1
5 General models for calculating f and d . 2
1 kN
6 Simplified calculation procedures for light-frame timber joisted floors .4
6.1 Floor construction . 4
6.2 Calculation of first natural frequency and static deflection under a 1 kN load at
floor centre . 4
6.3 Effective composite bending stiffness, D . 5
ef
6.4 Transverse system stiffness factor, K . 6
t
7 Simplified calculation procedures for mass timber floors . 7
7.1 Floor construction . 7
7.2 Calculation of first natural frequency and static deflection under a 1 kN load at
floor centre . 7
8 Design values of floor components .8
Annex A (informative) Coupled criteria for timber floor vibrational serviceability design .9
Annex B (informative) Decoupled criteria for timber floor vibrational serviceability design .12
Annex C (informative) Explanatory notes .14
Bibliography .
...

Date: 2023-09-26 Style Definition: Heading 1: Indent: Left: 0 pt, First line: 0
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ISO/PRF 24323:2023(E)
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ISO/TC 165/WG 7
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Date: 2023-XX
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Timber structures — Design method for vibrational serviceability of timber floors
Élément introductif — Élément principal — Partie n: Titre de la partie
Structures en bois — Méthode de dimensionnement aux états limites de service pour la vibration
des planchers bois

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ISO/PRF 24323:2023(E)
Copyright notice
This ISO document is a working draft or committee draft and is copyright-protected by ISO. While
the reproduction of working drafts or committee drafts in any form for use by participants in the
ISO standards development process is permitted without prior permission from ISO, neither this
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Reproduction for sales purposes may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
ii © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/PRF 24323:2023(E)
Contents Page
Foreword . 3
Introduction . 4
1 Scope . 5
2. Normative references . 5
3 Baseline timber floor vibrational serviceability design criterion . 5
4 General models for calculating f and d . 6
1kN
5 Simplified calculation procedures for light-frame timber joisted floors . 7
5.1 Floor construction . 7
5.2 Calculation of first natural frequency and static deflection under a 1 kN load at floor
centre . 7
6 Simplified calculation procedures for mass timber floors . 9
6.1 Floor construction . 9
6.2 Calculation of first natural frequency and static deflection under a 1 kN load at floor
centre . 9
7. Design values of floor components . 10
A.2 Selection of design parameters . 11
A.3 Assembling an international database of timber floor vibration serviceability . 11
A.4 Decision on the mathematical models for calculation of the design parameters . 11
A.5 Derivation of the baseline timber floor vibrational serviceability design criterion
through logistic regression . 11
Bibliography .
...