SIST EN 16929:2019

SLOVENSKI STANDARD
oSIST prEN 16929:2016
01-januar-2016
Preskusne metode - Leseni stropi - Ugotavljanje vibracijskih lastnosti
Test Methods - Timber flooring systems - Determination of vibration properties
Prüfverfahren - Holzdecken - Bestimmung der Schwingungseigenschaften
Méthodes d’essais - Systèmes de plancher en bois - Détermination des propriétés
vibratoires
Ta slovenski standard je istoveten z: prEN 16929
ICS:
91.060.30 Stropi. Tla. Stopnice Ceilings. Floors. Stairs
91.080.20 Lesene konstrukcije Timber structures
oSIST prEN 16929:2016 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 16929:2016

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oSIST prEN 16929:2016


DRAFT
EUROPEAN STANDARD
prEN 16929
NORME EUROPÉENNE

EUROPÄISCHE NORM

October 2015
ICS 91.060.30; 91.080.20
English Version

Test Methods - Timber flooring systems - Determination of
vibration properties
Méthodes d'essais - Systèmes de plancher en bois - Testverfahren - Holzdecken - Bestimmung von
Détermination des propriétés vibratoires Schwingungseigenschaften
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 124.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 16929:2015 E
worldwide for CEN national Members.

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Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Determination of dimensions of flooring systems . 8
5 Determination of moisture content . 8
6 Determination of the floor mass . 8
7 Conditioning . 8
8 Laboratory tests . 8
8.1 Determination of the fundamental frequency . 8
8.1.1 Principle . 8
8.1.2 Test setup . 8
8.1.3 Support detailing . 9
8.1.4 Test procedure . 11
8.1.5 Apparatus . 11
8.1.6 Results . 11
8.2 Determination of damping ratio . 11
8.3 Determination of the static unit point load deflection . 12
8.3.1 General . 12
8.3.2 Test setup . 12
8.3.3 Test procedure . 13
8.3.4 Results . 13
8.3.5 Apparatus . 13
8.4 Determination of the floor acceleration amplification . 13
8.4.1 General . 13
8.4.2 Test setup . 13
8.4.3 Test procedure . 14
8.4.4 Results . 14
8.4.5 Apparatus . 14
9 In situ testing . 14
9.1 Determination of the fundamental frequency . 14
9.1.1 Test setup . 14
9.1.2 Test procedure . 14
9.1.3 Results . 15
9.1.4 Apparatus . 15
9.2 Determination of damping ratio . 15
9.3 Determination of the static unit point load deflection . 15
9.3.1 Test setup . 15
9.3.2 Test procedure . 15
9.3.3 Results . 16
9.3.4 Apparatus . 16
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9.4 Determination of the floor acceleration amplification . 16
9.4.1 Test setup . 16
9.4.2 Test procedure . 16
9.4.3 Results . 16
9.4.4 Apparatus . 16
10 Test Report . 17
Annex A (normative) Determination of the fundamental frequency using a dead load drop
from below . 18
Bibliography . 21

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European foreword
This document (prEN 16929:2015) has been prepared by Technical Committee CEN/TC 124 “Timber
Structures”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
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Introduction
The serviceability requirements of timber floors with timber or wood based decking become more
decisive in design because of the use of high strength materials, prefabricated timber construction
elements and longer spans. Beside deflection requirements for static loads given in appropriate design
codes the dynamic aspects have to be considered, especially for lightweight timber floors where a
pedestrian body mass is quite influential. Human footfall is a significant source of vibration and if its
effects are not assessed accurately during the design of a lightweight floor structure it may be rendered
uncomfortable for occupants.
Vibrations induced by footsteps in floors can annoy occupants or disturb operation of sensitive
equipment and processes, if the vibrations are not properly controlled. Proper controlling relies on a
good understanding of the nature of floor vibrations induced by footsteps. The magnitude and type of
floor vibrations induced by footsteps from normal walking are mainly controlled by the inherent
dynamic properties of the floor system: stiffness, mass and its capacity to dissipate vibration energy
(damping). These properties are in turn determined by floor materials, design and construction.
When assessing the response of lightweight floor structures to pedestrian induced vibration, only
frequencies below 40-50 Hz are of interest. Floors with a fundamental frequency below 8 Hz are
labelled as a low-frequency floor and will have to deal with resonance effects caused by walking action.
Vibrations with frequencies over 40-50 Hz are no longer perceivable by occupants.
When assessing vibration modes of a timber floor structure supported on two opposite sides it is
assumed that in the span direction only the first-order fundamental vibration mode is occurring. Since
the stiffness in transverse direction is usually much lower than in span direction, vibration modes will
excite in the transverse direction. Several vibration modes in the 8 – 40/50 Hz range may occur.
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1 Scope
This European Standard specifies test methods for the determination of the fundamental frequency,
damping, unite point load deflection and acceleration amplification of timber or wood-based
engineering beams and flooring systems.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 13183 (all parts), Moisture content of a piece of sawn timber
EN 322, Wood-based panels - Determination of moisture content
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
decking
surface element that contributes to the integrity of the flooring system and is connected to the joists.
The characteristic of the decking is that it is supported by joists and, when subjected to load, free to
deflect between the joists
3.2
flooring system
specified assembly of joists and decking
3.3
fundamental frequency
lowest first-order natural vibration frequency
3.4
joist
beam made of timber or timber in combination with a wood based engineered product to support and
connect to the decking
3.5
natural frequency
a frequency in which a specimen oscillates in a free vibration mode each vibration mode has its own
natural frequency
3.6
span
distance between supports parallel to the main floor load bearing elements
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3.7
internal support beam
a beam that acts as a non-rigid support for joists
Note 1 to entry: A support beam act as intermediate support or as end-supports for joists.
3.8
vibration
the oscillation of a system about its equilibrium position
3.9
vibration mode
the behaviour of a system or an object that is characterized by its natural frequency, modal damping
and mode shape
Note 1 to entry A system can have many vibration modes and multiple vibration modes can be oscillating (and
interfering) at the same time. Each vibration mode depends on the structure configurations, material properties
and boundary conditions of the system.
3.10
damping
damping is the energy dissipation of a vibrating system
Note 1 to entry Damping consist of material and structural damping as well as damping by furniture and floor
finishing (floating floor).
Note 2 to entry Figure 1 shows a typical flooring system.

Key
1 joist
2 span
3 edge support for joists
4 interior support beam
5 width
6 decking
Figure 1 — Typical flooring system
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4 Determination of dimensions of flooring systems
The span, width and depth of the flooring system shall be measured:
— in laboratory tests to an accuracy of 1mm. The depth measurements shall not be taken at a location
closer than 150 mm to the ends;
— in situ tests to an accuracy of 1 % or 10 mm, whichever is less.
5 Determination of moisture content
For laboratory tests: The moisture content of the flooring system components shall be determined, for
timber in accordance with EN 13183, and for wood-based products in accordance with EN 322.
6 Determination of the floor mass
For laboratory tests, the weight of the whole flooring system or individual components shall be
determined using scales with an accuracy of less than 1 % or 0,1 kg whichever is less and reported in
2
kg/m .
7 Conditioning
For in situ and laboratory tests, the temperature and relative humidity of the environment shall be
recorded
8 Laboratory tests
8.1 Determination of the fundamental frequency
8.1.1 Principle
A supported flooring system is exposed to an impulse load and acceleration measurements are taken.
From the data the acceleration response shall be determined and the fundamental frequency calculated.
8.1.2 Test setup
The flooring system is simply supported on a rigid support structure. Accelerometers are used to
measure the vibration or other measuring devices may be used provided they produce reliable test
data. The accelerometer shall be attached to the flooring system at the geometrical floor centre.
During the frequency tests the background noise produced by the structure that holds the supports or
other vibration producing surrounding devices should be kept to a minimum to avoid interference with
the test results. For this reason the bending stiffness of the supporting structure should be considerably
higher than the flooring system.
NOTE 1 If there is an interest in higher vibration modes or transverse vibration modes more accelerometers
can be used.
Before the floor test the natural frequencies of the supporting structure should be measured in each
direction. This can be done using the same equipment and releasing a hammer or alternative peak-load
on the supporting structure. None of the natural frequencies of the supporting structure shall be in
interfering range of the expected fundamental frequency of the flooring system.
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NOTE 2 Altering the natural frequencies of the supporting structure can be done by adjusting weight and/or
stiffness.
8.1.3 Support detailing
Support conditions at both ends shall be reliable such that interference with the vibration frequency of
the flooring system during the test is kept to a minimum. Trials to find out which support material and
which conditions produce rel
...