prEN 16612

SLOVENSKI STANDARD
01-september-2013
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Glass in building - Determination of the load resistance of glass panes by calculation and
testing
Glas im Bauwesen - Bestimmung des Belastungswiderstandes von Glasscheiben durch
Berechnung und Prüfung
Verre dans la construction - Détermination de la résistance des feuilles de verre par
calcul et par essai
Ta slovenski standard je istoveten z: prEN 16612
ICS:
81.040.20 Steklo v gradbeništvu Glass in building
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2013
ICS 81.040.20
English Version
Glass in building - Determination of the load resistance of glass
panes by calculation and testing
Verre dans la construction - Détermination de la résistance Glas im Bauwesen - Bestimmung des
des feuilles de verre par calcul et par essai Belastungswiderstandes von Glasscheiben durch
Berechnung und Prüfung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 129.

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

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 16612:2013: E
worldwide for CEN national Members.

Contents Page
Foreword .4
Introduction .5
1 Scope .6
2 Normative references .6
3 Terms and definitions .7
4 Symbols and abbreviations .9
5 Requirements . 14
5.1 Basis of determination of load resistance of glass . 14
5.2 General requirements . 15
5.3 Material partial factor . 15
5.4 Process of determining the load resistance of glass . 15
6 Mechanical and physical properties of glass . 16
6.1 Values . 16
6.2 Approximate values . 16
7 Actions . 16
7.1 Assumptions related to the actions and combinations of actions . 16
7.2 Combinations of actions . 16
8 Strength and stress . 18
8.1 Design value of strength for annealed glass . 18
8.1.1 Formulae . 18
8.1.2 Glass surface profile factor . 18
8.1.3 Factor for duration of load . 19
8.2 Design value of strength for prestressed glass . 20
8.2.1 Formula . 20
8.2.2 Characteristic bending strength . 21
8.2.3 Strengthening factor . 21
9 Calculation principles and conditions . 21
9.1 General method of calculation . 21
9.1.1 Design load . 21
9.1.2 Stress and deflection calculation. 22
9.1.3 Design value of strength . 22
9.1.4 Design value of deflection . 22
9.1.5 Comparisons of stress and deflection . 22
9.2 Calculation method for laminated glass and laminated safety glass . 23
9.2.1 Calculation method. 23
9.2.2 Simplified method . 23
9.2.3 Determination of ω . 24
9.3 Calculation method for insulating glass units . 25
Annex A (normative) Principles of determining the load resistance of glass by testing . 27
A.1 General . 27
A.2 Factors affecting load resistance . 28
A.3 Effect of rate and duration of loading . 28
A.4 Effect of stressed surface area . 29
A.5 Surface condition. 29
A.6 Temperature . 29
Annex B (informative) Calculation formulae for stress and deflection for large deflections of
rectangular panes supported on all edges . 30
Annex C (informative) Calculation process for insulating glass units . 33
C.1 Double glazed insulating glass units . 33
C.1.1 Sign convention for actions and effects . 33
C.1.2 General . 33
C.1.3 Distribution (partition) of external loads (load sharing) . 34
C.1.4 Effect of internal loads . 34
C.1.5 Calculation of double glazed insulating glass unit cavity temperature . 35
C.2 Triple glazed insulating glass units . 36
C.2.1 Sign convention for actions and effects . 36
C.2.2 Calculation process . 36
C.2.3 Calculation of triple glazed insulating glass unit cavity temperature . 39
C.3 Calculation of the insulating glass unit seal edge force . 40
Annex D (informative) Proposal for a model of a National Annex . 41
D.1 Partial material factors . 41
D.2 Partial load factors . 41
D.3 Factors for load duration, k . 42
mod
D.4 Deflection limits . 42
Bibliography . 43

Foreword
This document (prEN 16612:2013) has been prepared by Technical Committee CEN/TC 129 “Glass in
building”, the secretariat of which is held by NBN.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
Introduction
This European Standard gives the principles of determining the load resistance of glass.
The principles of determining the load resistance of glass are based on the structural Eurocode EN 1990:
Basis of structural design. The actions are determined in accordance with the structural Eurocode series
EN 1991: Basis of structural design - Actions on structures, including the National annexes.
In the design processes, the reliability is part of national competency. For that reason this European Standard
foresees that, to conform the rules applied by the Eurocodes, the material partial factors γ are subject to
M
nationally determined parameters:
– values for the ultimate limit state (ULS).
The values can be found in an informative (National) annex to this European Standard.
When a Member State does not use its prerogative and no values for the material partial factor have been
determined, the recommended values given in this European Standard should be used.
1 Scope
This European Standard gives the principles of determining the load resistance of glass. It gives
• the general method of calculation, and
• determination of load resistance by testing for any application.
This European Standard does not determine suitability for purpose. Resistance to applied loads is only one
part of the design process, which may also need to take into account
• environmental factors (e.g. sound insulation, thermal properties),
• safety characteristics (e.g. fire performance
...