SIST EN 1991-1-7:2006/A1:2014

SLOVENSKI STANDARD
01-julij-2014
Evrokod 1: Vplivi na konstrukcije -1-7. del: Splošni vplivi - Nezgodni vplivi
Eurocode 1 - Actions on structures - Part 1-7: General actions - Accidental actions
Eurocode 1 - Einwirkungen auf Tragwerke - Teil 1-7: Allgemeine Einwirkungen -
Außergewöhnliche Einwirkungen
Eurocode 1 - Actions sur les structures - Partie 1-7: Actions générales - Actions
accidentelles
Ta slovenski standard je istoveten z: EN 1991-1-7:2006/A1:2014
ICS:
91.010.30 7HKQLþQLYLGLNL Technical aspects
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 1991-1-7:2006/A1
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2014
ICS 91.010.30
English Version
Eurocode 1 - Actions on structures - Part 1-7: General actions -
Accidental actions
Eurocode 1 - Actions sur les structures - Partie 1-7 : Actions Eurocode 1 - Einwirkungen auf Tragwerke - Teil 1-7:
générales - Actions accidentelles Allgemeine Einwirkungen - Außergewöhnliche
Einwirkungen
This amendment A1 modifies the European Standard EN 1991-1-7:2006; it was approved by CEN on 6 February 2014.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this
amendment into the relevant national standard without any alteration. Up-to-date lists and bibliographical references concerning such
national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This amendment exists 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1991-1-7:2006/A1:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
1 Modification to 5.3, Principles for design .4
2 Modification to Annex D (informative), Internal explosions .4

Foreword
This document (EN 1991-1-7:2006/A1:2014) has been prepared by Technical Committee CEN/TC 250
“Structural Eurocodes”, the secretariat of which is held by BSI.
This Amendment to the European Standard EN 1991-1-7:2006 shall be given the status of a national
standard, either by publication of an identical text or by endorsement, at the latest by June 2015, and
conflicting national standards shall be withdrawn at the latest by June 2015.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: 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 the United Kingdom.
1 Modification to 5.3, Principles for design
In Paragraph (1), replace the existing Note by the following one:
"
NOTE The National Annex may give the procedures to be used for the types of internal explosions. Guidance on
dealing with the following specific types of explosion is given in Annex D:
– gas and vapour/air explosions in rooms and closed sewage basins;
– dust explosions in rooms, vessels and bunkers;
– gas and vapour/air explosions in road and rail tunnels;
– dust, gas and vapour/air explosions in energy ducts.
The values presented in Annex D of this part may be considered as nominal values given that the explosion
occurs.
When calculating the structural response, dynamic and nonlinear behaviour may be taken into account. A load
duration of 0,2 s may be adopted and damage is acceptable provided it does not lead to disproportional collapse.
The load-time function may be assumed triangular. A sensitivity study on the load-time function should be
performed to identify the peak load time within the 0,2 s duration.".
2 Modification to Annex D (informative), Internal explosions
Replace the existing Annex D with the following one:
"
Annex D
(informative)
Internal explosions
D.1 Natural gas explosions
(1) For buildings which might have piped natural gas installed, or where gas canisters can be present, the
structure may be designed to withstand the effects of an internal natural gas explosion using a nominal
equivalent static pressure given by Formulae (D.1) and (D.2):
p = 3 + p (D.1)
d stat
or
p = 3 + p / 2 + 0,04 / (A / V) (D.2)
d stat v
whichever is the greater;
where
p is the nominal equivalent static pressure to design the structure in [kN/m ];
d
p is the uniformly distributed static pressure at which venting components will fail in [kN/m ];
stat
A
is the area of venting components in [m ];
v
V is the volume of rectangular enclosure in [m ].
Formulae (D.1) and (D.2) are valid for a single room up to 1 000 m total volume.
NOTE 1 The pressure due to deflagration acts effectively simultaneously on all of the bounding surfaces of the
room.
NOTE 2 Multi-room explosions may give much higher pressures. The pressures are difficult to calculate as
they are not simply limited by the strength of the vent panels; therefore, for this type of explosion, the strategy
based on limiting the extend of localized failure (see Figure 3.1) should be adopted.
(2) Where building components with different p values contribute to the venting area, the largest value of
stat
p should be used. No value of p greater than 50 kN/m need be taken into account.
stat d
(3) The ratio of the area of venting components and the volume should comply with Formula (D.3):
−1 −1
0,05 m ≤ A / V ≤ 0,15 m (D.3)
v
NOTE Natural gas is a gaseous fossil fuel consisting primarily of methane but including significant quantities of
ethane, butane, propane, carbon dioxide, nitrogen, helium and hydrogen sulfide. Before natural gas can be used as
a fuel, it undergoes extensive processing to remove almost all materials other than methane.
D.2 Dust explosions in rooms, vessels and bunkers
(1) The design value p for the maximum pressure developed in vented cubic and elongated rooms, vessels
d
and bunkers for dust explosions within a single room may be determined from the empirical Formula (D.4):
−8 -0,569 -0,5 0,753
A = [4,485×10 p K p + 0,027(p – 10)p ]V (D.4)
v max st d stat d
where
A is the venting area [m ];
v
V
is the volume of room, vessel, bunker [m ];
K is the deflagration index of a dust cloud [kN/m ] (see Clause (2));
St
p is the maximum pressure of an explosion of the dust [kN/m ] (see Clause (2));
max
p is the static activation pressure of the vent areas [kN/m ];
stat
p is the design value of the pressure in the vented vessel [kN/m ].
d
(2) Values for p and K may be experimentally determined by standard metho
...