Eurocode 1 - Actions on structures - Part 1-7: General actions - Accidental actions

EN 1991-1-7 provides strategies and rules for safeguarding buildings and other civil engineering works against identifiable and unidentifiable accidental actions. EN 1991-1-7 defines: - strategies based on identified accidental actions, - strategies based on limiting the extent of localised failure. The following subjects are dealt with in this part of EN 1991: - definitions and symbols (Section 1); - classification of actions (Section 2); - design situations (Section 3); - impact (Section 4); - explosions (Section 5); - design for consequences of localised failure in buildings from an unspecified cause (informative Annex A); - information on risk assessment (informative Annex B); - dynamic design for impact (informative Annex C); - internal explosions (informative Annex D). Rules on dust explosions in silos are given in EN 1991-4. Rules on impact from vehicles travelling on the bridge deck are given in EN 1991-2. EN 1991-1-7 does not specifically deal with accidental actions caused by external explosions, warfare and terrorist activities, or the residual stability of buildings or other civil engineering works damaged by seismic action or fire, etc.

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

Evrokod 1: Vplivi na konstrukcije -1-7. del: Splošni vplivi - Nezgodni vplivi

EN 1991-1-7 podaja strategije in pravila za varovanje stavb in drugih gradbenih inženirskih objektov pred znanimi in neznanimi nezgodnimi vplivi. EN 1991-1-7 določa:
– strategije na podlagi znanih nezgodnih vplivov,
– strategije na podlagi omejevanja obsega lokalne odpovedi.
Vsebina tega dela EN 1991 je naslednja:
– definicije in simboli (1. poglavje);
– razvrstitev vplivov (2. poglavje);
– projektna stanja (3. poglavje);
– trčenja (4. poglavje);
– eksplozije (5. poglavje);
– projektiranje za posledice lokalne odpovedi v stavbah zaradi neznanega vzroka (informativni
dodatek A);
– podatki o oceni tveganja (informativni dodatek B);
– dinamično projektiranje pri trčenjih (informativni dodatek C);
– notranje eksplozije (informativni dodatek D).
Pravila o prašnih eksplozijah v silosih so dana v EN 1991-4. Pravila o trčenjih vozil na mostovih so dana v EN 1991-2. EN 1991-1-7 ne vsebuje posebnih določil za vplive zunanjih eksplozij, vojaških in terorističnih dejavnosti ter za preostale stabilnosti stavb ali drugih gradbenih inženirskih objektov, poškodovanih pri potresu, požaru itd.

General Information

Status
Published
Public Enquiry End Date
30-Dec-2013
Publication Date
30-Jun-2014
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
27-May-2014
Due Date
01-Aug-2014
Completion Date
01-Jul-2014

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SLOVENSKI STANDARD
SIST EN 1991-1-7:2006/A1:2014
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
SIST EN 1991-1-7:2006/A1:2014 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 1991-1-7:2006/A1:2014
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SIST EN 1991-1-7:2006/A1:2014
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.
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SIST EN 1991-1-7:2006/A1:2014
EN 1991-1-7:2006/A1:2014 (E)
Contents Page

Foreword ..............................................................................................................................................................3

1 Modification to 5.3, Principles for design ...........................................................................................4

2 Modification to Annex D (informative), Internal explosions ...............................................................4

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SIST EN 1991-1-7:2006/A1:2014
EN 1991-1-7:2006/A1:2014 (E)
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.

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SIST EN 1991-1-7:2006/A1:2014
EN 1991-1-7:2006/A1:2014 (E)
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:
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SIST EN 1991-1-7:2006/A1:2014
EN 1991-1-7:2006/A1:2014 (E)
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
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 ];

p is the uniformly distributed static pressure at which venting components will fail in [kN/m ];

stat
is the area of venting components in [m ];
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)

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

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
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SIST EN 1991-1-7:2006/A1:2014
EN 1991-1-7:2006/A1:2014 (E)
where
A is the venting area [m ];
is the volume of room, vessel, bunker [m ];
K is the deflagration index of a dust cloud [kN/m ] (see Clause (2));
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 ].
(2) Values for p and K may be experimentally determined by standard metho
...

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