Theory NA en 1995 Enu

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Theoretical Background

National Annexes to EN 1995


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Theoretical Background National Annexes to EN 1995

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Copyright 2012 Nemetschek Scia All rights reserved.


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Table of contents

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Table of contents

Table of contents .............................................................................................................................. iiiVersion Information................................................................................................................................. 1Introduction .............................................................................................................................................. 2National Choice in EN 1995 .................................................................................................................... 3

EN 1995-1-1 ........................................................................................................................................ 3National Annexes .................................................................................................................................... 5

EN 1995-1-1 ........................................................................................................................................ 5Czech Republic .............................................................................................................................. 5Germany ......................................................................................................................................... 5France ............................................................................................................................................ 6Netherlands .................................................................................................................................... 7

Austria ............................................................................................................................................ 9Belgium .......................................................................................................................................... 9Finland ............................................................................................................................................ 9Slovakia ........................................................................................................................................ 10United Kingdom ............................................................................................................................ 10Ireland .......................................................................................................................................... 10Poland .......................................................................................................................................... 11Greece .......................................................................................................................................... 11Slovenia ........................................................................................................................................ 11Romania ....................................................................................................................................... 11Luxembourg ................................................................................................................................. 12


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Version Information

Welcome to the Theoretical Background for National Annexes to EN 1995.

This document provides background information regarding the application of NDP items according todifferent countries.

Version info

Document Title Theoretical Background National Annexes to EN 1995Release 2013.0Revision 12/2012


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Introduction

In this Theoretical background in depth information is given regarding the application of NationalAnnexes to EN 1995 for different countries.

More specifically this concerns the following codes:

Eurocode 5Design of timber structuresPart 1-1: General Common rules and rules for buildingsEN 1995-1-1:2004

Corrigendum EN 1995-1-1:2004/AC:2006

Addendum EN 1995-1-1:2004/A1:2008

The first chapter gives an overview of all NDP articles given in EN 1995 and specifies which of those

articles are supported by Scia Engineer.

The subsequent chapters provide details on the specific implementation of the supported articles fordifferent countries.


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National Choice in EN 1995

This chapter specifies the articles of EN 1995 in which a national choice is allowed. In addition for eacharticle information is given if the article is supported within Scia Engineer.

EN 1995-1-1

Article Commentary

2.3.1.2(2)P The NA may assign actions to load duration classes

No default implementation/Not supported for Scia Engineer

2.3.1.3(1)P The NA may give information on the on the assignment toservice classes


2.4.1(1)P The NA may define the partial factors for material properties

NA data supported in Scia Engineer

6.1.7(2)

(Addendum A1)

The NA may define the crack factor for shear


6.4.3(8) The NA may define the alternative for the greatest stress


7.2(2) The NA may define limiting values of deflections


7.3.3(2) The NA may define limiting frequencies


8.3.1.2(4) The NA may define the application rule for nailed connections


8.3.1.2(7) The NA may define species sensitive to splitting


9.2.4.1(7) The NA may define the method for wall diaphragms


9.2.5.3(1) The NA may define the modification factors


10.9.2(3) The NA may define the value of the maximum bow


10.9.2(4) The NA may define the value of the maximum deviation



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National Annexes

This chapter provides details on the specific implementation of the supported articles for differentcountries. Only those items for which a country differs from the default EN are elaborated. For moreinformation reference is made to the EN code and the respective National Annex documents.

EN 1995-1-1

Czech Republic

According to Czech National annex CSN EN 1995-1-1/NA ed.A:2011-11

Article Commentary

2.4.1(1)P Using the default EN

6.1.7(2)

(Addendum A1)

Using the default EN

6.4.3(8) Eq.(6.54)is set by default

Germany

According to German National annex DIN EN 1995-1-1/NA:2010-12

Article Commentary

2.4.1(1)P The Safety Factors are set as follows:

Gamma MSolid timber = 1,30Gamma MGlued laminated timber = 1,30

Gamma MAccidental combinations = 1,00

6.1.7(2)

(Addendum A1)

When choosing the German DIN-EN NA method the crack factor for shear isdetermined according to the method given in the National Annex:

This method gives the following kcrvalues based on the type of timber:

a) Vollholz aus Nadelholz

Solid timber and name starting with C: kc r = 2,0 / fv,k

With fv ,kin N/mm^2

b) Vollholz aus Laubholz

Any other Solid timber: kcr= 0,67

c) Brettschichtholz

Glued laminated timber: kcr= 2,5 / fv ,k

With fv ,kin N/mm^2

For all cases kcris limited to a maximal value of 1,00.


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6.3.3

(NCCI)

In case the German National Annex is set, the following additional checksaccording to (NA.58) and (NA.59) are executed as NCCI:


France

According to French National annex NF EN 1995-1-1/NA 2010-05

Article Commentary


6.1.7(2)

(Addendum A1)

When choosing the French NF-EN NA method the crack factor for shear isdetermined according to the method given in the National Annex:

This method gives the following kcrvalues based on the type of timber and theservice class set in the Setup:

a) Service Class 1

Solid timber with d > 150 mm: kcr= 0,67

For all other cases kcr= 1,00

b) Service class 2

Solid timber with d > 150 mm: kcr= 0,67

Glued laminated timber: kcr= 0,67(It is thus assumed that the loading ratio is > 0,7)

For all other cases kcr= 1,00

c) Service class 3

In all cases kc r= 0,67

Note: dis defined as the maximal dimension of the section and determined as:

d= max [ (x_maxx_min) ; (y_maxy_min) ]

With : x max Maximal horizontal fiber coordinateof the cross-section

x min Minimal horizontal fiber coordinateof the cross-section

y max Maximal vertical fiber coordinate of


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the cross-section

y min Minimal vertical fiber coordinate ofthe cross-section


Netherlands

According to Dutch National annex NEN-EN 1995-1-1:2005/NB:2011

Article Commentary


6.1.7(2)

(AddendumA1)

When choosing the Dutch NEN-EN NA m ethod the crack factor for shear isdetermined according to the method given in the National Annex:

This method gives the following kc rvalues based on the type of cross-section:

a) For I- and T-sections

kcrdepends on the ratio of the web width bwebto the flange width bf langeasshown on the following picture:

The supported timber sections with corresponding dimensions are given inthe following table:

Cross-section Dimension

bweb= tha

bf lange= Bb

bweb= tha

bf lange= max(Bb ; Bc)

bweb= tha

bf lange= tha + 2 *Bb

In addition also geometric shape types I ng, I ghand T gare supported.


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b) For hollow sections

kcrdepends on the ratio of the web width bwebto the flange width bf langeasshown on the following picture:

The supported timber sections with corresponding dimensions are given inthe following table:

Cross-section Dimensionbweb= 2 * Bb

bf lange= Ba

bweb= 2 * Ba

bf lange= Bb + 2 * Ba

bweb= 3 * Ba

bf lange= 2 * Bb + 3 * Ba

In addition also geometric shape types Oand O asymmetr icare supported.

c) For any other section

kcr= 1,00



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Austria

According to Austrian National annex NORM B 1995-1-1:2010

Article Commentary


6.1.7(2)

(Addendum A1)

When choosing the Au str ian NORM-EN NA m ethod the crackfactor forshear is determined according to the method given in the National Annex:

This method gives the following kcrvalues based on the type of timber:

Solid timber: kcr=0,67

Glued laminated timber: kc r= 0,83

In addition a warning note is printed in case of the following:

Solid timber: in case fv, k 3,1 N/mm^ 2

Glued laminated timber: in case fv, k 3,0 N/mm^ 2


Belgium

According to Belgian National annex NBN EN 1995-1-1-ANB:2012

Article Commentary


6.1.7(2)

(Addendum A1)


6.4.3(8) Eq.(6.55)is set by default, Eq.(6.54)can be set

Finland

According to Finnish National annex SFS EN 1995-1-1 NA

Article Commentary

2.4.1(1)P The Safety Factors are set as follows:

Gamma MSolid timber = 1,40

Gamma MGlued laminated timber = 1,20

Gamma MAccidental combinations = 1,00

6.1.7(2)

(Addendum A1)


6.4.3(8) Eq.(6.55)is set by default, Eq.(6.54)can be set


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Slovakia

According to Slovak National annex STN EN 1995-1-1 + A1/NA: 2008

Article Commentary


6.1.7(2)

(Addendum A1)



United Kingdom

According to British National annex BS EN 1995-1-1+A1/N1: 2009

Article Commentary


6.1.7(2)

(Addendum A1)



Ireland

According to Irish National annex I.S. EN 1995-1-1/NA: 2004

Article Commentary


6.1.7(2)

(Addendum A1)




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Poland

According to Polish National annex PN-EN 1995-1-1:2010

Article Commentary


6.1.7(2)

(Addendum A1)



Greece

According to Greek National annex ELOT 1495-1-1:2009

Article Commentary


6.1.7(2)

(Addendum A1)



Slovenia

According to Slovenian National annex SIST EN 1995-1-1:2005/A101:2006

Article Commentary


6.1.7(2)

(Addendum A1)



Romania

According to Romanian National annex SR EN 1995-1-1:2004/NB:2008

Article Commentary


6.1.7(2)

(Addendum A1)




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Luxembourg

According to Luxembourgian National annex EN1995-1-1:2004/AN-LU:2011

Article Commentary


6.1.7(2)

(Addendum A1)


(No information is given so the default is used)


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Theory NA en 1995 Enu