1、December 2010 Translation by DIN-Sprachendienst.English price group 8No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 91.010.30!$lhX“1736953www.din.deDDIN EN 1991-1-3/NANationaler Anhang Annexe national Together with supersedesDIN 1055-5:2005-07www.beuth.deDocument comprises 11 pagesIn case of doubt, the German-language original shall be considered authoritative.DIN EN 1991-1-3:2010-12Nationally determined parame
3、ters Eurocode 1: Actions on structures Part 1-3: General actions Snow loads English translation of DIN EN 1991-1-3/NA:2010-12 National festgelegte Parameter Eurocode 1: Einwirkungen auf Tragwerke Teil 1-3: Allgemeine Einwirkungen Schneelasten Englische bersetzung von DIN EN 1991-1-3/NA:2010-12 Param
4、tres dtermins au plan national Eurocode 1: Actions sur les structures Partie 1-3: Actions gnrales Charges de neige Traduction anglaise de DIN EN 1991-1-3/NA:2010-12 National Annex 02.12 DIN EN 1991-1-3/NA:2010-12 2 A comma is used as the decimal marker. Foreword This document has been prepared by Wo
5、rking Committee NA 005-51-02 AA Einwirkungen auf Bauten (Sp CEN/TC 250/SC 1) of the Normenausschuss Bauwesen (Building and Civil Engineering Standards Committee). This document is the National Annex to DIN EN 1991-1-3:2010-12; Eurocode 1: Actions on structures Part 1-3: General actions Snow loads. E
6、uropean Standard EN 1991-1-3 allows national safety parameters, referred to as Nationally Determined Parameters (NDPs), to be specified for a number of points. The NDPs cover alternative verification methods, the provision of individual values and the selection of classes from designated classificat
7、ion systems. The relevant parts of the text are identified in the European Standard by references to the possibility of national choice and are listed in Clause NA.2.1. This National Annex also includes non-contradictory complementary information (NCI) for the application of DIN EN 1991-1-3:2010-12.
8、 This National Annex is an integral part of DIN EN 1991-1-3:2010-12. DIN EN 1991-1-3:2010-12 and this National Annex DIN EN 1991-1-3/NA:2010-12 supersede DIN 1055-5:2005-07. Amendments This document differs from DIN 1055-5:2005-07 as follows: a) provisions of DIN 1055-5:2005-07 relevant to the natio
9、nal application of DIN EN 1991-1-3 have been incorporated; b) Subclause 5.3.6 (1) has been revised taking into account the complementary national rules from DIN 1055-5. Previous editions DIN 1055-5: 1936xx-12, 1975-06, 2005-07 DIN 1055-5/A1: 1994-04 DIN EN 1991-1-3/NA:2010-12 3 NA 1 Scope This Natio
10、nal Annex contains national provisions relating to the underlying principles behind the determination of snow loads for the calculation and design of buildings and civil engineering works, that are to be taken into consideration when applying DIN EN 1991-1-3:2010-12 in Germany. This National Annex i
11、s only valid in conjunction with DIN EN 1991-1-3:2010-12. NA 2 National provisions for application of DIN EN 1991-1-3:2010-12 NA 2.1 General DIN EN 1991-1-3:2010-12 refers to the option of choosing Nationally Determined Parameters (NDPs) in the following places in the text: 1.1(2), 1.1(4) 2(3), 2(4)
12、 3.3(1), 3.3(3) 4.1(1), 4.2(1), 4.3(1) 5.2(1), 5.2(4), 5.2(5), 5.2(6), 5.2(7), 5.2.(8), 5.3.3(4), 5.3.4(3), 5.3.4(4), 5.3.5(1), 5.3.5(3), 5.3.6(1), 5.3.6(3) 6.2(2), 6.3(1), 6.3(2) A(1) (in Table A.1) In addition, NA 2.2 includes non-contradictory complementary information for the application of DIN
13、EN 1991-1-3:2010-12. This information is preceded by the letters “NCI”. 6.4(1) NA 2.2 National provisions In the following, clauses are numbered as in DIN EN 1991-1-3:2010-12. 1 General 1.1 Scope NDP re 1.1(2) For structures at altitudes above 1 500 m, reference values shall be specified by the resp
14、onsible authority on a case-by-case basis. NDP re 1.1(4) Annex B is not to be applied in Germany. NOTE The term “exceptional snow drifts” used in the title of Annex B does not relate to design situations according to DIN EN 1990:2002-10, 4.1.1(2). DIN EN 1991-1-3/NA:2010-12 4 2 Classification of act
15、ions NDP re 2(3) See NDP re 4.3(1). NDP re 2(4) According to this National Annex snow drifts are not accidental actions. The upper and lower restriction of snow drifts using the exceptional snow load approach according to 4.3 is dealt with in the NDP re 5.3.6(1). 3 Design situations 3.3 Exceptional
16、conditions NDP re 3.3(1) Where the responsible authorities specify local exceptional snow loads (see national provisions re 4.3(1), the particular local effects according to Section 6 of the standard shall be based on the design situation according to 3.3(1) (referred to as Case B1 in Annex A). NDP
17、re 3.3(3) See NDP re 1.1.(4) and 5.3.6(1). 4 Snow load on the ground 4.1 Characteristic values NDP re 4.1(1) Snow load on the ground. DIN EN 1991-1-3/NA:2010-12 5 Figure NA.1 Snow load map for Germany DIN EN 1991-1-3/NA:2010-12 6 The responsible authorities are to be consulted regarding the precise
18、assignment of administrative units into the snow load zones in Figure NA.1, particularly at interzonal boundaries. In zones 1 to 3, the characteristic values of the snow loads on the ground shall be obtained from Equations (NA.1) to (NA.3) as a function of the snow load zone and the height of the gr
19、ound above sea level. The characteristic values in zones 1a and 2a are obtained by multiplying the values from zones 1 and 2 by the factor 1,25. The basic quantities (see Figure NA.2) are increased in the same way. Zone 1: 2k76014091,019,0 +=As (NA.1) Zone 2: 2k76014091,125,0 +=As (NA.2) Zone 3: 2k7
20、6014091,231,0 +=As (NA.3) where skis the characteristic value of the snow load on the ground, in kN/m2; A is the height of the ground above sea level, in m. Key Basic quantities (minimum values): 1 Zone 1 Zone 1 0,65 kN/m2(up to 400 m above sea level) 2 Zone 2 Zone 2 0,85 kN/m2(up to 285 m above sea
21、 level) 3 Zone 3 Zone 3 1,10 kN/m2(up to 255 m above sea level) Figure NA.2 Characteristic values of snow loads, sk, on the ground DIN EN 1991-1-3/NA:2010-12 7 In certain locations within snow load zone 3, snow loads higher than those obtained by means of Equation (NA.3) can occur. The local authori
22、ties shall be consulted for information on the snow load in these locations. Examples of such locations are: the upper Harz mountains; higher regions of the Fichtelgebirge; Reit im Winkl; Obernach (Walchensee). 4.2 Other representative values NDP re 4.2(1) The recommended values apply. 4.3 Treatment
23、 of exceptional snow loads on the ground NDP re 4.3(1) In the North German Lowland there have been rare cases of snow loads exceeding the design values severalfold. The responsible authorities can determine the reference values in the affected regions. These shall be considered as additional, accide
24、ntal, actions for the purposes of DIN EN 1990. 5 Snow load on roofs 5.2 Load arrangements NDP re 5.2(1) See NDP re 1.1(4). NDP re 5.2(4) There are no further national provisions. NDP re 5.2(5) There are no further national provisions. NDP re 5.2(6) There are no further national provisions. NDP re 5.
25、2(7) The recommended value Ce= 1,0 applies. NDP re 5.2(8) The recommended value Ct= 1,0 applies. DIN EN 1991-1-3/NA:2010-12 8 5.3 Roof shape coefficients 5.3.3 Pitched roofs NDP re 5.3.3 (4) The provisions of DIN EN 1991-1-3 apply. 5.3.4 Multi-span roofs NDP re 5.3.4(3) See national provision re 1.1
26、 (4). NCI re 5.3.4(4) The shape coefficients for multi-span roofs shall be taken from Figure 5.1 or Table 5.1 of DIN EN 1991-1-3:2010-12, depending on the pitch of the roof. However, instead of using the shape coefficients according to DIN EN 1991-1-3:2010-12, Figure 5.4 the shape coefficients from
27、Figure NA.3 are to be applied. The shape coefficient 2(see Table 5.1) may be limited to 1k+sh. where is the unit weight of snow that can be assumed to the nearest 2 kN/m3for the purpose of this calculation; h is the elevation of the ridge above the eaves, in m; skis the characteristic snow load, in
28、kN/m2. NOTE The snow load on near-vertical windows or on adjacent components can be determined by analogy with 6.4. DIN EN 1991-1-3/NA:2010-12 9 The average angle of inclination ( )215,0 += shall be used for the inner bays. a) Ribbon windows at an angle b) Perpendicular ribbon windows Figure NA.3 Sh
29、ape coefficients for multi-span monopitch and pitched roofs 5.3.5 Cylindrical roofs NDP re 5.3.5(1), Note 1 The recommended values apply. NDP re 5.3.5(1), Note 2 There are no further national provisions. DIN EN 1991-1-3/NA:2010-12 10 5.3.6 Roof abutting and close to taller construction works NDP re
30、5.3.6(1), Note 1 wis to be taken into account where roofs abut to taller construction works and the difference in height is h 0,5 m. It need not be assumed to be greater than the following: skw =sh(NA.4) For the sum of w+ S, the following applies: 4,28,0sw+ (NA.5) The following restriction applies t
31、o canopies that are open at the sides (with b2 3 m) and can be accessed for snow removal: 28,0sw+ (NA.6) In the Alpine region according to DIN EN 1991-1-3:2010-12, Figure C.2, the following upper restriction applies to snow loads sk 3,0 kN/m2: 0,9ksw45,62,1s+ (NA.7) For accidental actions in the Nor
32、rh German Lowland, the following generally applies: 4swesl+ C (NA.8) sneed not be considered in cases where snow guards or comparable equipment are fitted. NDP re 5.3.6(1), Note 2 The recommended values apply. NDP re 5.3.6(3) See NDP re 1.1(4). 6 Local effects 6.2 Drifting at projections and obstruc
33、tions NDP re 6.2(2) See NDP re 1.1(4). 6.3 Snow overhanging the edge of a roof NDP re 6.3(1) Consideration of the cantilevered parts of a roof to determine the load on the eaves is to be carried out irrespective of the elevation of the site. DIN EN 1991-1-3/NA:2010-12 11 NDP re 6.3(2) A reduced coef
34、ficient k of 0,4 to take into account the shape of the overhanging snow may be used in Germany. If snow guards or comparable equipment are distributed over the surface of the roof and these effectively prevent the snow from sliding down, and if these are calculated as in 6.4, the approach using the
35、line load need not be used. 6.4 Snow loads on snow guards and other obstacles NCI re 6.4(1) Complementary information: If snow guards are used to reduce snow loads on the structure (e.g. loads from snow sliding down onto lower roofs (see 4.2.7), or if other obstacles are installed on the roof that c
36、ause sliding snow to pile up, a snow load (Fsper m length) as shown in Figure NA.4 shall be assumed. Figure NA.4 Snow loads on snow guards Annex A (informative) Design situations and load arrangements to be used for different locations NDP re Annex A: See NDP re 1.1(4) und 4.3(1). According to the national provisions re 1.1(4), 2(4) and 4.3(1), only Case B1, for exceptional conditions, applies. There are no provisions for Cases B2 and B3.
