United Kingdom of Great Britain and Northern Ireland ≠ EDICT OF GOVERNMENT ± In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. BS NA EN 1996-1-2 (2005) (English): UK National Annex to Eurocode 6. Design of masonry structures. General rules. Structural fire design Nulli vendemus, nulli negabimus aut differemus Rectum aut Justiciam. We will sell to no man, we will not deny or defer to any man either Justice or Right. MAGNA CARTA (1297) NA to BS EN 1996-1-2:2005 NATIONAL ANNEX UK National Annex to Eurocode 6: Design of masonry structures - Part 1-2: General rules - Structural fire design res 13.220.50; 91.010.30; 91.080.30 British Standards NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITIED BY COPYRIGHT LAW NA to BS EN 1996-1-2:2005 Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was last issued. © BSI 2007 ISBN 978 0 580 497844 The following BSI references relate to the work on this standard: Committee reference B/525/6 Draft for comment 06/30128382 DC Publication history First published May 2007 Amendments issued since publication Amd. no. Date Text affected NA to BS EN 1996-1-2:2005 National Annex (inforDlative) to BS EN 1996-1-2:2005, Eurocode 6: Design of Inasonry structures - Part 1-2: General rules Structural fire design Introduction This National Annex has been prepared by BSI Subcommittee B/525/6, Use of masonry. It is to be used in conjunction with BS EN 1996-1-2:2005. NA.l Scope This National Annex gives: a) decisions for the Nationally Determined Parameters described in the following sub clauses of BS EN 1996-1-2:2005: 2.2(2) actions; 2.3(2) design value of material properties; 2.4.2(3) member analysis; 3.3.3.1(1) thermal elongation; 3.3.3.2( 1) specific heat capacity; 3.3.3.3 thermal conductivity; 4.5(3) assessment by tabulated data; Annex B values of tF and IF. b) decisions on the use of informative Annexes A, C, D and E; c) references to non-contradictory complementary information to assist the user to apply BS EN 1996-1-2:2005 (see NA.4). NA.2 Nationally Determined Parameters NOTE NO' values are givenfor the symbals in clauses NA.2.1 to' NA.2. 7, as the calculation methads given in Annexes C and D will not be used in the UK. In the event that a calculatian methad becames available in a non-cantradictory camplementary publicatian, the recammended values for the symbals given in the relevant nates in BS EN 1996-1-2 may be cansidered to' be acceptable far use. NA.2.1 Actions [see BS EN 1996-1-2:2005, 2.2(2)] The value of t;u, the emissivity of a masonry surface: nvg NA.2.2 Design values for material properties [see BS EN 1996-1-2:2005,2.3(2)] 'YM,fi for thermal properties for the fire situation: nvg 'YM,fi for mechanical properties for the fire situation: nvg © BSI 2007 • 1 NA to BS EN 1996-1-2:2005 NA.2.3 Member analysis [see BS EN 1996-1-2:2005, 2.4.2(3)] YG' the partial factor for permanent actions: nvg YQ,l' the partial factor for variable action 1: nvg NA.2.4 Thermal elongation [see BS EN 1996-1-2:2005, 3.3.3.1(1)] The values for &r (%0), the variation of the thermal elongation with temperature: nvg NA.2.5 Specific heat capacity [see BS EN 1996-1-2:2005, 3.3.3.2(1)] The values for ca' the specific heat capacity with temperature: nvg NA.2.6 Thermal conductivity [see BS EN 1996-1-2:2005, 3.3.3.3] The values for Aa, the thermal conductivity with temperature: nvg NA.2.7 Assessment by tabulated data [see BS EN 1996-1-2:2005, 4.5(3)] The values for YGlo: nvg NOTE No value ofYGlo is given, as it is only needed whenfire tests are to be performed, or eX'isting fire tests have to be interpreted. A value may be assessed from the NA to BS EN 1996-1-1 :2005, Tables NA.1 and NA.2 (r~ and the NA to BS EN 1990:2002, Table NA.A1.2 (noting that yFis given there in terms ofYGand rQ' as applied to dead and imposed loads respecUvely). In arriving at the values of tF and IF in NA. 3, account has been taken of the global safety factor applicable to the fire test data that was u..')ed to fmmulate the tables. The tables applicable to a = 0.6 may be used when the verification of vertical load capacity indicates that only up to 0.6 of the permitted design vertical load resistance is being used. a = 1.0 should be used when 1nOre than 0.6 of the permitted capacity is being used. NA.3 Annex B - Tabulated values of fire resistance of masonry walls (values oftF and 'F) [see BS EN 1996-1-2:2005, Annex B, Note 4] NOTE The values chosen are presented in tabular form and, for ease of use, each table retains the numbering of its counterpart in BS EN 19.96-1-2:2005, Annex' B. Those tables in that document that are not relevant are not given in this National Annex. 2 • © BSI 2007 NA to BS EN 1996-1-2:2005 NA.3.1 Clay masonry [see BS EN 1996-1-2:2005, Table N.B.1.1] The values in respect of N. B.1.l are as given in Table NA.l.l Table NA.l.l Clay masonry minimum thickness of separating non-Ioadbearing walls (criteria EI) for fire resistance classifications Row No. Material Minimum wall thickness, in rnrn, tF for fire resistance classification EI for time properties: (minutes) tfl,d gross density, 30 60 90 120 180 240 p [kg/m3] 1.S Group 1 S units 1.S.1 Mortar: general purpose, thin layer, lightweight p?- 1 200 1.S 1.1 65 65 90 100 170 170 1.S 1.2 (65) (65) (90) (100) (100) (140) 1. Group 1 units 1.1 Mortar: general purpose, thin layer, lightweight p?- 1 000 1.1.1 65 100 100 100 170 200 1.1.2 (65) (65) (90) (100) (140) (170) 2.1 Mortar: general purpose, thin layer, lightweight p?- 700 25% < perforation ~ 40% 2.1.1 100 130 215 215 240 240 2.1.2 (100) (130) (215) (215) (215) (240) © BSI 2007 • 3 NA to BS EN 1996-1-2:2005 NA.3.2 Clay masonry [see BS EN 1996-1-2:2005, Table N.B.1.2] The values in respect of N.B.1.2 are as given in Table NA.1.2 Table NA.l.2 Clay masonry minimum thickness of separating loadbearing single-leaf walls (criteria REI) for fire resistance classifications Row No. Material properties: Minimum wall thickness, in mm, tF for rITe resistance classification REI gross density, p [kg/m3] for time (minutes) tfi,d 30 60 90 120 180 240 IS Group IS units 1S.1 Mortar: general purpose, thin layer p~ 1 200 IS.1.1 90 90 100 100 170 170 a::::; 1,0 1S.1.2 (90) (90) (90) (100) (140) (140) 1S.1.3 90 90 100 100 170 170 a::::; 0,6 1S.1.4 (90) (90) (90) (100) (100) (140) 1 Group 1 units Mortar: general purpose, thin layer 1.2 p 1000 1.2.1 100 100 100 140 200 200 a::::; 1,0 1.2.2 (90) (100) (100) (100) (170) (170) 1.2.3 90 100 100 140 170 200 a::::; 0,6 1.2.4 (90) (90) (100) (100) (140) (170) 2 Group 2 units 2.1 Mortar: general purpose, thin layer p> 700 25% < perforation::::; 40% 2.1.1 100 130 215 215 240 240 a::::; 1,0 2.1.2 (100) (130) (215) (215) (215) (240) 2.1.3 100 130 215 215 240 240 a::::; 0,6 2.1.4 (100) (130) (215) (215) (215) (240) 4 • © BSI 2007 NA to BS EN 1996-1-2:2005 NA.3.3 Clay masonry [see BS EN 1996-1-2, Table N.B.1.6] The values in respect of N.B.I.6 are as given in Table NA.I.6. The tabulated thicknesses are for the loaded leaf of a cavity wall where the loaded leaf is subjected to fire. The non-loaded leaf may be of a dissimilar masonry material to the loaded leaf, but should otherwise conform to the relevant masonry materials specification. In such cases, the respective thickness of each leaf of the cavity wall, relevant to masonry unit and mortar, should be that as specified in the appropriate materials specification table. Table NA.l.6 Clay masonry minimum thickness of each leaf of separating loadbearing cavity walls with one leaf loaded (criteria REI) for fire resistance classifications Row no. Material properties: Minimum wall thickness, in mm, tF for lIre resistance classification REI gross density, p [kglrn3] for time (minutes) tfi,d 30 60 90 120 180 240 and Group 1 units 1S.1 Mortar: general purpose, thin layer p?;:; 1000 1S.1.1 90 90 100 100 170 170 1S.1.2 a~ 1,0 (90) (90) (90) (100) (140) (140) 1S.1.3 90 90 100 100 170 170 1S.1.4 a~ 0,6 (90) (90) (90) (l00) (140) (140) units 2.1 Mortar: general purpose, thin layer p~ 700 25% < perforation ~ 40% 2.1.1 100 130 215 215 240 240 2.1.2 a~ 1,0 (100) (130) (215) (215) (240) (240) 2.1.3 100 130 215 215 240 240 a 0,6 2.1.4 (100) (130) (215) (215) (240) (240) © BSI 2007 • 5 NA to BS EN 1996-1-2:2005 NA.3.4 Calcium silicate masonry [see BS EN 1996-1-2:2005, Table N.B.2.1] The values in respect of N.B.2.1 are as given in Table NA.2.1 Table NA.2.1 Calcium silicate masonry minimum thickness of separating non- loadbearing walls (criteria EI) for lIre resistance classifications Row No. Material properties: Minimum wall thickness, in nun, t for rue resistance classification EI f gross density, p [kg/m3] for time (minutes) tfi,d 30 60 90 120 180 240 1 8 Group 1 8.1 Mortar : general purpose P?3 1600 1 8.1.1 65 65 90 100 170 170 1.8 1.2 (65) (65) (90) (100) (100) (140) Group 1 1.2 Mortar: general purpose, thin layer P~ 1000 1.2.1 65 100 100 100 170 200 1.2.2 (65) (65) (90) (100) (140) (170) NA.3.5 Calcium silicate masonry [see BS EN 1996-1-2:2005, Table N.B.2.2] The values in respect of N.B.2.2 are as given in Table NA.2.2 Table NA.2.2 Calcium silicate masonry minimum thickness of separating loadbearing single-leaf walls (criteria REI) for fire resistance classifications Row Material properties Minimum wall thickness, in nun, tF for fire resistance classification REI Number gross density, P [kg/m:3] for time (minutes) tfi,d 30 60 90 120 180 240 18 Group units 18.1 Mortar: general purpose, thin layer P ~ 1600 18.1.1 90 90 100 100 190 190 18.1.2 a~ 1,0 (90) (90) (90) (l00) (140) (190) 18.1.3 90 90 100 100 170 190 18.1.4 a~0,6 (90) (90) (90) (100) (100) (190) 1 Group 1 units 1.1 Mortar: general purpose, thin layer p?3 1 000 1.1.1 100 100 100 190 200 200 1.1.2 a~ 1,0 (90) (l00) (100) (100) (170) (170) 1.1.3 90 100 100 170 190 200 1.1.4 a~ 0,6 (90) (90) (l00) (100) (170) (170) 6 • © B8I 2007